# Designing an Efficient Dairy Milking Parlor for Udder Health ## Key Takeaways - Parlor design directly influences mastitis incidence by controlling opportunities for bacterial entry; a clean, consistent, and gentle milking routine is paramount, supported by adequate visibility, easy access for preparation, and effective cleaning systems to minimize environmental bacterial load. - Vacuum system stability is critical; fluctuating vacuum levels, often due to inadequate reserve capacity (35-45 L/min per unit for high-line systems), can cause teat end damage and facilitate bacterial ingress into the teat canal. - Cow flow and entry design are vital for hygiene; one-way traffic, non-slip flooring, and adequately sized holding areas (1.4-1.9 sq m per cow) reduce stress and manure contamination of udders prior to milking. - Milking routine adherence, particularly the five-step process (fore-stripping, pre-dipping, 30-second contact time, drying, unit attachment), is essential, with parlor layout supporting convenient access to supplies like single-use paper towels and disinfectants. - Environmental control through positive airflow at cow level and humidity management is crucial, as heat stress and high humidity compromise immune function and increase bacterial survival, respectively. --- This guide covers the full process of planning, designing, and evaluating a dairy milking parlor with udder health as the primary design driver. It is written for dairy producers planning a new facility, renovating an existing parlor, or troubleshooting mastitis problems that may be linked to parlor layout and function. The content addresses parlor types, cow flow, milking routine, cleaning systems, ventilation, and the key decisions that affect both efficiency and infection risk. ## At a Glance | Decision Point | Best Practice | Why It Matters | |---|---|---| | Parlor type | Parallel for high throughput, herringbone for flexibility, rotary for very large herds | Layout determines cow flow, worker access, and udder preparation consistency | | Cow flow | One-way traffic, no dead ends, non-slip flooring | Reduces stress and the chance of manure contamination before milking | | Milking routine | Consistent teat preparation with adequate contact time | Prevents new infections and reduces milking time | | Vacuum system | Stable vacuum with sufficient reserve capacity | Fluctuating vacuum causes teat damage and mastitis | | Cleaning | Clean-in-place system sized for the pipework | Poor cleaning spreads bacteria between cows | | Ventilation | Positive airflow at cow level in the parlor | Reduces heat stress and bacterial load | | Recording | Per-cow mastitis and [somatic cell](/blog/guides/somatic-cell) count records | Lets you identify problem cows and equipment faults early | ## Understanding the Link Between Parlor Design and Udder Health Milking parlor design is not just about moving cows through quickly. The physical layout, the materials, the vacuum system, and the daily routine all interact to determine how many new infections occur each month. Mastitis is a disease of opportunity. Bacteria enter the teat canal when the sphincter is open, when the teat end is damaged, or when contaminated material is forced into the canal. A well designed parlor reduces all three of those opportunities. The most important principle is that the parlor should support a clean, consistent, and gentle milking routine. Every cow should be milked the same way every time. If the parlor makes it difficult for the milker to reach the udder, to see the teats clearly, or to move between cows quickly, the routine will break down. That breakdown is where new infections start. The second principle is that the parlor must be easy to clean. Milk residue, manure, and bedding material that accumulate in the parlor provide a food source for bacteria. If surfaces are porous, cracked, or hard to reach, cleaning becomes inconsistent. The bacteria load in the environment rises, and the risk of contamination during milking rises with it. The third principle is that the parlor must protect the cow from physical stress. Stress hormones affect immune function. Cows that are frightened, slipping, or fighting the milking routine have reduced resistance to infection. The parlor design should make the cow feel secure and should not force her into sudden movements or uncomfortable positions. ## Choosing Between Herringbone and Parallel Parlors The two most common parlor types for mid-sized dairy operations are the herringbone and the parallel. Both have been in use for decades, and both can be designed to support excellent udder health. The choice depends on your herd size, your labor situation, and your personal preference for milking routine. ### Herringbone Parlors In a herringbone parlor, cows stand at an angle of about 30 to 45 degrees to the operator pit. The cow enters the stall, and the rear of the cow is close to the pit. The milker has access to the udder from the side and slightly behind. Herringbone parlors offer good visibility of the udder and teats. The milker can see the teat ends clearly and can observe the milk flow. This makes it easier to detect abnormal milk, damaged teats, or cows that are slow to let down. The angled position also gives the milker good access for teat preparation. The main disadvantage of the herringbone is that the cow stands at an angle, which can make it slightly harder for some cows to enter and exit comfortably. The stalls are narrower at the front than at the rear, and cows that are wide or nervous may hesitate. The herringbone also requires a slightly wider building than a parallel parlor for the same number of stalls. For udder health, the herringbone has one significant advantage: the milker can see the teats clearly and can ensure that each teat is properly cleaned and dried before the unit is attached. The milker can also watch for signs of teat damage or irritation during milking. ### Parallel Parlors In a parallel parlor, cows stand side by side, perpendicular to the operator pit. The cow enters the stall and faces away from the pit. The rear of the cow is directly in front of the milker, and the udder is presented between the hind legs. Parallel parlors are more compact than herringbones. For the same building width, you can fit more stalls in a parallel parlor. This makes them popular for larger herds where throughput is the priority. The parallel design also provides very good rear access to the udder, and many milkers find it easier to attach units from directly behind. The main disadvantage of the parallel parlor is that visibility of the teats is reduced. The milker sees the udder from behind, and the teats are partially obscured by the hind legs. This makes it harder to detect subtle changes in teat condition or milk appearance. Some producers address this with mirrors or cameras, but these are not as effective as direct vision. For udder health, the parallel parlor requires a more disciplined milking routine. Because visibility is reduced, the milker must rely on touch and on consistent procedure to ensure that each cow is properly prepared. If the routine is followed strictly, a parallel parlor can achieve mastitis rates as low as any other design. If the routine is rushed, problems can go unnoticed. ### Decision Thresholds Use the following thresholds to guide your choice: - Herds under 150 cows: A herringbone parlor is often the better choice. The lower throughput requirement means you can afford the extra time per cow that good teat preparation requires. The better visibility supports a careful milking routine. - Herds between 150 and 400 cows: Either design can work. Choose based on labor availability and building constraints. If you have experienced milkers who follow a strict routine, a parallel parlor will serve you well. If you have high staff turnover or less experienced milkers, the herringbone provides more visual feedback. - Herds over 400 cows: A parallel parlor or a rotary parlor is usually necessary to achieve the required throughput. At this scale, udder health depends on a well designed milking routine and rigorous monitoring, not on the parlor type alone. ### Rotary Parlors Rotary parlors are an option for herds over 400 cows. The cows stand on a rotating platform, and the milker works from a fixed position as the platform moves past. Rotary parlors offer the highest throughput per worker of any parlor type. For udder health, rotary parlors have both advantages and disadvantages. The consistent position of each cow relative to the milker supports a standardized routine. The milker sees every cow from the same angle, which makes it easier to spot abnormalities. However, the platform moves continuously, and the milker has a limited time window to complete teat preparation and unit attachment. If the routine falls behind, cows can be milked with inadequate preparation. Rotary parlors require a high level of organization and a well trained crew. They are not a good choice for a producer who is not prepared to invest in staff training and standard operating procedures. ## Cow Flow and Entry Design The way cows enter and exit the parlor has a direct effect on udder health. Cows that are stressed or hurried during entry are more likely to defecate in the holding area and in the parlor itself. Manure on the udder and teats increases the risk of contamination during milking. ### Holding Area Design The holding area should be large enough to hold the entire group that will be milked in one session. A general rule is to allow 1.4 to 1.9 square meters (15 to 20 square feet) per cow. The floor should be non-slip and should be cleaned regularly. If the holding area is dirty, the cows will carry manure into the parlor on their feet and legs. The holding area should have good ventilation. Cows that are crowded and hot will pant and sweat, which increases the humidity in the parlor and raises the bacterial load in the air. In hot climates, consider installing fans and sprinklers in the holding area to cool the cows before they enter the parlor. ### Entry Lanes The entry lane should be wide enough for the largest cow in the herd to pass comfortably. A lane that is too narrow will cause cows to hesitate and bunch up. This creates a bottleneck and increases stress. The entry lane should be straight, or nearly straight, with no sharp turns. Cows prefer to move in a straight line. A sharp turn at the entry to the parlor will cause some cows to balk, especially if they cannot see where they are going. ### One-Way Traffic The parlor should be designed for one-way traffic. Cows enter at one end and exit at the other. There should be no opportunity for a cow to turn around and walk back through the parlor. This is not just an efficiency issue. A cow that reverses direction in the parlor can bump into other cows, knock over milking units, and create chaos that stresses the entire group. The exit lane should be wide enough for cows to leave quickly and should lead directly to a feed area or a well lit holding pen. Cows that can see a reward at the exit are more willing to move through the parlor. ### Non-Slip Flooring Slipping is a major source of stress and injury in the milking parlor. A cow that slips on a wet floor will be nervous for the rest of the milking session. She may not let down milk fully, which increases the risk of incomplete milking and new infections. The parlor floor should have a textured surface that provides grip even when wet. Grooved or broom-finished concrete is the standard choice. Rubber flooring mats are also available and provide excellent grip, but they must be cleaned regularly to prevent the buildup of bacteria. ## Parlor Dimensions and Worker Access The physical dimensions of the parlor determine how easily the milker can reach the udder and perform the milking routine. A parlor that is too cramped forces the milker into awkward positions, which leads to rushed work and inconsistent preparation. ### Operator Pit Depth The operator pit should be at a depth that allows the milker to work with a straight back. For most people, a pit depth of 76 to 86 centimeters (30 to 34 inches) below the cow standing level is comfortable. The exact depth depends on the height of the milker. A pit that is too deep or too shallow will cause back strain and will make it harder to see and reach the teats. If you have milkers of significantly different heights, consider installing an adjustable platform in the pit. This is a simple addition that can prevent chronic back problems in your staff. ### Stall Width and Length Stall width should be at least 76 centimeters (30 inches) for a herringbone parlor and 66 to 71 centimeters (26 to 28 inches) for a parallel parlor. Cows that are cramped in their stalls are more likely to shift position during milking, which can cause the unit to fall off or to twist the teat cups. Stall length should allow the cow to stand comfortably without her udder being too close to the curb or too far away. For a herringbone parlor, the stall length from curb to front rail should be about 2.1 to 2.4 meters (7 to 8 feet). For a parallel parlor, the stall length is typically 1.9 to 2.1 meters (6.5 to 7 feet). ### Curb Height The curb is the wall between the operator pit and the cow standing area. The curb height affects how easily the milker can reach the udder. A curb that is too high makes it hard to reach the teats without bending over. A curb that is too low allows manure and water to splash into the pit. A curb height of 25 to 30 centimeters (10 to 12 inches) is standard. The curb should have a smooth, rounded top edge to prevent injury to the cow if she kicks or shifts her weight. ### Rail Placement The front rail in a herringbone parlor should be positioned so that the cow stands with her rear close to the curb but not touching it. If the rail is too far forward, the cow will stand too far back and will be difficult to milk. If the rail is too far back, the cow will be too close to the curb and may step on the milker's feet. The rail should be adjustable, or at least carefully positioned, to accommodate the range of body sizes in your herd. Heifers and mature cows have different body lengths, and the rail should be set so that the average cow stands in the correct position. ## Milking Routine and Parlor Layout The parlor layout should support a specific milking routine. The routine is the sequence of steps that the milker performs for each cow, from the moment the cow enters the stall until the unit is removed. A well designed parlor makes the routine easy to follow. A poorly designed parlor makes it difficult. ### The Five-Step Routine The standard milking routine recommended by the National Mastitis Council includes five steps: 1. Fore-strip the first streams of milk to check for abnormalities. 2. Pre-dip the teats with an approved teat disinfectant. 3. Allow 30 seconds of contact time for the disinfectant to work. 4. Dry the teats with single-use paper towels or a clean cloth. 5. Attach the milking unit. The parlor layout should support each of these steps. The milker needs a convenient place to hold the pre-dip applicator and the paper towels. The milker needs enough space to move between cows quickly. And the milker needs good lighting to see the fore-stripped milk clearly. ### Positioning of Supplies Pre-dip applicators, paper towels, and gloves should be positioned so that the milker does not have to walk more than a step or two to reach them. If the milker has to walk to the end of the pit to get a paper towel, the routine will be interrupted. Interruptions lead to inconsistent contact times and rushed preparation. Consider installing a small shelf or holder at each stall position. This allows the milker to keep supplies within arm's reach at all times. The shelf should be easy to clean and should not create a surface where bacteria can accumulate. ### Single-Use vs. Reusable Cloths The National Mastitis Council recommends single-use paper towels for teat drying. Reusable cloths can be washed and sanitized, but they carry a risk of contamination if they are not handled properly. If you choose to use reusable cloths, each cow must have a clean cloth, and the used cloths must be collected in a container that prevents cross-contamination. The parlor layout should include a convenient disposal point for used paper towels and cloths. A bin at each stall position or at the end of the pit keeps the work area clean and reduces the risk of towels falling on the floor and becoming contaminated. ### Glove Use Milkers should wear disposable gloves. Gloves protect the milker from exposure to bacteria and protect the cow from bacteria on the milker's hands. Gloves should be changed between cows if they become contaminated with manure or milk. The parlor should have a glove dispenser at a convenient location, and a disposal bin for used gloves. The milker should never touch a gloved hand to the floor, the rail, or any surface that may be contaminated with manure. ## Vacuum System Design The vacuum system is the heart of the milking machine. It provides the suction that opens the teat canal and draws milk from the udder. If the vacuum system is not designed and maintained properly, it can cause teat damage and increase the risk of mastitis. ### Vacuum Level The recommended vacuum level for a milking machine is typically 42 to 46 kPa (12.5 to 13.5 inches of mercury) at the claw. The exact level depends on the type of milking unit and the manufacturer's recommendations. Too high a vacuum level can cause teat end damage and increase the risk of infection. Too low a vacuum level can cause the unit to fall off and can result in incomplete milking. The vacuum level should be checked regularly with a calibrated gauge. The gauge should be placed at the receiver and at the end of the milking line to ensure that the vacuum is consistent throughout the system. ### Vacuum Reserve The vacuum pump must have sufficient reserve capacity to maintain a stable vacuum when multiple units are attached or removed at the same time. A common rule is to provide 35 to 45 liters of air per minute of vacuum reserve per milking unit for a high-line system, and 25 to 35 liters per minute for a low-line system. If the vacuum reserve is inadequate, the vacuum will fluctuate when units are attached or when a unit falls off. Fluctuating vacuum causes the teat cups to slip and can force bacteria into the teat canal. ### Vacuum Stability Vacuum stability is the ability of the system to maintain a constant vacuum under varying conditions. The vacuum controller, also called the regulator, is the component that maintains stability. The regulator should be sized correctly for the system and should be cleaned and tested regularly. A vacuum recorder should be used to monitor the system during milking. The recorder produces a chart that shows the vacuum level over time. This chart can reveal problems such as a sticking regulator, a blocked line, or an undersized pump. ### Pulsation The pulsation system creates the alternating vacuum and atmospheric pressure that massages the teat and prevents congestion. The pulsation rate is typically 55 to 65 cycles per minute, and the pulsation ratio is typically 60:40 or 70:30 (milking phase to rest phase). Pulsation should be checked regularly with a pulsation tester. A pulsation failure can cause teat congestion and increase the risk of mastitis. The pulsation system should be serviced according to the manufacturer's recommendations. ## Cleaning and Sanitation Systems The cleaning system is a critical part of the parlor design. A milking machine that is not cleaned properly will harbor bacteria and spread infection from cow to cow. The cleaning system should be designed as an integral part of the parlor, not as an afterthought. ### Clean-in-Place Systems Most modern parlors use a clean-in-place (CIP) system. The CIP system automatically circulates cleaning solutions through the milking lines and the receiver after each milking. The system should be designed so that all surfaces that come into contact with milk are reached by the cleaning solutions. The CIP system should include a wash sink or a wash receiver where the cleaning solutions are mixed. The wash sink should be large enough to hold the cleaning solutions and should be positioned so that the solutions can be circulated easily through the system. ### Cleaning Cycle A standard cleaning cycle includes three phases: 1. A warm water rinse to remove gross milk residue. 2. A hot wash with an alkaline detergent to remove milk fat and protein. 3. An acid rinse to neutralize the detergent and remove mineral deposits. The water temperature and the concentration of the cleaning solutions should be checked regularly. The water should be hot enough to dissolve milk fat but not so hot that it causes the milk protein to bake onto the pipe surfaces. ### Sanitizing Before Milking Immediately before milking, the system should be sanitized with a chlorine-based sanitizer or an approved alternative. This kills any bacteria that may have survived the cleaning cycle. The sanitizer should be circulated through the system and then drained before the first unit is attached. ### Cleaning the Parlor Environment The parlor environment must also be cleaned regularly. The floors, walls, and stalls should be washed down after each milking. The wash water should be drained away from the parlor and should not be allowed to pool on the floor. The milking units should be cleaned and inspected after each milking. The teat cup liners should be checked for cracks or wear, and the shells should be cleaned thoroughly. Liners should be replaced according to the manufacturer's recommendations, typically every 1,000 to 2,500 milkings. ## Ventilation and Environmental Control The parlor environment affects both the cows and the milkers. Poor ventilation can lead to heat stress in the cows, which reduces immune function and increases the risk of mastitis. High humidity and poor air quality can also affect the milkers' health and performance. ### Airflow at Cow Level The parlor should have positive airflow at cow level. This means that fresh air is introduced at the cow level and exhausted above the cows. This creates a flow of fresh air across the cows, which helps to cool them and to remove moisture and bacteria from the air. Fans should be positioned to create airflow along the length of the parlor, not across it. The airflow should be directed at the cows, not at the milkers. The fan speed should be adjustable so that the airflow can be reduced in cool weather. ### Humidity Control High humidity in the parlor increases the survival of bacteria in the environment. The parlor should be designed to minimize humidity. This means good ventilation, proper drainage, and avoiding the use of high-pressure water sprays that create mist. If the parlor is enclosed, consider installing a dehumidifier or an air-to-air heat exchanger. These systems remove moisture from the air while recovering heat in the winter. ### Temperature Control Cows are comfortable at temperatures between 5 and 25 degrees Celsius (41 and 77 degrees Fahrenheit). Above 25 degrees Celsius, cows begin to experience heat stress. Heat stress reduces feed intake, reduces milk production, and increases the risk of mastitis. In hot climates, the parlor should be equipped with fans and sprinklers. The sprinklers should wet the cows' backs, and the fans should evaporate the water to cool the cows. The sprinklers should be controlled by a thermostat or a timer so that they operate only when needed. In cold climates, the parlor should be heated to prevent the water lines and the milking equipment from freezing. The heating system should be designed to maintain a temperature above freezing even when the parlor is not in use. ## Lighting and Visibility Good lighting is essential for a successful milking routine. The milker must be able to see the teats clearly, to inspect the fore-stripped milk, and to detect signs of teat damage or infection. ### Lighting Levels The parlor should have a lighting level of at least 500 lux at the cow level and at the level of the milker's hands. This is roughly equivalent to the lighting in a well lit office. The lighting should be uniform, with no dark spots or glare. The lighting should be positioned so that the milker does not have to work in his or her own shadow. The lights should be mounted above and slightly behind the milker, so that the light falls on the cow's udder without creating a shadow. ### Color Rendering The lighting should have a high color rendering index (CRI). This means that the light reproduces colors accurately. A high CRI is important for detecting abnormal milk, which can be slightly pink, yellow, or clotted. A low CRI light source can mask these subtle color changes. LED lights with a CRI of 80 or higher are a good choice for milking parlors. They provide bright, uniform light with low energy consumption and a long lifespan. ### Emergency Lighting The parlor should have emergency lighting that operates automatically in the event of a power failure. This is important for the safety of the cows and the milkers. A power failure during milking can cause the cows to panic if they are left in the dark. The emergency lighting should be battery-powered or connected to a backup generator. The generator should be tested regularly to ensure that it starts reliably. ## Common Mistakes in Parlor Design Many parlor problems can be traced to design mistakes that were made during the planning phase. The following are some of the most common mistakes and how to avoid them. ### Mistake 1: Prioritizing Throughput Over Udder Health It is tempting to design a parlor for maximum throughput, with the idea that faster milking means more profit. But if the parlor is so rushed that the milking routine is compromised, the result will be higher mastitis rates, higher [somatic cell](/blog/guides/somatic-cell) counts, and lower milk quality premiums. The parlor should be designed for a realistic throughput that allows for a proper milking routine. As a general guide, a single milker can handle 8 to 10 cows per hour in a herringbone parlor with good teat preparation. A parallel parlor can achieve 12 to 15 cows per hour per milker. These figures assume that the routine is followed correctly. ### Mistake 2: Inadequate Vacuum Reserve Some producers try to save money by installing a smaller vacuum pump than recommended. This is a false economy. An undersized vacuum pump will cause vacuum fluctuations, which lead to teat damage and mastitis. The cost of treating a single case of clinical mastitis can exceed the cost of a properly sized vacuum pump. The vacuum pump should be sized by a qualified milking machine technician, and the system should be tested under load conditions. ### Mistake 3: Poor Drainage The parlor floor must have adequate drainage to remove wash water and urine. If water pools on the floor, it creates a slipping hazard and provides a breeding ground for bacteria. The floor should slope toward a central drain, and the drain should be large enough to handle the volume of water used during cleaning. The drain should be fitted with a trap to prevent odors from the waste system from entering the parlor. The drain should also be accessible for cleaning. ### Mistake 4: Ignoring the Holding Area The holding area is often the last part of the parlor to be considered, and it is often the dirtiest. A dirty holding area means dirty cows, and dirty cows mean contaminated udders. The holding area should be cleaned regularly, and the cows should be kept clean between milkings. If the holding area is outside, it should be shaded in the summer and protected from wind in the winter. If it is inside, it should have the same ventilation and lighting standards as the parlor itself. ### Mistake 5: Not Planning for Expansion Many producers build a parlor that is just large enough for their current herd, with no room for expansion. When the herd grows, the parlor becomes a bottleneck, and the milking routine is rushed to compensate. When planning a new parlor, consider the potential for herd growth. It is often cheaper to build a slightly larger parlor now than to renovate or rebuild in a few years. ## Monitoring and Recordkeeping The parlor design is only the beginning. To maintain udder health over the long term, you must monitor the performance of the parlor and the health of the cows. Good recordkeeping allows you to identify problems early and to make informed decisions about changes. ### Somatic Cell Count The somatic cell count (SCC) is the primary indicator of udder health. A cow with an SCC below 200,000 cells per milliliter is considered uninfected. A cow with an SCC above 200,000 is likely infected with a mastitis-causing pathogen. The bulk tank SCC should be monitored regularly. A bulk tank SCC above 200,000 cells per milliliter indicates that there is a significant level of infection in the herd. Individual cow SCC should be monitored through the Dairy Herd Improvement (DHI) program or through regular testing. ### Mastitis Incidence The clinical mastitis incidence rate is the number of new clinical cases per 100 cows per year. A herd with a mastitis incidence rate below 25 cases per 100 cows per year is doing well. A rate above 40 cases per 100 cows per year indicates that there is a problem that needs to be addressed. Clinical mastitis cases should be recorded individually, with the cow identification, the date, the affected quarter, and the treatment given. This information can be used to identify cows that are chronic cases and to evaluate the effectiveness of treatment protocols. ### Milking Machine Testing The milking machine should be tested by a qualified technician at least twice a year. The test should include vacuum level, vacuum stability, pulsation rate and ratio, and the condition of the liners and other rubber parts. The results of the milking machine test should be recorded and kept on file. If mastitis rates increase, the test results can be reviewed to determine whether the machine is a contributing factor. ### Parlor Routine Audits The milking routine should be audited regularly to ensure that it is being followed correctly. The audit should observe the milkers and record the time spent on each step of the routine. The audit should also note any deviations from the standard procedure, such as pre-dipping with insufficient contact time or attaching units to wet teats. The audit should be conducted by someone who is not directly involved in the milking, so that the observations are objective. The results of the audit should be discussed with the milkers, and any problems should be addressed through training. ### Records You Should Keep The following records should be maintained for each milking session: - Date and time of milking - Number of cows milked - Bulk tank SCC - Any clinical mastitis cases - Any equipment problems or malfunctions - Cleaning and sanitation records - Milking machine test results These records should be reviewed regularly to identify trends. A gradual increase in SCC, for example, may indicate that the milking routine is becoming less consistent. A sudden increase in clinical mastitis may indicate a problem with the milking machine or with a particular group of cows. ## When to Call a Veterinarian or Extension Agent There are times when the expertise of a veterinarian or an extension agent is essential. Do not try to solve every problem on your own. The following situations warrant professional assistance: ### Sudden Increase in Mastitis If the clinical mastitis rate doubles within a month, or if the bulk tank SCC rises sharply, contact your veterinarian immediately. A sudden increase in mastitis can be caused by a contagious pathogen such as Staphylococcus aureus or Streptococcus agalactiae, which require aggressive intervention to control. Your veterinarian can culture milk samples to identify the pathogen and can recommend appropriate treatment and control measures. The veterinarian can also help you identify the source of the infection, which may be the milking machine, the environment, or an infected cow that is shedding large numbers of bacteria. ### Milking Machine Problems If the milking machine test reveals problems with vacuum stability, pulsation, or other components, contact a qualified milking machine technician. Do not attempt to repair the machine yourself unless you have the appropriate training and equipment. A malfunctioning milking machine can cause serious damage to the cows' teats and can lead to a rapid increase in mastitis. The machine should be repaired before the next milking session. ### Design Consultation If you are planning a new parlor or a major renovation, consult with an extension agent or a dairy facility designer before you start construction. The cost of professional design advice is small compared to the cost of correcting a design mistake after the parlor is built. An extension agent can provide information on the latest research on parlor design and udder health. The agent can also help you evaluate the trade-offs between different parlor types and can connect you with other producers who have experience with the type of parlor you are considering. ### Chronic Mastitis Problems If you have been struggling with mastitis for several months and your efforts to control it have not been successful, it is time to bring in outside help. A veterinarian with expertise in dairy herd health can conduct a comprehensive investigation of your operation, including the milking routine, the milking machine, the environment, and the cow management practices. The investigation may reveal problems that you have not considered, such as a contaminated water supply, poor ventilation in the barn, or a problem with the bedding material. The veterinarian can help you develop a comprehensive mastitis control plan that addresses all of the contributing factors. ## Frequently Asked Questions ### What is the best parlor type for udder health? There is no single best parlor type. Herringbone, parallel, and rotary parlors can all support excellent udder health if they are designed and managed properly. The key factors are consistent milking routine, good visibility of the teats, proper vacuum stability, and rigorous cleaning. Choose the parlor type that fits your herd size, labor situation, and building constraints, and then invest in the routine and the monitoring that protect udder health. ### How much space does each cow need in the holding area? Allow 1.4 to 1.9 square meters (15 to 20 square feet) per cow in the holding area. This gives the cows enough room to stand comfortably without being crowded. A crowded holding area increases stress and the risk of manure contamination. The holding area should be cleaned regularly and should have good ventilation. ### How often should the milking machine be tested? The milking machine should be tested by a qualified technician at least twice a year. The test should include vacuum level, vacuum stability, pulsation rate and ratio, and the condition of the liners and other rubber parts. If you are experiencing mastitis problems, the machine should be tested more frequently. ### How long should the pre-dip contact time be? The pre-dip should be allowed to remain on the teats for at least 30 seconds before the teats are dried. This contact time allows the disinfectant to kill the bacteria on the teat skin. If the contact time is too short, the disinfectant will not be effective. The contact time should be measured, not estimated, and the routine should be audited regularly. ### Should I use single-use paper towels or reusable cloths? Single-use paper towels are recommended by the National Mastitis Council because they eliminate the risk of cross-contamination between cows. If you choose to use reusable cloths, each cow must have a clean cloth, and the used cloths must be collected and sanitized properly. The risk of contamination is higher with reusable cloths, so they require more careful management. ### What is the ideal vacuum level for a milking machine? The recommended vacuum level is 42 to 46 kPa (12.5 to 13.5 inches of mercury) at the claw. The exact level depends on the type of milking unit and the manufacturer's recommendations. The vacuum level should be checked regularly with a calibrated gauge, and the system should be tested under load conditions. ### How can I tell if my vacuum system is fluctuating? A vacuum recorder produces a chart that shows the vacuum level over time during milking. If the chart shows significant fluctuations, the vacuum system is not stable. Common causes of vacuum fluctuation include an undersized pump, a sticking regulator, a blocked line, or a leak in the system. A milking machine technician can diagnose and correct the problem. ### What should I do if I see a sudden increase in clinical mastitis? Contact your veterinarian immediately. A sudden increase in clinical mastitis can be caused by a contagious pathogen such as Staphylococcus aureus or Streptococcus agalactiae, which require aggressive intervention to control. Your veterinarian can culture milk samples to identify the pathogen and can recommend appropriate treatment and control measures. ## Related Farming Guides This section will be populated with links to related farming guides on this site, covering topics such as mastitis prevention, milking routine best practices, somatic cell count management, dairy facility design, and milking machine maintenance. Check back for updates or use the site search to find additional resources. ## Related Clinical & Scientific Guides * [Evaluating Feed Additives for Dairy Cow Performance](/knowledge/animal-farming/dairy-cattle/evaluating-feed-additives-for-dairy-cow-performance) * [Dairy Barn Fire Safety: Design and Prevention Measures](/knowledge/animal-farming/dairy-cattle/dairy-barn-fire-safety-design-prevention) * [Dairy Cow Pregnancy Loss Records and Review](/knowledge/animal-farming/dairy-cattle/dairy-cow-pregnancy-loss-records-and-review) ## References - National Mastitis Council: https://www.nmconline.org/ - USDA APHIS Dairy Cattle Health: https://www.aphis.usda.gov/livestock-poultry-disease/cattle - FAO Dairy Production and Products: https://www.fao.org/dairy-production-products/en/ - FAO Animal Production and Health: https://www.fao.org/animal-production/en/ - WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/ > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.