# [Dairy Cow Mineral Supplementation](/knowledge/animal-farming/dairy-cattle/dairy-cow-mineral-supplementation-balancing): Requirements and Programs


## Key Takeaways

- Balancing macro minerals (calcium, phosphorus, magnesium, potassium, sodium, chlorine, sulfur) and trace minerals (copper, zinc, manganese, selenium, iodine, cobalt, iron) is critical, with requirements varying by forage mineral content, production stage (e.g., late gestation, early lactation), and environmental factors.
- Calcium and phosphorus ratios are vital, with a target of 1.5:1 to 2:1 for lactating cows, and specific dry cow rations are formulated using the dietary cation-anion difference (DCAD) to prevent milk fever.
- Magnesium deficiency (grass tetany) is a risk in cows grazing lush pastures, exacerbated by high potassium, and is managed through magnesium oxide supplementation and avoiding high-potassium forages.
- Selenium supplementation is geographically dependent due to soil variability, with deficiency signs including retained placenta and poor fertility, necessitating careful monitoring to avoid toxicity, which has a narrow therapeutic window.
- Trace mineral interactions are significant; high molybdenum, sulfur, or iron can antagonize copper absorption, and chelated or organic forms may improve absorption in high-forage diets.
- Accurate forage analysis, including mineral content and potential antagonists, alongside water testing and animal health monitoring, forms the basis for designing effective supplementation programs to prevent deficiencies and toxicities.

---

## At a Glance

[Dairy cow mineral supplementation](/knowledge/animal-farming/dairy-cattle/dairy-cow-mineral-supplementation-balancing) requires balancing macro minerals (calcium, phosphorus, magnesium, potassium, sodium, chlorine, sulfur) and trace minerals (copper, zinc, manganese, selenium, iodine, cobalt, iron) against forage mineral content, production stage, and environmental factors. The table below summarizes key mineral functions, common deficiency indicators, and primary supplementation considerations for dairy operations.

| Mineral | Primary Function | Common Deficiency Signs | Supplementation Considerations |
|---------|-----------------|------------------------|-------------------------------|
| Calcium | Bone formation, muscle contraction, milk synthesis | Milk fever, weak calves, poor uterine tone | Balance with phosphorus, increase in late gestation and early lactation |
| Phosphorus | Energy metabolism, bone structure, rumen microbes | Poor appetite, reduced milk yield, infertility | Monitor forage phosphorus levels, avoid excess that impairs calcium absorption |
| Magnesium | Enzyme activation, nerve function, carbohydrate metabolism | Grass tetany, muscle tremors, reduced feed intake | Supplement during lush pasture grazing, magnesium oxide common source |
| Selenium | Antioxidant defense, immune function, thyroid metabolism | Retained placenta, white muscle disease, poor fertility | Regional soil levels vary, injectable and oral forms available, toxicity risk at high levels |
| Copper | Iron metabolism, immune response, coat pigmentation | Faded hair color, poor growth, diarrhea, weak calves | Antagonized by molybdenum, sulfur, iron, monitor forage copper levels |
| Zinc | Skin integrity, hoof health, immune function, reproduction | Hoof lesions, poor wound healing, reduced feed intake | Organic chelated forms may improve absorption in high-forage diets |

## Macro Mineral Requirements and Management

### Calcium and Phosphorus Balance

Calcium and phosphorus are the most abundant minerals in the dairy cow body and are critical for bone structure, milk production, and metabolic function. The ratio of calcium to phosphorus in the total diet should be maintained between 1.5:1 and 2:1 for most lactating cows, though dry cow rations may require different ratios to prevent milk fever. Forage analysis from your specific fields is essential because calcium and phosphorus content varies significantly across feed types and growing conditions. The Merck Veterinary Manual provides guidance on mineral nutrition management for dairy cattle, emphasizing that calcium requirements increase dramatically at the onset of lactation when the cow mobilizes bone calcium for milk synthesis.

Phosphorus requirements are influenced by milk production level, with higher-yielding cows needing more dietary phosphorus. However, excess phosphorus excretion contributes to environmental concerns and can interfere with calcium absorption. Soil phosphorus levels affect forage phosphorus content, and regional differences in soil mineral composition mean that blanket recommendations may not apply to your operation. The USDA Natural Resources Conservation Service offers resources on soil testing and nutrient management planning that can help you assess phosphorus levels in your forages and pastures.

### Magnesium and Grass Tetany Prevention

Magnesium deficiency, commonly called grass tetany or hypomagnesemia, typically occurs in lactating cows grazing lush, fast-growing pastures in spring or fall. The condition results from low magnesium availability in forages combined with high potassium levels that interfere with magnesium absorption. Clinical signs include muscle tremors, staggering, hyperexcitability, and recumbency, and the condition can progress rapidly to death if untreated.

Prevention strategies include supplementing magnesium oxide in mineral mixes or feed, applying magnesium-containing fertilizers to pastures, and providing high-magnesium mineral blocks during high-risk periods. The Veterinary Clinics of North America Food Animal Practice publication on mineral and water nutrition discusses magnesium metabolism and supplementation approaches for grazing dairy cattle. Cows in early lactation are most susceptible because milk contains significant magnesium and feed intake may not meet requirements during the transition period.

### Potassium and Sodium Considerations

Potassium is the third most abundant mineral in the dairy cow body and is essential for acid-base balance, nerve transmission, and muscle function. High-potassium forages, particularly those grown on heavily fertilized soils or harvested at early maturity stages, can contribute to metabolic disorders including milk fever and displaced abomasum. The dietary cation-anion difference (DCAD) concept, which considers the balance of sodium, potassium, chloride, and sulfur, is used to formulate dry cow rations that reduce hypocalcemia risk.

Sodium and chlorine are typically supplied through salt (sodium chloride) in the diet. Lactating cows require 0.18 to 0.25 percent sodium in the diet dry matter, and salt is often included in mineral mixes at 0.5 to 1.0 percent of the total ration. Free-choice salt should always be available, but cows consuming total mixed rations may not need additional free-choice access if the ration is properly formulated.

## Trace Mineral Requirements and Supplementation

### Selenium: Regional Variability and Supplementation Options

Selenium requirements for dairy cattle are influenced by geographic location because soil selenium content varies dramatically across regions. Areas with low soil selenium produce forages with inadequate selenium levels, requiring supplementation to prevent deficiency. The New Zealand Veterinary Journal review on selenium requirements in grazing dairy cows discusses the relationship between soil selenium, forage selenium content, and animal requirements. Selenium deficiency in dairy cattle is associated with retained placenta, poor fertility, white muscle disease in calves, and impaired immune function.

Supplementation options include selenium-enriched mineral mixes, selenium yeast, and injectable selenium products. The Journal of Animal Science publication on the effect of selenium supplementation in dairy cattle provides background on supplementation approaches. Injectable selenium products are commonly used in the prepartum period to improve selenium status in newborn calves and reduce the incidence of retained placenta. However, selenium toxicity is a serious concern because the margin between adequate and toxic levels is narrow. Maximum tolerable levels established by feed regulatory authorities should not be exceeded, and total dietary selenium should be monitored through feed analysis.

### Copper, Zinc, and Manganese Interactions

Copper, zinc, and manganese are essential trace minerals that interact with each other and with other dietary components. High levels of molybdenum, sulfur, and iron in forages can reduce copper absorption, leading to secondary copper deficiency even when dietary copper levels appear adequate. The Veterinary Clinics of North America Food Animal Practice publication on pasture minerals for dairy cattle addresses these interactions in grazing systems. Forage analysis should include molybdenum and sulfur levels to assess copper availability.

Zinc is critical for hoof health, skin integrity, and immune function. Dairy cows with zinc deficiency may develop hoof lesions, poor wound healing, and reduced feed intake. Manganese is involved in bone formation, reproduction, and carbohydrate metabolism. Supplementation with chelated or organic forms of these trace minerals may improve absorption compared to inorganic sulfate or oxide forms, particularly in high-forage diets where antagonists are present. The Indian Veterinary Journal publication on chelated trace mineral supplementation in dairy cows discusses performance effects in specific production systems.

### Iodine and Cobalt Requirements

Iodine is essential for thyroid hormone synthesis, which regulates metabolism and growth. Iodine deficiency in dairy cattle can cause goiter in newborn calves, reduced fertility, and decreased milk production. Forages grown in iodine-deficient soils, particularly in mountainous or inland regions, may not meet cow requirements. Iodine supplementation is typically provided through iodized salt or mineral mixes, but excessive iodine intake can be toxic and may cause thyroid dysfunction.

Cobalt is required by rumen microbes for vitamin B12 synthesis, which is essential for energy metabolism and [red blood cell](/blog/guides/red-blood-cell) formation. Cobalt deficiency results in poor growth, reduced appetite, and anemia. Most commercial mineral mixes contain adequate cobalt, but cows grazing cobalt-deficient pastures for extended periods may require additional supplementation. Soil testing and forage analysis can help identify cobalt-deficient regions.

## Forage Mineral Content Variability

### Factors Affecting Forage Mineral Levels

Forage mineral content varies with plant species, maturity stage, soil type, fertilization practices, and environmental conditions. The Journal of Dairy Science publication on variability in mineral and trace element content of dairy cattle feeds documents the wide range of mineral concentrations found in common feedstuffs. Legumes such as alfalfa typically contain higher calcium and magnesium levels than grasses, while grasses may have higher potassium and lower calcium content. Forage maturity at harvest affects mineral concentrations, with younger, more vegetative forages generally having higher mineral content than mature, stemmy forages.

Soil pH influences mineral availability to plants. Acidic soils reduce availability of calcium, phosphorus, and magnesium while increasing availability of manganese and iron. Alkaline soils may reduce zinc and copper availability. Soil testing through your local extension service or the USDA Natural Resources Conservation Service can identify mineral deficiencies or excesses that affect forage quality. Fertilization practices, particularly nitrogen and potassium applications, can alter forage mineral composition and affect animal health.

### Sampling and Analysis Protocols

Accurate forage mineral analysis requires proper sampling techniques. Collect representative samples from each field or cutting, using a forage probe to sample multiple locations within the field. Combine subsamples into a composite sample for analysis. Submit samples to a certified forage testing laboratory that offers mineral analysis packages including calcium, phosphorus, magnesium, potassium, sodium, sulfur, copper, zinc, manganese, iron, molybdenum, and selenium.

Sample at least once per cutting for hay and haylage, and weekly for silage from bunkers or bags because mineral content can change as silage ferments and as different parts of the silo are fed. For pasture, sample at the beginning of each grazing rotation and when forage species composition changes significantly. Record sampling dates, field locations, forage species, and maturity stage to track mineral content patterns over time.

## Supplementation Program Design

### Assessing Current Mineral Status

Before designing a supplementation program, assess the current mineral status of your herd through forage analysis, water testing, and animal evaluation. Water mineral content, particularly iron, sulfur, and sodium, can contribute significantly to total mineral intake and affect absorption of other minerals. Test water sources at least annually, and more frequently if water quality changes or if mineral-related health problems appear.

Animal evaluation includes monitoring body condition score, hoof health, coat condition, reproductive performance, and incidence of metabolic disorders. Blood mineral analysis can help identify deficiencies or excesses, but interpretation requires understanding of normal ranges and factors that affect blood mineral levels. Work with your veterinarian to determine if blood testing is appropriate for your herd and to interpret results in the context of your feeding program.

### Formulating Mineral Mixes

Commercial mineral mixes are formulated for specific production stages and feeding systems. Lactating cow mineral mixes typically contain higher calcium and phosphorus levels than dry cow mixes, while dry cow mixes may include anionic salts to prevent milk fever. Pasture-based systems may require different mineral formulations than total mixed ration systems because forage mineral content and intake patterns differ.

When formulating your own mineral mix, consider the following steps:

1. Analyze all forages and feeds for mineral content
2. Calculate total mineral intake from forages and grains
3. Determine mineral requirements based on production stage, milk yield, and body weight
4. Subtract mineral contributions from forages and grains from total requirements
5. Formulate a mineral supplement that provides the remaining mineral needs
6. Include appropriate carriers and palatability enhancers to ensure adequate intake

The Merck Veterinary Manual provides reference tables for mineral requirements at different production stages. However, these values are general guidelines, and your specific herd may have different requirements based on genetics, environment, and management practices.

### Delivery Methods and Intake Monitoring

Mineral supplements can be delivered through total mixed rations, top-dressing, free-choice mineral feeders, or injectable products. Total mixed ration inclusion ensures consistent intake but requires accurate mixing and delivery. Top-dressing allows individual cow adjustment but is labor-intensive. Free-choice mineral feeders rely on cows consuming adequate amounts voluntarily, which can be influenced by palatability, feeder placement, and competition among cows.

Monitor mineral intake by weighing mineral feeders regularly and calculating average daily intake per cow. Target intake levels should be within 10 percent of the formulated amount. If intake is consistently low, check feeder placement, mineral palatability, and competition. If intake is high, verify that the mineral mix is not being consumed excessively due to salt content or other palatability factors. Adjust formulations as needed to achieve target intake.

## Records and Measurements

### Mineral Intake Tracking

Maintain records of mineral supplement purchases, inventory, and consumption. Record the date, amount of mineral added to feeders or mixers, and the number of cows being fed. Calculate weekly or monthly average mineral intake per cow and compare to target levels. Note any changes in mineral formulation, supplier, or delivery method that may affect intake.

Track forage mineral analysis results over time to identify trends and seasonal patterns. Create a spreadsheet or database that includes sample date, field location, forage species, maturity stage, and mineral concentrations for each sample. Use this information to adjust mineral supplementation as forage mineral content changes throughout the year.

### Health and Performance Monitoring

Record incidence of metabolic disorders including milk fever, grass tetany, ketosis, and displaced abomasum. Track reproductive performance metrics such as calving interval, services per conception, and incidence of retained placenta. Monitor hoof health through routine hoof trimming records, noting the prevalence of white line disease, sole ulcers, and other lesions that may be associated with mineral deficiencies.

[Body condition scoring](/knowledge/animal-farming/farm-management/body-condition-scoring-a-tool-for-feed-management) at calving, peak lactation, and dry-off provides information about energy and mineral status. Cows that lose excessive body condition during early lactation may be at higher risk for mineral deficiencies. Work with your veterinarian to establish herd-specific targets for body condition score and to identify cows that fall outside acceptable ranges.

## Common Failure Patterns

### Inadequate Mineral Intake

The most common failure in mineral supplementation programs is inadequate intake. Cows may not consume enough mineral supplement due to poor palatability, improper feeder placement, competition from [dominant](/blog/careers/dominant-definition-biology) cows, or insufficient feeder space. Mineral mixes that contain high levels of bitter-tasting ingredients or that have been stored improperly may be rejected by cows.

Solution: Evaluate feeder placement and ensure adequate feeder space for all cows. Provide mineral feeders in multiple locations, particularly in large pastures or group housing systems. Check mineral freshness and replace old or caked mineral. Consider adding palatability enhancers such as molasses or dried distillers grains to improve intake.

### Antagonist Interactions

Mineral antagonists can reduce absorption of essential minerals even when dietary levels appear adequate. High dietary sulfur from water or feed can reduce copper and selenium absorption. High molybdenum in forages can induce copper deficiency. High iron levels can interfere with zinc and manganese absorption. Calcium and phosphorus ratios that are out of balance can impair absorption of both minerals.

Solution: Analyze water and all feed ingredients for mineral content, including antagonists. Calculate total dietary levels of antagonists and adjust mineral supplementation accordingly. Consider using chelated or organic trace mineral forms that are less affected by antagonists. Work with a nutritionist to balance mineral ratios and account for interactions.

### Seasonal and Environmental Factors

Mineral requirements and forage mineral content change with seasons. Spring pasture growth is often high in potassium and low in magnesium, increasing grass tetany risk. Summer heat stress can reduce feed intake and mineral consumption. Fall forages may have lower mineral content due to plant maturity. Winter feeding of stored forages may provide different mineral profiles than fresh pasture.

Solution: Adjust mineral supplementation programs seasonally based on forage analysis and observed health problems. Increase magnesium supplementation during spring and fall grazing periods. Monitor mineral intake more frequently during periods of environmental stress. Consider using slow-release mineral supplements or injectable products during high-risk periods.

## Welfare and Safety Context

### Animal Welfare Implications

Mineral deficiencies directly affect animal welfare through pain, discomfort, and reduced quality of life. Cows with milk fever experience weakness, recumbency, and potential nerve damage. Grass tetany causes muscle tremors, seizures, and death if untreated. Copper deficiency can cause diarrhea, poor growth, and increased susceptibility to infection. Selenium deficiency contributes to retained placenta and white muscle disease in calves.

Proper mineral supplementation prevents these welfare problems and supports normal physiological function. However, over-supplementation can also cause welfare issues. Selenium toxicity can cause hair loss, hoof deformities, and death. Copper toxicity can cause liver damage and jaundice. Iodine toxicity can cause respiratory distress and thyroid dysfunction. Follow established guidelines for maximum tolerable mineral levels and monitor total dietary mineral intake.

### [Food Safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) Considerations

Mineral supplementation programs must consider food safety, particularly for minerals that can accumulate in milk or tissues. Selenium supplementation levels are regulated in many countries to prevent excessive selenium in milk and meat. Copper supplementation must be managed to avoid copper accumulation in liver tissue, which can exceed regulatory limits. Iodine supplementation should be monitored to prevent elevated iodine levels in milk.

Withdrawal periods for injectable mineral products must be observed according to label instructions. Record the date, product, dose, and route of administration for all injectable mineral supplements. Maintain treatment records that include animal identification, withdrawal period, and milk or meat discard dates. Work with your veterinarian to ensure compliance with regulatory requirements for mineral supplementation.

### Worker Safety

Mineral supplements, particularly those containing selenium, copper, or anionic salts, can be hazardous if handled improperly. Wear appropriate personal protective equipment including gloves and dust masks when mixing or handling mineral supplements. Store mineral supplements in labeled containers away from feed ingredients and water sources. Follow manufacturer safety data sheets for handling and storage instructions.

Anionic salt mixes used in dry cow rations can cause skin and eye irritation. Mix these products in well-ventilated areas and avoid creating dust. Train workers on proper handling procedures and emergency response for mineral supplement spills or exposure.

## Professional Escalation Criteria

### When to Consult a Veterinarian

Consult your veterinarian when you observe clinical signs of mineral deficiency or toxicity in your herd. Signs that warrant veterinary evaluation include:

- Multiple cases of milk fever, grass tetany, or retained placenta
- Unexplained infertility or poor reproductive performance
- Hoof lesions or lameness that does not respond to routine hoof care
- Poor growth or weak calves
- Unusual coat color changes or hair loss
- Diarrhea or poor feed conversion that is not explained by other causes

Your veterinarian can perform diagnostic testing including blood mineral analysis, liver biopsy for copper status, or tissue selenium analysis. They can also help interpret test results in the context of your feeding program and recommend appropriate treatment or supplementation changes.

### When to Consult a Nutritionist

Consult a dairy nutritionist when designing or modifying your mineral supplementation program, particularly if you are formulating your own mineral mixes. A nutritionist can help you:

- Interpret forage and water analysis results
- Calculate mineral requirements for your specific herd
- Formulate mineral supplements that account for antagonist interactions
- Develop seasonal supplementation strategies
- Troubleshoot mineral-related health or performance problems

Nutritionists with experience in your region can provide valuable insights about local forage mineral content and common deficiency patterns. They can also help you evaluate commercial mineral products and determine which formulations are appropriate for your operation.

### When to Consult Extension Services

Contact your local cooperative extension service or the USDA Natural Resources Conservation Service for assistance with soil testing, forage sampling, and nutrient management planning. These services can provide:

- Soil testing and interpretation
- Forage sampling guidance and laboratory recommendations
- Information about regional mineral deficiency patterns
- Educational resources on mineral nutrition
- Cost-share programs for soil testing and nutrient management

Extension specialists can also connect you with other resources including veterinary diagnostic laboratories, feed analysis laboratories, and industry organizations that provide mineral nutrition information.

## Frequently Asked Questions

### What is the ideal calcium to phosphorus ratio for lactating dairy cows?

The ideal calcium to phosphorus ratio for lactating dairy cows is typically between 1.5:1 and 2:1. This ratio supports bone health, milk production, and metabolic function. Ratios outside this range can impair mineral absorption and increase the risk of metabolic disorders. Forage analysis is essential to determine the actual calcium and phosphorus content of your feeds and to formulate supplements that achieve the target ratio.

### How do I know if my cows are getting enough selenium?

Signs of adequate selenium status include normal reproductive performance, low incidence of retained placenta, healthy calves without white muscle disease, and good immune function. Blood selenium analysis can provide a more objective assessment, with target levels depending on the laboratory reference range. Work with your veterinarian to determine if blood testing is appropriate for your herd and to interpret results. Regional soil selenium levels affect forage selenium content, so knowing your area's selenium status helps guide supplementation decisions.

### Can I over-supplement trace minerals to my dairy cows?

Yes, over-supplementation of trace minerals can cause toxicity and health problems. Selenium has a narrow margin between adequate and toxic levels, and excessive selenium can cause hair loss, hoof deformities, and death. Copper toxicity can cause liver damage and jaundice. Iodine toxicity can cause respiratory distress and thyroid dysfunction. Follow established guidelines for maximum tolerable mineral levels and monitor total dietary mineral intake from all sources including forages, water, and supplements.

### What is the best way to deliver mineral supplements to grazing dairy cows?

Free-choice mineral feeders are the most common delivery method for grazing dairy cows. Place feeders in areas where cows congregate, such as near water sources or shade, and provide adequate feeder space to reduce competition. Monitor mineral intake regularly and adjust feeder placement or mineral formulation if intake is inadequate. Some operations use molasses-based mineral blocks or liquid supplements for pasture-based systems. Injectable mineral products can be used for specific situations such as prepartum selenium supplementation.

### How often should I test my forages for mineral content?

Test forages for mineral content at least once per cutting for hay and haylage, and weekly for silage from bunkers or bags. For pasture, test at the beginning of each grazing rotation and when forage species composition changes significantly. More frequent testing may be needed if you observe mineral-related health problems or if forage mineral content is known to vary in your region. Consistent testing over multiple years helps identify trends and seasonal patterns in forage mineral content.

### What minerals are most important for hoof health in dairy cows?

Zinc is the most important mineral for hoof health, as it is essential for keratin production and wound healing. Copper and manganese also play roles in hoof structure and integrity. Biotin, while not a mineral, is often supplemented with zinc for hoof health. Selenium deficiency can contribute to hoof problems through its effects on immune function and tissue integrity. Ensure adequate intake of these minerals through balanced supplementation and monitor hoof health through routine hoof trimming records.

### How do high molybdenum levels in forages affect copper supplementation?

High molybdenum levels in forages reduce copper absorption by forming insoluble complexes in the rumen. This can lead to secondary copper deficiency even when dietary copper levels appear adequate. Forage analysis should include molybdenum and sulfur levels to assess copper availability. When molybdenum levels are high, increase copper supplementation and consider using chelated copper forms that are less affected by antagonists. Work with a nutritionist to determine appropriate copper supplementation levels based on forage molybdenum content.

### What is the role of anionic salts in dry cow mineral programs?

Anionic salts are mineral supplements that lower the dietary cation-anion difference (DCAD) in dry cow rations. They help prevent milk fever by inducing a mild metabolic acidosis that improves calcium mobilization from bone and enhances calcium absorption from the gut. Common anionic salts include ammonium chloride, ammonium sulfate, calcium chloride, and magnesium sulfate. Anionic salt supplementation should be implemented under veterinary or nutritional guidance because improper use can cause metabolic acidosis and reduce feed intake.

## Related Farming Guides

- [Dairy Cow Cooling System Management](/knowledge/animal-farming/dairy-cattle/dairy-cow-cooling-system-management)
- [Dairy Cow Culling Decisions And Records](/knowledge/animal-farming/dairy-cattle/dairy-cow-culling-decisions-and-records)
- [How To Design A Comfortable Dairy Cow Barn](/knowledge/animal-farming/dairy-cattle/how-to-design-a-comfortable-dairy-cow-barn)
- [Beef Cattle Farming Forage Reproduction Calving Health Signals And Herd Management](/knowledge/animal-farming/beef-cattle/beef-cattle-farming-forage-reproduction-calving-health-signals-and-herd-management)
- [Dairy Cattle Farming Nutrition Housing Health Signals And Herd Management](/knowledge/animal-farming/dairy-cattle/dairy-cattle-farming-nutrition-housing-health-signals-and-herd-management)

## 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 and Further Reading

- [www.nrcs.usda.gov](https://www.nrcs.usda.gov/)
- [www.merckvetmanual.com](https://www.merckvetmanual.com/management-and-nutrition)
- [Pasture Minerals for Dairy Cattle.](https://pubmed.ncbi.nlm.nih.gov/37419828). The Veterinary clinics of North America. Food animal practice, 2023.
- [Effect of selenium supplementation on dairy cattle.](https://pubmed.ncbi.nlm.nih.gov/1474030). Journal of animal science, 1992.
- [Mineral and water nutrition.](https://pubmed.ncbi.nlm.nih.gov/1893277). The Veterinary clinics of North America. Food animal practice, 1991.
- [Variability in mineral and trace element content of dairy cattle feeds.](https://pubmed.ncbi.nlm.nih.gov/1102573). Journal of dairy science, 1975.
- [Vitamin E supplementation during the dry period in dairy cattle. Part I: adverse effect on incidence of mastitis postpartum in a double-blind randomized field trial.](https://pubmed.ncbi.nlm.nih.gov/21094740). Journal of dairy science, 2010.
- [Selenium requirements in grazing dairy cows: a review.](https://pubmed.ncbi.nlm.nih.gov/31607238). New Zealand veterinary journal, 2020.
- [Injectable mineral supplementation to transition period dairy cows and its effects on animal health](https://doi.org/10.1007/s00580-016-2378-y). Comparative [Clinical Pathology](/knowledge/veterinary-medicine/veterinary-pathology-microbiology/clinical-pathology-hematology-and-biochemistry-interpretation), 2017.
- [Effect of dietary supplementation of chelated tracemineral mix (Complemin MF Dry) on performance in dairy cows of cauvery delta region](https://api.elsevier.com/content/abstract/scopus_id/84994577443). Indian Veterinary Journal, 2016.
- [Influence of macro and micro minerals in the peri-parturient period on fertility in dairy cattle](https://doi.org/10.1016/j.anireprosci.2006.08.004). Animal Reproduction Science, 2006.
- [Effect of parenteral trace element supplementation on oxidative stress and transcriptomic profile of peripheral blood in peripartum dairy cows](https://doi.org/10.30972/vet.3527857). Revista Veterinaria, 2024.

> This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.