Sheep Hay Selection: Nutritional Needs and Feeding Strategies

Hay is the backbone of most sheep feeding programs, yet its quality varies more than any other feed ingredient on a typical farm. Selecting the right hay requires matching forage quality to the physiological stage of the flock, from dry ewes in early gestation to lactating ewes and growing lambs. This guide covers hay types, nutritional analysis, feeding strategies across production stages, and a practical quality evaluation checklist for farm use.

At a Glance

The table below summarizes the main hay categories, their typical applications in sheep feeding, and key management considerations. Use it as a starting point when planning forage purchases or evaluating current feeding programs.

Why Hay Quality Determines Flock Performance

Sheep are ruminants, and their digestive system depends on a stable population of microbes in the rumen that ferment fiber into volatile fatty acids. The quality of hay directly influences how well that fermentation proceeds. Low-quality, high-fiber feeds like straw or mature hay can reduce feed intake, slow digestion, and limit nutrient absorption in sheep and goats, particularly in tropical regions where such feeds are common. These substandard diets are frequently supplemented with high-energy and protein-rich ingredients to correct the shortfall.

The cost of feeding represents a major share of total animal production expenses. Improving nutrient utilization and accurately assessing nutrient needs are therefore critical for profitable sheep operations. Hay selection is not simply about buying the cheapest bale. It is about matching forage quality to the animal's requirements so that every kilogram of feed contributes to maintenance, growth, reproduction, or milk production.

Nutritional Analysis of Hay for Sheep

Protein Content and Its Role

Crude protein is the most commonly measured hay quality parameter, and it drives many feeding decisions. Legume hays such as alfalfa typically contain higher protein than grass hays cut at the same maturity. Research with Barki rams showed that diets containing a higher proportion of alfalfa hay produced higher blood concentrations of total protein, albumin, globulin, and urea compared with diets where Panicum maximum hay replaced part or all of the alfalfa. This indicates that legume hay supports better nitrogen status in the animal.

For sheep, protein requirements vary by stage. A dry ewe in mid-gestation needs far less protein than a ewe nursing twins. When hay protein is low, supplementation with oilseed meals or commercial protein supplements becomes necessary. In a study of lambs grazing low-quality communal rangelands, supplementation with leaf meal from Acacia dealbata maintained growth performance comparable to a commercial protein supplement, while all supplements were formulated to meet minimum maintenance protein requirements. This demonstrates that alternative protein sources can work when conventional supplements are unavailable or costly.

Fiber Fractions and Digestibility

Neutral detergent fiber (NDF) and acid detergent fiber (ADF) are the standard laboratory measures of hay fiber content. NDF represents the total cell wall content, while ADF reflects the less digestible lignin and cellulose portion. Higher fiber values generally mean lower digestibility and lower energy availability.

The physical form of fiber matters as much as the chemical measurement. Physically effective fiber stimulates chewing, rumination, and saliva production, which buffer the rumen. In feedlot diets with high proportions of forage cactus, buffel grass hay served as a source of physically effective fiber. Researchers found that including 30% buffel grass hay in the diet dry matter optimized growth performance and net income for feedlot sheep. Lower inclusion levels reduced performance, while higher levels did not improve it further.

Hay fiber also influences rumen health. Diets that are too low in effective fiber can lead to acidosis, while diets that are excessively fibrous limit intake and energy supply. The balance is particularly important when sheep are fed high-concentrate diets for finishing.

Energy Value and Intake Relationships

Energy content of hay is rarely measured directly on farm. It is usually estimated from fiber fractions or from digestibility trials. Dry matter intake increases with hay quality up to a point, then plateaus. In a study with mature Suffolk sheep fed lucerne hay cubes at intake levels from 0.4 to 1.6 times maintenance energy requirements, apparent total tract digestibility increased with dry matter intake. The proportion of metabolizable energy lost as heat production decreased as intake increased, meaning that better-fed sheep used energy more efficiently.

For practical purposes, farmers should understand that hay energy density and intake are linked. A ewe cannot eat enough low-quality hay to meet lactation energy demands because the rumen fills before energy requirements are satisfied. This is why high-producing sheep need either higher-quality hay or energy-dense concentrates.

Hay Types and Their Applications

Legume Hays

Alfalfa hay is the gold standard for sheep requiring high protein and energy. It is particularly valuable for lactating ewes, rapidly growing lambs, and breeding rams. Research on Sarda dairy sheep examined diets with higher alfalfa hay content but equal net energy, protein, and NDF levels compared with lower alfalfa diets. The study confirmed that dietary models can meet nutritional needs while preserving rumen microbiota equilibrium, which is essential for sustainable milk production.

Other legumes used in sheep feeding include clovers and vetch. Supplementing urea-treated barley straw with lucerne or vetch hays improved feed intake, digestibility, and growth in Arsi Bale sheep, according to the published record. This finding supports the practice of using legume hays to upgrade low-quality basal diets.

Legume hays carry a bloat risk, especially when fed in large amounts to hungry sheep. Introduce them gradually and ensure adequate fiber intake from grass hay or straw.

Grass Hays

Grass hays include cool-season species like timothy, orchardgrass, and ryegrass, as well as warm-season species like bermudagrass and native prairie grasses. They generally contain less protein and calcium than legumes but provide excellent fiber for rumen function.

The quality of grass hay depends heavily on cutting date. Early-cut grass hay has higher protein and lower fiber than late-cut hay. In tropical regions, native grasses often produce hay of marginal quality. A study of Nigerian sheep breeds fed Brachiaria decumbens or Digitaria smutsii hay found that sheep fed D. smutsii hay had higher intake of dry matter and crude protein than those fed B. decumbens hay. This shows that grass species selection matters even within the same general hay category.

Greenhouse gas emissions also differ among grass hays. Research with Santa Inês ewe lambs found that Braquiaria grass hay from Urochloa humidicola had the greatest potential to mitigate methane emissions compared with Tifton 85 grass hay from Cynodon species. While emissions are not a primary selection criterion for most farmers, the finding illustrates that grass species affect rumen fermentation patterns.

Cereal Hays

Oat, barley, and wheat hays are common in regions where grain crops are grown. They offer palatable fiber and moderate energy, especially when cut at the boot to early-head stage. Cereal hays can be a cost-effective option for dry ewes and replacement stock.

The main risks with cereal hay are mold, dust, and grain heads that may cause mouth irritation. Check for awns, particularly in barley and wheat hay, which can become lodged in the gums and cheeks of sheep.

Tropical and Native Grass Hays

In semi-arid and tropical regions, sheep often consume low-quality diets that fail to meet production requirements. These substandard diets, which include high-fiber feeds like straw or hay, can adversely affect feed intake, digestion, and nutrient absorption. Supplementation with high-energy and protein-rich ingredients is the standard corrective strategy.

Leucaena hay has been evaluated as a source of effective fiber and nutrients in diets containing forage palm for finishing sheep in semi-arid regions. Combining 350 to 550 g/kg of leucaena hay with 450 to 650 g/kg of forage palm in total diets with a 60:40 forage-to-concentrate ratio met nutritional requirements for a daily gain of 200 g in late-maturing sheep. This demonstrates that locally available tree legumes can substitute for conventional hays when managed properly.

Feeding Strategies by Production Stage

Dry Ewes and Maintenance

Dry ewes in early to mid-gestation have the lowest nutritional requirements of any flock class. Good-quality grass hay or mixed hay usually meets their needs without concentrate supplementation. The goal is to maintain body condition without allowing excessive fat deposition, which can cause lambing difficulties.

Offer hay free-choice and monitor body condition scores monthly. If ewes are losing condition, upgrade hay quality or begin supplementation. If they are gaining excessive condition, switch to lower-quality hay or restrict intake.

Gestating Ewes

As gestation advances, energy and protein requirements increase, particularly in the last six weeks before lambing. Ewes carrying twins or triplets have substantially higher demands than ewes carrying singles.

During late gestation, consider feeding a higher proportion of legume hay or supplementing grass hay with protein and energy concentrates. The rumen capacity of the ewe decreases as the lambs grow, so feed quality must increase to compensate for reduced intake capacity.

Lactating Ewes

Lactation is the most nutritionally demanding period in the ewe's production cycle. A ewe nursing twins can require 50% more energy and protein than her maintenance needs. High-quality legume hay is often the foundation of lactation rations because it provides both protein and energy in a form that supports high intake.

Research on dairy sheep confirmed that diets must meet nutritional needs while preserving microbiota equilibrium to produce sustainable, high-quality milk. For meat breeds, the same principle applies. Ewes that cannot consume enough nutrients will mobilize body reserves, leading to weight loss and reduced milk production.

Growing Lambs

Lambs destined for market or replacement need high-quality forage and often concentrate supplementation to achieve target growth rates. The rumen of a young lamb is still developing, and high-fiber, low-quality hay can limit intake and growth.

For finishing lambs, research has explored various forage sources. Faveira pod meal from Parkia platycephala successfully replaced Tifton-85 hay in high-concentrate diets for finishing lambs without compromising ingestive behavior or physiological parameters. Lambs fed the hay-based diet spent more time ruminating, but the pod meal diet resulted in better nutrient utilization.

By-product feeds can also replace traditional energy sources. Biscuit manufacture by-product replaced corn at up to 45% in sheep diets while maintaining similar nutritional and metabolic parameters and ingestive behavior compared with a diet containing only corn as the energy source. This illustrates the potential for cost savings when alternative feeds are available locally.

Breeding Rams

Rams need good body condition going into the breeding season. Hay quality should support maintenance plus modest weight gain. Overconditioned rams may have reduced libido and fertility, while underconditioned rams may lack stamina for the breeding season.

Feed breeding rams a balanced ration of quality hay with some concentrate during the pre-breeding period. Monitor body condition and adjust feeding accordingly.

Hay Quality Evaluation Checklist

Use this checklist when evaluating hay before purchase or before feeding. Record observations for each batch of hay so you can compare sources and track quality over time.

Visual Inspection

Check the color of the hay. Good-quality hay should be green, indicating that it was cut at the right stage and cured without excessive weathering. Brown or yellow hay may have been rained on or cut too late. Note that some bleaching on the outside of bales is normal.

Examine the leaf-to-stem ratio. Leaves contain most of the protein and energy in forage. Hay with a high proportion of leaves is higher quality than stemmy hay. This is especially important for legume hays.

Look for foreign material such as weeds, trash, wire, or plastic. Weeds can reduce palatability and may be toxic. Physical contaminants can cause hardware disease or injury.

Check for mold, which appears as white, gray, or black patches. Moldy hay can cause respiratory problems in sheep and may contain mycotoxins. Discard moldy hay instead of feeding it.

Smell the hay. Good hay has a sweet, fresh odor. Musty or sour smells indicate heating or spoilage. Hay that was baled too wet may have undergone a fermentation process that reduces feed value.

Physical Feel

Grasp a handful of hay and feel its texture. Soft, pliable hay is generally higher quality than coarse, brittle hay. Hay that crumbles easily may have lost leaves during handling.

Check for dust. Excessively dusty hay can cause respiratory issues in sheep, particularly in confined feeding situations. If dust is a problem, consider wetting the hay before feeding or using a different source.

Laboratory Analysis

Submit a representative sample to a forage testing laboratory. Sample each cutting and each field separately. Use a hay probe to collect cores from multiple bales and combine them into one sample.

Key laboratory values to request include crude protein, ADF, NDF, and dry matter. Some laboratories also offer relative feed value or relative forage quality indices that combine these measurements into a single number.

Compare laboratory results with the nutritional requirements of the sheep you plan to feed. A hay that is adequate for dry ewes may be inadequate for lactating ewes. Use the analysis to formulate supplements instead of guessing.

Records to Keep

Maintain a hay inventory log for each batch. Record the source, cutting date, forage species, laboratory analysis, bale weight, and price. Note any feeding problems observed with that batch, such as reduced intake or digestive upset.

Track body condition scores of the flock throughout the feeding period. Changes in condition indicate whether the hay program is meeting nutritional needs. Weigh lambs periodically to monitor growth rates.

Common Failure Patterns in Hay Feeding

Overestimating Hay Quality

Farmers often assume that hay looks good means it is nutritionally adequate. Visual appeal does not guarantee that protein and energy levels meet animal requirements. A hay that appears green and leafy may still be lower in protein than expected if it was cut late or fertilized poorly.

The solution is laboratory analysis. Test every new batch of hay before feeding it to animals with high nutritional demands. The cost of testing is small compared with the cost of poor animal performance.

Underestimating Intake Variability

Hay intake varies with quality, palatability, and animal size. Sheep may consume 2% to 4% of their body weight in dry matter per day, but low-quality hay reduces intake because the rumen fills before energy needs are met.

Monitor feed refusals. If sheep are cleaning up all hay within a few hours, they may not be getting enough. If large amounts are left uneaten, the hay may be unpalatable or too stemmy.

Ignoring Breed and System Differences

Sheep breeds differ in intake capacity, chewing rate, rumen pH, and bacterial composition, influenced by body size and genetics. A study of Nigerian sheep breeds found that Balami and Uda sheep had higher feed intake and blood metabolite concentrations than Yankasa sheep. Feeding programs should account for breed differences when they are known.

Production system also matters. Animals that are mobile, such as those in nomadic or grazing systems, expend considerable energy on movement and require supplementation to cover that cost. Feedlot animals have lower activity costs but may face different nutritional challenges related to high-concentrate diets.

Feeding High-Concentrate Diets Without Adequate Fiber

High-concentrate feeding systems are widely used in intensive lamb production to improve growth efficiency, but such diets may impair rumen stability and nutrient utilization. Research on lambs fed high-concentrate diets found that chromium picolinate supplementation reduced ruminal ammonia concentration, increased protozoal counts, and improved acid detergent fiber digestibility. Sodium bicarbonate supplementation had limited effects on these parameters.

For farmers feeding high-concentrate diets, the practical lesson is that rumen health requires attention. Provide some effective fiber, monitor for signs of acidosis such as reduced intake or diarrhea, and consider additives only under veterinary guidance.

Using Cactus or Succulent Feeds Without Adequate Dry Forage

In semi-arid regions, forage cactus is a valuable water source for sheep, but feeding it exclusively can cause nutritional disorders, especially diarrhea. Research found that buffel grass hay inclusion reduced contamination by bacteria that cause diarrhea and depressed animal performance. At 45% buffel grass hay inclusion, diarrhea was not observed, while lower levels allowed diarrhea to occur.

The practical implication is that succulent feeds must be balanced with dry, fibrous feeds to maintain normal digestive function. Do not feed cactus or similar succulent forages as the sole forage source.

Welfare and Safety Considerations

Respiratory Health

Dusty or moldy hay can cause respiratory disease in sheep, particularly when fed in confined spaces. Ensure adequate ventilation in barns and feeding areas. Consider soaking or steaming dusty hay before feeding, but be aware that soaking leaches nutrients.

Bloat Prevention

Legume hays, especially alfalfa, can cause bloat in sheep. Introduce legume hay gradually over several days. Provide access to grass hay or straw to dilute the legume content. Monitor sheep closely for signs of bloat, including abdominal distension and distress.

Parasite Management

Hay feeding practices affect parasite exposure. Feeding hay in racks or troughs reduces contamination compared with feeding on the ground. In a study of lambs grazing communal rangelands, dietary supplementation did not affect fecal worm egg counts or FAMACHA scores, indicating that supplementation alone does not control parasites. Maintain a comprehensive parasite management program that includes monitoring, targeted treatment, and pasture management.

Mycotoxin Risk

Moldy hay may contain mycotoxins that cause a range of health problems, from reduced intake to immune suppression. Do not feed visibly moldy hay. If mycotoxin contamination is suspected, consult a veterinarian or feed testing laboratory.

Worker Safety

Hay handling involves heavy lifting and equipment operation. Use proper lifting techniques and mechanical equipment where available. Store hay securely to prevent bales from falling. Keep feeding areas clean to reduce slip and fall hazards.

Professional Escalation Criteria

Contact a veterinarian or animal nutritionist when you observe any of the following:

• Multiple sheep showing signs of digestive upset, including diarrhea, bloat, or reduced intake, after a hay change
• Body condition scores declining despite adequate hay availability
• Lamb growth rates below targets for more than two consecutive weighings
• Ewes failing to conceive or experiencing high embryonic loss
• Signs of nutritional deficiency, such as poor wool quality, weak lambs, or metabolic disease
• Suspected mycotoxin contamination or plant toxicity in hay
• Unexplained deaths or illness that could be feed-related

A veterinarian can help diagnose feed-related problems and recommend corrective actions. A nutritionist can formulate balanced rations using your hay analysis and available feed ingredients.

Frequently Asked Questions

How much hay does a sheep eat per day?

A mature sheep typically consumes 2% to 4% of its body weight in dry matter daily, depending on hay quality, production stage, and environmental conditions. A 70 kg ewe might eat 1.5 to 2.5 kg of hay dry matter per day. Low-quality hay reduces intake because the rumen fills before energy requirements are met. Weigh feed offered and refused to determine actual intake on your farm.

Can sheep eat only hay without grain?

Yes, sheep can survive on hay alone, but production will be limited by hay quality. Dry ewes in early gestation can be maintained on good-quality grass hay. Lactating ewes and growing lambs usually need higher-quality legume hay or concentrate supplementation to meet their energy and protein requirements. Low-quality hay alone will not support growth, lactation, or reproduction.

What is the best hay for sheep?

The best hay depends on the production stage. Alfalfa or other legume hays are best for lactating ewes, growing lambs, and breeding rams because of their high protein and energy content. Grass hays are suitable for dry ewes and maintenance rations. Mixed grass-legume hays offer a balance of protein and fiber with lower bloat risk. Match hay quality to the most demanding animals in the flock.

How can I tell if hay is good quality without a lab test?

Visual inspection provides clues but cannot replace laboratory analysis. Good hay is green, leafy, soft, and free of mold, weeds, and foreign material. It should smell sweet and fresh. Late-cut hay is stemmier and lower in quality than early-cut hay. However, visual assessment can be misleading, so submit samples to a forage testing laboratory for accurate protein and fiber values.

Should I feed alfalfa hay to sheep?

Alfalfa hay is excellent for sheep with high nutritional demands, including lactating ewes, growing lambs, and breeding rams. It provides more protein and calcium than grass hays. The main risk is bloat, especially when sheep are introduced to alfalfa suddenly or fed it as the sole forage. Introduce alfalfa gradually and provide some grass hay or straw to reduce bloat risk.

Can sheep eat moldy hay?

No, do not feed moldy hay to sheep. Mold can cause respiratory problems, reduced intake, and mycotoxin toxicity. Some molds produce toxins that damage the liver, immune system, or reproductive performance. Discard moldy hay and investigate the cause, such as baling at excessive moisture or poor storage conditions.

How should I store hay to maintain quality?

Store hay in a dry, well-drained area with good air circulation. Keep bales off the ground on pallets or gravel to prevent moisture wicking. Cover stacks with tarps or store in a barn to protect from rain and snow. Proper storage prevents mold growth and nutrient loss. Feed older hay first to minimize storage losses.

What supplements are needed with low-quality hay?

Low-quality hay, such as mature grass hay or straw, requires supplementation with energy and protein sources. Common supplements include grain, oilseed meals, commercial protein supplements, and legume hay. Research has shown that locally available feeds such as Acacia leaf meal, leucaena hay, and biscuit by-product can effectively supplement low-quality forages. Have your hay tested and formulate supplements to meet the specific nutrient gaps.

Related Farming Guides

• Hay for Rabbits: Selection, Storage, and Feeding-System Design
• Cervid Winter Feeding Strategies: Hay, Silage, and Supplementation
• Chicken Feed Options: Types, Nutrition, and Feeding Strategies
• Sheep Feeders: Types, Selection, and Management for Flock Nutrition
• Hay Testing for Sheep Flocks: Reading Results Before Feeding

References and Further Reading

• FAO Animal Production and Health. Food and Agriculture Organization of the United Nations.
• Animal Health and Welfare. USDA National Agricultural Library.
• Animal and Veterinary Resources. U.S. Food and Drug Administration.
• Animal Health and Welfare. World Organisation for Animal Health.
• Animal Production and Protection. USDA Agricultural Research Service.
• Nutrient Utilization and Requirements in Sheep and Goats Raised Under Different Systems and Fed Low Nutritional Novel Feeds for Meat Production.. Animals : an open access journal from MDPI, 2025.
• Serum metabolites, ruminal parameters and feed intake of three breeds of Nigerian sheep as affected by hay feeding.. Tropical animal health and production, 2025.
• By-product from biscuit manufacture as corn replacements in sheep diets: nutritional and metabolic traits.. Tropical animal health and production, 2025.
• The effect of leucaena hay as a source of effective fibre and nutrients in diets with forage palm for finishing sheep in semi-arid regions.. Animal science journal = Nihon chikusan Gakkaiho, 2021.
• 16S rRNA gene amplicon sequencing for microbiota analysis of rumen fluid, feces, and milk of Sarda sheep fed different contents of alfalfa hay (Medicago sativa).. Journal of dairy science, 2025.
• Greenhouse gases emissions and energy efficiency in ewe lambs fed hay from native Pantanal grasses.. Tropical animal health and production, 2025.
• Supplementation of Acacia dealbata versus Acacia mearnsii leaf-meal has potential to maintain growth performance of lambs grazing low-quality communal rangelands in South Africa.. Tropical animal health and production, 2024.
• Energy metabolism by splanchnic tissues of mature sheep fed varying levels of lucerne hay cubes.. Animal : an international journal of animal bioscience, 2013.
• Determining the optimal level of buffel grass hay as a source of physically effective fiber in a diet with high proportions of forage cactus for sheep finished in the feedlot.. 2026.
• Growth and profitability of Arsi-Bale rams using &lt,i&gt,Brachiaria mutica&lt,/i&gt, hay and strategic concentrate supplementation.. 2026.
• Parkia platycephala pod meal as a total replacement for Tifton-85 hay in high-concentrate diets for lambs: ingestive behavior, physiological, and metabolic parameters.. 2026.
• Effects of combined chromium picolinate and sodium bicarbonate supplementation on growth performance, rumen fermentation, nutrient digestibility, protozoal population, and carcass traits in lambs fed high-concentrate diets.. 2026.
• Digestibility, rumen fermentation, and blood metabolites of Barki rams fed Panicum maximum cv. Mombasa hay as a substitute for alfalfa hay, with or without spirulina.. 2026.
• Early-Life Behavioral Time Budgets of a Local Dairy Sheep Breed in Indoor and Pasture Systems. 2026.
• Feeding different proportion of oat silage in feedlot diets: effects on rumen function and meat quality of Tibetan sheep.. 2026.
• Microbiological Composition of Diets of Cactus Pear-Based with Increasing Levels of Buffel Grass Hay and Relationship to Nutritional Disorders in Sheep. Animals, 2022.
• Nutritional Evaluation of Sesbania Sesban Hay in the Ration of Sheep. 1999.
• Growth Respons of Javanese Fat Tail Sheep (DEG) on Probiotic Supplementation in Diet with Different Nitrogen Source. JURNAL BIOLOGI TROPIS, 2023.
• Effect of supplementing urea-treated barley straw with lucerne or vetch hays on feed intake, digestibility and growth of Arsi Bale Sheep. Tropical Animal Health and Production, 2009.
• Densities of Ruminal Protozoa of Sheep Established Under Different Dietary Conditions. Journal of Dairy Science, 1969.

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