Feeding Lambs

Getting nutrition right during those first critical months determines whether your lambs reach their genetic potential or fall short despite having every other advantage. A lamb's growth rate during the nursing period and immediately after weaning sets patterns that affect their entire productive life, influencing everything from eventual body size to reproductive maturity timing. Poorly fed lambs do not just grow slowly during the restriction period, they often never fully catch up even when given excellent nutrition later. Understanding what lambs need at different ages and how to provide it efficiently makes the difference between lambs that thrive and lambs that merely survive.

The nutritional requirements of lambs change dramatically as they develop from newborns dependent entirely on milk to ruminants capable of utilizing forage and grain. Newborn lambs have a digestive system that functions like a simple-stomached animal, digesting milk in the abomasum without significant rumen activity. Over the first few weeks, as lambs begin nibbling at solid feed, their rumen develops the microbial populations needed to ferment fiber and produce the volatile fatty acids that will eventually supply most of their energy. This transition period requires careful management because lambs need nutrients they cannot yet efficiently extract from adult sheep feeds.

Your feeding strategy should account for your production goals because lambs destined for different purposes have different optimal growth curves. Market lambs heading to slaughter benefit from maximum growth rates that get them to target weights quickly, justifying higher inputs to achieve rapid gains. Replacement ewe lambs need steady growth that supports skeletal development without excessive fattening that could impair future reproduction. Ram lambs being raised as potential breeding stock require nutrition that supports proper development without the metabolic stresses that maximum growth rates sometimes create. One feeding program does not fit all purposes.

This article covers the practical aspects of lamb nutrition from birth through weaning and beyond, giving you the information needed to make feeding decisions that match your goals, resources, and management system. You will learn what colostrum does and why those first hours matter so much, how to introduce creep feed effectively, when and how to wean for best results, and how to avoid the nutritional mistakes that cause problems ranging from poor growth to fatal diseases.

Colostrum, the first milk produced by ewes after lambing, provides far more than simple nutrition and represents the most critical feeding your lambs will ever receive. Colostrum delivers concentrated antibodies that provide passive immunity against diseases the lamb's immature immune system cannot yet fight independently. Without adequate colostrum intake during the first 24 hours of life, lambs remain vulnerable to infections that stronger-started lambs resist easily. The antibodies can only be absorbed through the intestinal wall during a narrow window that closes around 24 hours after birth, making timing as important as quantity. Every lamb needs at least 10 percent of its body weight in colostrum during those first critical hours, which means about one pound for a ten-pound lamb.

Ensuring colostrum intake requires attention during and immediately after lambing. Strong lambs from uncomplicated births usually nurse on their own within the first hour, but you should confirm suckling actually occurred rather than assuming. Weak lambs, those from difficult births, triplets or quads competing for limited teats, and lambs from ewes with poor udder conformation may need assistance. Having frozen colostrum available from earlier lambings or commercial colostrum replacer products lets you supplement when ewe colostrum is insufficient. Warm colostrum to body temperature before feeding, and use a stomach tube if lambs are too weak to suckle from a bottle, because getting that colostrum in matters more than how it gets there.

After the colostrum period, lambs depend on ewe milk as their primary nutrition for the first three to four weeks of life. Milk production varies considerably between ewes based on genetics, body condition, age, and nutrition, with high-producing ewes supporting faster lamb growth than ewes giving less milk. Twins and triplets divide whatever milk their dam produces, which is why single lambs often grow faster than multiples during the nursing period. Ensuring ewes receive adequate nutrition during lactation, particularly protein and energy to support milk production, directly affects lamb growth rates even though you are feeding the ewes rather than the lambs directly.

Creep feeding provides supplemental nutrition that lambs can access while still nursing, supporting growth beyond what milk alone allows and preparing the digestive system for weaning. A creep feeder uses barriers that allow small lambs to enter while excluding adult sheep, giving lambs exclusive access to high-quality feed. Lambs typically begin showing interest in solid feed around two to three weeks of age, though significant intake often does not begin until three to four weeks. Start with small amounts of fresh, palatable feed and increase gradually as consumption rises. The rumen development stimulated by creep feeding produces lambs that transition to weaning smoothly rather than experiencing growth setbacks.

Creep feed formulation balances nutrient density with rumen health considerations. Commercial lamb creep feeds are formulated to provide high energy and protein appropriate for young, fast-growing animals while including appropriate fiber levels to promote healthy rumen development. Whole grains are often preferred over finely ground feeds because the larger particle size encourages chewing that produces saliva, buffering the rumen against acidosis. Adding a coccidiostat to creep feed prevents coccidiosis outbreaks that commonly affect young lambs grouped together in creep areas. Quality hay or access to pasture alongside grain provides the fiber needed for rumen function.

Daily creep feeder management affects both intake and health outcomes. Check feeders daily to ensure feed remains fresh and palatable, because lambs readily reject feed that has become stale, wet, or contaminated with feces. Clean feeders regularly, removing any accumulated fines or spoiled feed that lambs push aside. Adjust the amount offered based on consumption, providing enough that lambs can eat freely without leaving large amounts that go to waste. Monitor the creep area for dampness or manure accumulation that could promote disease transmission among the lambs congregating there.

Observing lamb condition and growth helps you evaluate whether your feeding program is working. Lambs growing well show rounded, full bellies without being potbellied, which can indicate parasites or nutritional problems rather than good nutrition. Their coats appear healthy and growth over time matches expectations for your breed and production system. Lambs falling behind their siblings despite adequate milk and creep access may have health issues requiring attention. Periodic weighing, even if just approximate weights using a hanging scale and sling, gives you objective data rather than relying on visual assessment alone.

Water access matters more than some producers realize, particularly for lambs consuming dry feed. Even nursing lambs need fresh water available, and water intake increases dramatically as solid feed consumption rises. Position water sources where lambs can easily reach them, considering that very young lambs cannot drink from tall troughs designed for adult sheep. Clean and refill water containers daily during warm weather when contamination and evaporation both occur rapidly. Dehydration reduces feed intake and impairs growth even when excellent feed is available.

Weaning timing and method significantly affect lamb stress and growth. Gradual weaning where lambs have already been consuming significant amounts of solid feed before separation from ewes produces less growth disruption than abrupt weaning of lambs dependent primarily on milk. Most producers wean lambs between 60 and 90 days of age, though exact timing depends on lamb weights, ewe condition, and management goals. Fence-line weaning, where lambs and ewes can see and hear each other through a fence but cannot nurse, reduces stress compared to complete separation that removes all contact.

Coccidiosis represents one of the most significant health threats to young lambs in confinement or semi-confinement situations where fecal contamination accumulates. The protozoan parasites that cause this disease multiply in the intestinal lining, causing bloody diarrhea, dehydration, weight loss, and sometimes death in severe cases. Lambs around three to eight weeks old face the highest risk, particularly when crowded conditions expose them to heavy parasite loads before they develop immunity. Adding coccidiostats like decoquinate or lasalocid to creep feed provides continuous low-level prevention far more effectively than treating clinical outbreaks after damage has occurred.

Enterotoxemia, often called overeating disease, poses serious risk to fast-growing lambs consuming grain, and prevention requires vaccination rather than relying on feeding management alone. The Clostridium bacteria responsible already live in the intestines of healthy lambs, but grain consumption creates conditions that trigger explosive bacterial growth and toxin production. Death often occurs within hours of any observable symptoms. All lambs should receive CDT vaccine, with the initial dose around four to six weeks and a booster three to four weeks later. Even vaccinated lambs can develop enterotoxemia if grain intake increases too rapidly, so gradual feed transitions matter regardless of vaccination status.

Urinary calculi, also known as water belly, affects male lambs fed high-grain diets when mineral imbalances cause stones to form in the urinary tract. Blocked males cannot urinate, and without treatment the condition is fatal. Prevention focuses on maintaining proper calcium to phosphorus ratios in the diet, typically aiming for ratios of two to one or higher, along with adding ammonium chloride to acidify the urine and dissolve forming stones. Adequate water intake helps flush the urinary tract. Wether lambs intended for market face the highest risk because castration creates a narrower urinary tract more easily blocked than intact males.

Diarrhea in young lambs requires immediate attention because dehydration can kill quickly. Multiple causes produce similar symptoms, including bacterial infections, viral diseases, coccidiosis, and nutritional problems like milk replacer mixed too concentrated. Isolate affected lambs, provide electrolyte solutions to replace fluids and minerals, and try to identify the underlying cause to prevent spread to other lambs. Very young lambs with diarrhea often need veterinary intervention because they deteriorate rapidly. Preventing diarrhea through cleanliness, proper nutrition, and disease management protects lambs better than treating cases after they develop.

Growth potential varies significantly between sheep breeds, affecting both how much lambs can reasonably consume and what growth rates you should expect. Terminal sire breeds like Suffolk, Hampshire, and Texel produce lambs genetically programmed for rapid muscle development and efficient feed conversion. These lambs benefit from high-energy feeding programs that allow them to express their genetic potential, reaching market weights quickly when properly fed. Pushing maximum growth in breeds without similar genetic capacity wastes feed on fat deposition rather than lean gain.

Maternal breeds and dual-purpose sheep grow more slowly than terminal breeds but may be more efficient on lower-input diets. Breeds developed for survival in harsh environments often utilize forage more effectively and tolerate nutritional fluctuation better than highly selected meat breeds. Raising lambs from these breeds on intensive feeding programs designed for terminal crosses often produces disappointing results and excess fat deposition. Matching your feeding strategy to your breed's genetic potential makes economic sense and produces lambs with appropriate condition for their purpose.

Hair sheep breeds generally mature earlier and at lighter weights than wool breeds, which affects both growth targets and feeding duration. Katahdin and similar breeds may reach market condition at weights that would indicate unfinished lambs in a Suffolk cross. Their earlier maturity means they begin depositing fat at lighter weights if pushed to grow beyond their frame development. Adjusting target weights and feeding intensity for these breeds prevents over-finishing while still achieving desired condition.

Replacement ewe lamb feeding should prioritize frame development over maximum weight gain because overly fat yearlings often have reproductive problems. Moderate growth that supports skeletal development and proper body condition without excessive fattening produces ewes that breed earlier, conceive more reliably, and have fewer lambing difficulties. Different breeds reach breeding maturity at different ages and weights, so replacement feeding programs should account for your specific breed's developmental timeline rather than applying one standard to all sheep types.

The most common and dangerous feeding mistake with lambs is introducing grain too rapidly, which triggers enterotoxemia that kills before you realize anything is wrong. A lamb that has never eaten grain cannot safely consume large amounts suddenly, regardless of how hungry it is or how eagerly it eats. Every increase in grain feeding should happen gradually over at least seven to ten days, allowing the rumen microbial population to adjust to the new substrate. This applies to starting creep feed, increasing creep amounts, and transitioning to post-weaning diets. The lamb that gorges on grain after a period without access faces the highest risk, which is why consistent daily feeding matters more than the absolute amount offered.

Neglecting colostrum management kills lambs through infections that adequate passive immunity would have prevented. Assuming lambs nursed without confirming it, missing lambs from multiple births that failed to compete for teats, and failing to supplement when ewes produce insufficient colostrum all leave lambs vulnerable. The consequences often appear days or weeks later as pneumonia, joint infections, or septicemia in lambs whose immune systems never got properly started. Every lamb needs to receive adequate colostrum within that 24-hour window, and making this happen requires attention during the busiest, most exhausting period of your lambing season.

Providing inadequate nutrition to ewes during lactation starves lambs even when you think you are feeding them through creep. A ewe without enough energy and protein to support milk production gives less milk, and young lambs before significant creep intake depend almost entirely on that milk. The cheapest way to grow lambs during the nursing period is often better ewe nutrition rather than more expensive creep feed, because milk is incredibly efficient nutrition for young lambs. Skimping on lactating ewe feed to save money costs more than it saves through reduced lamb growth.

Ignoring water quality and availability assumes lambs will find enough water somewhere without your active management. Young lambs may not drink from sources designed for adult sheep if they cannot reach them or feel unsafe approaching them. Dirty water reduces intake even when quantity seems sufficient. During hot weather, water intake must increase dramatically or growth suffers. Providing clean, accessible water sources specifically considering lamb needs, not just assuming the flock water setup works for everyone, supports the feed intake that drives growth.

Continuing to feed the same ration after needs change wastes either nutrients or growth potential depending on the direction of the mismatch. Lambs approaching market weight depositing fat rather than lean gain convert expensive feed into product worth less per pound. Replacement ewe lambs on market lamb rations become overly fat and experience reproductive problems. Lambs transitioning from nursing to post-weaning need different nutrition than fully weaned lambs on finishing diets. Evaluating and adjusting your feeding program as lambs develop matches nutrition to needs rather than applying one solution to changing situations.

Failing to prevent coccidiosis until clinical disease appears costs you growth even in lambs that survive. Subclinical infection damages the intestinal lining enough to reduce nutrient absorption without producing the bloody diarrhea that signals obvious disease. By the time you see clinical coccidiosis, the entire lamb group has likely been affected, and treatment addresses acute symptoms without recovering the growth already lost. Preventive coccidiostat use in creep feed costs far less than the growth reduction and treatment expenses of clinical outbreaks, making prevention clearly the better economic choice.