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5 Tips for Feeding Lactating Mares
By Kristen M. Janicki
Do you get tired just watching your new foal gallop around his pasture? Try supplying him with enough energy and nutrition to allow him to frolic and play all day! Lactation is one of the most physiologically demanding stages for broodmares. Their nutritional requirements increase drastically in order to maintain weight while providing nursing foals with enough critical nutrients.
5 Tips for Feeding Lactating Mares
Lactating mares have the highest nutrient requirements during the first three months of lactation. These requirements decrease as their milk production decreases—in both quantity and quality—during the fourth through sixth months post-foaling.
If a lactating mare's diet is restricted, she will sacrifice her own calorie, protein, and mineral stores for milk production. In severe cases an undernourished broodmare can suffer weight, muscle tone, and bone loss. Thus, it's crucial to provide lactating mares with enough feed to sustain both themselves and their growing foals.
Here are five tips for meeting mares' nutritional needs during lactation:
1. Go with Grain. Although high-quality hay and/or grass should remain the basis of the diet, in most cases forage alone cannot meet lactating mares' nutritional requirements. Grain products formulated for broodmares are designed to meet pregnant and lactating mares' nutritional needs. Follow the feeding rates suggested on the tag or bag corresponding to the month of lactation.
2. Split it up. Many mares in the first three months of lactation will require between 10 to 15 pounds of a commercial grain mix per day to meet their increased nutrient requirements. Dividing this into two or three meals per day can help reduce the risk of digestive upset and increase nutrient digestion and absorption.
3. Building Blocks. High-quality protein is vital to delivering essential amino acids to the foal. Thus, the mare's dietary requirements for lysine, the first limiting amino acid in growth and development, increase from about 38 grams per day in late pregnancy to 85 grams per day in early lactation for an average 1,100 pound mare. When choosing a grain mix, check the feed tag and ingredient list to ensure they include guaranteed levels of lysine.
4. Can I have some? Most foals will begin to nibble on their mare’s grain within weeks of birth and can easily consume up to four pounds each day by the time weaning approaches. 
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