Is your hay supplying enough Vitamin A for this winter?
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By Erin Laborie, Nebraska Extension Livestock Educator Vitamin A plays a critical role in young calf health. Calves are born with very limited vitamin A stores because little transfers from the cow during gestation. Newly born calves rely heavily on colostrum for their supply of vitamin A, making the cow’s late-gestation diet critically important. For most herds calving in late winter or spring, cows are fed stored or stockpiled forages during their last trimester. Recent research suggests that late gestation cows need 75,000 to 90,000 IU/d of vitamin A, but the amount of vitamin A in hay varies widely. Factors such as forage type, maturity at harvest, haying and storage conditions, as well as how long hay has been stored influence vitamin A levels. This can mean supplementation needs range from none at all to nearly the full requirement coming from a supplement.