Abstract
Pregnant cows were administered 13-carotene and vitamin A in feed for 8 weeks before parturition, and the blood and milk of cows and blood of newborn calves were examined for the druglevels. In cows given β-carotene alone its serum and colostrum level markedly increased, and newborn calves showed markedly increased levels of serum, 8-carotene and vitamin A. Those given both carotene and vitamin A, showed high levels of serum vitamin A, showing no increased levels of serum retinylpalmitate. The results suggested that an administration of β-carotene alone in feed was effective in utilization of both carotene and vitamin A in cows, whereas combined administration of β-carotene and vitamin A had poor effect.
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