Utilization of Vit. A and Carotene by Normal and Deficient Sheep.

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Abstract
Hepatic vitamin A storage and changes in plasma vitamin A levels were measured in vitamin A normal and deficient sheep following intra-ruminal administration of [beta]-carotene, vitamin A alcohol and acetate. Animals administered vitamin A alcohol stored more hepatic vitamin A than those treated with [beta]-carotene or vitamin A acetate. Further, vitamin A normal animals, on administration of [beta]-carotene and vitamin A alcohol, stored more hepatic vitamin A than did similarly treated deficient animals. Plasma vitamin A levels increased within 6 hours and 18 hours following vitamin A alcohol and [beta]-carotene administration respectively. The vitamin A alcohol treated animals exhibited a maximum plasma vitamin A level at 18 hours post treatment while those treated with [beta]-carotene responded with a slower more sustained plasma vitamin A content. Comparable plasma vitamin A concentrations were obtained in both normal and deficient sheep when treated with vitamin A alcohol. Also, similar plasma levels were obtained when vitamin A alcohol and vitamin A acetate were compared. On the other hand, deficient sheep treated with [beta]-carotene possessed a lower plasma vitamin A level than similarly treated normal animals.

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