Abstract
Summary Blood plasma, liver, and milk fat analyses for carotene and vitamin A in Jersey and Holstein cows on normal and suboptimal carotene rations were compared. Suboptimal carotene rations fed prenatally and over long periods of time after birth resulted in low liver vitamin A and carotene values, which failed to respond to carotene supplementation as high as 330 γ per kilogram of body weight. Repeated injections every 5 days of either 250,000 or 1,250,000 I.U. of vitamin A ester failed to result in any appreciable increase of liver vitamin A or carotene in cows on a suboptimal carotene ration.
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