Effects of Vitamin A and Carotene Intake on Depletion Time of Young Dairy Calves

No extra vitamin A 711No extra vitamin A 1 Only 41 calves are listed, since 8 died before they were 90 days old, 2 died before they were depleted and 1 was slaughtered.Obviously it would be advantageous to express the total carotene and the vitamin A intake in terms of International units.The carotene intake was converted to I.U.by using the figure 0.6 7 of carotene as 1 I.U.Micrograms of vitamin A were converted to I.U.by multiplying by four.The total vitamin intake, including the carotene, is expressed in I.U.per lb. of average body weight for the-first 90 days.