REQUIREMENT FOR VIT.\MI\.S D 677 



In the case of turkey's, a diet containing 400 A.O.A.C. International 

 chick units of vitamin D per pound of feed is recommended for turkey 

 poults, for growing turkeys, and also for breeding turkeys.^*^ 



b. Swine and Dairy Cattle. The recommended amounts of vitamin D 

 for swine and for dairy cattle are based upon the weight of the animal. 

 These figures are summarized in Table S.^''^'^*^ 



Table 8 



Recommended Daily Allowances of Vitamin D for Swine 



(Market Stock and Breeding) and for Dairy Cattle (Heifers) 



According to Weight"'' 



" Adapted from Nat. Research Council, Comm. Animal Nutrition, Nutrient Require- 

 ments for Domestic Animals, No. 2. Nutrient Requirements for Swine (revised 1953); 

 and No. 3. Recommended Nutrient Allowances for Dairy Cattle (revised 1950). 



* Adapted by J. H. Jones, Vitamin D. Group. VIII. Requirements of Animals, in 

 W. H. Sebrell, Jr., and R. S. Harris, The Vitamins, Vol. II, 253-256 (1953). 



c. Other Species. Beef cattle usually receive enough ^•itamin D through 

 irradiation of the skin by sunlight while they are on the range. Jones, ^^^ 

 and Bechtel et al.,^^^ found that the requirement for young beeves approxi- 

 mated 300 I.U. of vitamin D/lOO lb. live weight. Sheep and horses also 

 spend a considerable proportion of their time on the range, and do not 

 require supplementary vitamin D. When lambs are away from sunlight, 

 250 to 300 I.U. of \atamin D per 100 lb. body weight are recommended. 

 It is also suggested that horses kept indoors be given supplements of 300 



3M H. E. Bechtel, E. T. Hallman, C. F. Huffman, and C. W. Duncan, Mich. Agr. Exptl. 

 Sta. Tech. Bull. No. 150(1936). 



