Nov., 1938] Vitamin A Requirements of Growing Chicks 23 



7. The New England College Conference ration (1932-33) contains 

 sufficient vitamin A to prevent opthalmia and produce sufficient growth 

 up to 12 weeks of age without the addition of vitamin A through the 

 medium of cod liver oil. 



8. Sardine oil and cod liver oil as used in these experiments when fed 

 at 1/2 or 1% levels with a ration otherwise deficient in vitamin A sup- 

 plied sufficient vitamin A to prevent the occurrence of vitaminosis A. 



9. Somewhat more rapid growth was secured in the cod liver oil fed 

 groups as compared to the sardine oil fed groups. 



10. An increased vitamin A consumption tends to increase total feed 

 consumed. 



11. For rapid growth chicks with a normal storage of vitamin A upon 

 hatching need during the first five-week period a total intake of approxi- 

 mately 134.4 international units of vitamin A per 100 grams of feed. 

 Following this initial growth period the demands for vitamin A are in- 

 creased to approximately 400 units per 100 grams of feed. 



Selected References 

 1 — Beach, J. R.: Studies on a Nutritional Disease of Poultry Caused by Vitamin A 



Deficiency; Calif. Agr. Exp. Sta. B'ull. 378. 1924. 

 2 — Beaudette, F. R.: Vitamins and Their Relation to Poultry Diseases; N. J. 



Hints to Poultrymen, Vol. 12, No. 2, Nov., 1923. 

 3— Cruickshank, Ethel M., Hart, E. B. and Halpin, J. G.: The Vitamin A and D 

 Content of Cod Liver Meal; Poultry Science, Vol. 7, pp. 9-16, 

 1927. 

 4— Davis, D. E. and Beach, J. R. : A Study of the Relative Value of Certain Root 

 Crops and Salmon Oils as Sources of Vitamin A for Poultry; 

 Bull. 412, University of California, 1926. 

 5 — Guilbert, H. R.: The Determination of Carotene as a Means of Estimating 

 the Vitamin A Value of Forage, Ind. Eng. Chem., Nov. 15, 1934. 

 6— Hart, E. B., Steenbock, H., Halpin, J. G. and Johnson, O. N.: New Chick Feed- 

 ing Facts; Wisconsin Agr. Exp. Sta. Bull. 371, 1924. 

 7— Hauge, S. M., Carrick, W. C. and Prange, R. W.: Fat Soluble A Requirements 



for Growing Chicks; Poultry Science, Vol. 6, pp. 135-140, 1926. 

 8— Holmes, A. D., Tripp, Francis and Campbell, P. A.: The Vitamin A Reserve 

 of Embryo and Baby Chicks; Journal of Nutrition, Vol. 11, No. 

 2, Feb., 1936. 



9— Vitamin A Storage by Chickens; Poultry Science, Vol. 15, 



No. 1, pp. 71-77, 1936. 

 10— Lyman, F. J.: Vitamins; Bulletin 54, Ohio State University. 1930. 

 11— Miller, M. W. and Bearse, G. E.: A Comparison of Some Vitamin A Supple- 

 ments for Chick Feeding; Wash. Agr. Exp. Station Bull. 292 

 1934. 

 12— Mitchell, H. H., Kendall, F. E. and Card, L. E.: The Vitamin Requirements of 



Growing Chicks; Poultiy Science, Vol. 2, pp. 117-124. 1922. 

 13— Sherwood, R. M., and Fraps, G. S.: The Quantities of Vitamin A Required by 

 Pullets for Maintenance and for Egg Production; Texas Agr. 

 Exp. Station Bull. 468, Dec, 1932. 

 14 — The Amount of Vitamin A Potency Required by Hens for Egg 



Production; Texas Agr. Exp. Sta. Bull. 493, August, 1934. 



15 — The Quantities of Vitamin A Required by Growing Chicks • 



Texas Agr. Exp. Sta. Bull. 528, 1936. 

 16— Steenbock, H. and Bbutwell, P. W.: The Comparative Nutritive Value of 

 White and Yellow Maizes; Jour. Biol. Chem., Vol 41 n 81 

 1920. ' 



I''— Tepper, A. E.: Vitamin A Requirements of Battery Raised Chicks; Abstract 

 24th Annual Meeting Poultry Science Assn., 1932, 



18 An Individual Chick Cage for Poultrj^ Nutrition Studies; Poultry 



Science, Vol. 17, No. 6, November, 1938. 



