586 



IX. CAROTENOIDS AND VITAMINS A 



carotene for dairy coavs during lactation was adequate to increase liver 

 stores and plasma levels of vitamin A. 



Table 11 

 Estimates of the Vitamin A Requirement of Cattle" 



" F. H. Mattson, Requirements of Animals, in W. H. Sebrell, Jr., and R. S. Harris, 

 The Vitamins, Vol. I, Academic Press, New York, 1954, p. 168. 



^ J. M. Lewis and L. T. Wilson, J. Nutrition, 30, 467-475 (1945). 



' H. A. Keener, S. I. Bechdel, N. B. Guerrant, and W. T. S. Thorp, J. Dairy Set., 25, 

 571-583 (1942). 



-^ H. R. Guilbert, C. E. Howell, and G. H. Hart, /. Nutrition, 19, 91-103 (1940). 



" J. H. Jones, J. K. Riggs, G. S. Fraps, J. M. Jones, H. Schmidt, R. E. Dickson, P. E. 

 Howe, and W. H. Black, Proc. Am. Soc. Animal Production, 31, 94-102 (1938). 



/ L. L. Madsen, O. N. Eaton, L. Heemstra, R. E. Davis, C. A. Cabell, and B. Knapp, 

 /. Animal Sci., 7, 60-69 (1948). 



» L. A. Moore, J. F. Sykes, W. C. Jacobson, and H. G. Wiseman, /. Dairy Set., 31, 533- 

 538 (1948). 



^ P. D. Boyer, P. H. Phillips, N. S. Lundquist, C. W. Jensen, and I. W. Rupel, J. 

 Dairy Sci., 25, 433-440 (1942). 



» A. H. Kuhlman and W. D. Gallup, /. Dairy Sci., 25, 688-689 (1942). 



' J. K. LoosU, C. F. Huffman, W. E. Petersen, and P. H. Phillips, Reconmiended Nu- 

 trient Allowances for Domestic Animals, III, Reconmiended Nutrient Alloivances for Dairy 

 Cattle, Comm. Animal Nutrition, Nat. Research Council (U.S.), Washington, 1950, pp. 

 1-30. 



* H. H. Guilbert, P. Gerlaugh, and L. L. Madsen, Recommended Nutrient Allowances 

 for Domestic Animals, IV. Recommended Nutrient Alloivances for Beef Cattle, Comm. 

 Animal Nutrition, Nat. Research Council (U.S.), Washington, 1945, pp. 1-32. 



In the case of non-lactating female cattle and males, different levels of 

 vitamin A intake, from 32 to 220 I.U. /kg. body weight per day have been 



