. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS Typical carotenoid plasma levels for new-born cattle of any breed are 22-50 ( ml. ^^^'^^^ but breed differences become obvious within eight days of birth. ^ ^ ^ Colostrum and Milk As in the case of humans the colostrum of cows is very rich in carotene, i o e, 11 o, 121,13 6 ^phe pre-nursing value of colostrum is between 5-10 times higher than that of seventh-day milk when calculated on the whole fluid, and three times higher when measured on the fat basis. ^^9,13 3 Dann^^^ had previously reported greater diffe
. Carotenoids, their comparative biochemistry. Carotenoids. CAROTENOIDS Typical carotenoid plasma levels for new-born cattle of any breed are 22-50 ( ml. ^^^'^^^ but breed differences become obvious within eight days of birth. ^ ^ ^ Colostrum and Milk As in the case of humans the colostrum of cows is very rich in carotene, i o e, 11 o, 121,13 6 ^phe pre-nursing value of colostrum is between 5-10 times higher than that of seventh-day milk when calculated on the whole fluid, and three times higher when measured on the fat basis. ^^9,13 3 Dann^^^ had previously reported greater differences between colostrum and late milk, and claimed that heifers produced colostrum richer in (vitamin A) than did cows. Recently it has been shown that the carotene content of the first successive 2 lb. samples of colostrum increases considerably, ^ ^' that interruption of milking increases the concentration of carotene in the milk but does not alter the 3-day yield, ^ ^« that vitamin E therapy has no effect on. '22 18 14 10 Days pre-parcum 2 0 2 6 W 14 Days post-parcum Fig. 32.—Illustrating the drop in plasma carotene levels of cows at parturition. {From Sutton, T. S., Kaeser. H. £., and Soldner, P. A. (1945) J. Dairy Sci., 28, 933.) 240. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Goodwin, T. W. (Trevor Walworth). New York, Chemical Pub. Co.
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