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Carotene in the Ration of Dairy Cattle. I. The Influence of Long Periods of Suboptimal Carotene Intake on the Carotene and Vitamin A Values of the Blood, Liver, and Milk Fat of Dairy Cows^{1, 2,}

Departments of Dairy Husbandry, Agricultural Chemistry, and Veterinary Medicine, Oregon State College, Corvallis

ABSTRACT

Blood plasma, liver, and milk fat analyses for carotene and vitamin A in Jersey and Holstein cows on normal and suboptimal carotene rations were compared. Suboptimal carotene rations fed prenatally and over long periods of time after birth resulted in low liver vitamin A and carotene values, which failed to respond to carotene supplementation as high as 330 per kilogram of body weight. Repeated injections every 5 days of either 250,000 or 1,250,000 I.U. of vitamin A ester failed to result in any appreciable increase of liver vitamin A or carotene in cows on a suboptimal carotene ration.

¹ Approved for publication as Technical Paper No. 887 by the director of the Oregon Agricultural Experiment Station.

² Regional Cooperative Research W-2, Causes and Prevention of Breeding Failure, California, Colorado, Idaho, Washington and Dairy Research Branch USDA Cooperating.

³ Present address: Department of Dairy Science, University of Illinois, Urbana.

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				E. S. ERWIN, C. J. ELAM, and I. A. DYER Vitamin A-Carotene Deficiency Affects Serum Protein and Utilization of Carotene by Steers Science, October 11, 1957; 126(3276): 702 - 702. [PDF]