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A Study of the Supplemental Feeding of Carotene for Range Breeding Cows during the Precalving and Calving Period¹

New Mexico Agricultural Experiment Station

Abstract

Two groups of grade Hereford cows were grazed on dormant range typical of southern New Mexico and given supplemental feed during the pre-calving and calving periods. The energy and the digestible protein of the supplemental feed were approximately the same for both groups, but one group received additional carotene from dehydrated alfalfa meal.

The blood carotene of the cows fed cottonseed meal was well above the requirements as shown by various workers, indicating no major deficiency over an eight-year period even in the most critical season.

An important observation of this project is that the feeding of the mixture, containing 23 percent dehydrated alfalfa meal, did not raise the plasma carotene over that of the cows fed no extra carotene. There was no significant difference in the plasma carotene and vitamin A results for the two groups.

¹ Journal Series No. 87, Agricultural Experiment Station, New Mexico College of Agriculture and Mechanic Arts, State College, N. M.

² Nutrition chemist and animal husbandman, respectively, Agricultural Experiment Station. New Mexico College of Agriculture and Mechanic Arts, State College, N. M.