Seasonal changes may cause vitamin A deficiency in range heifers
AuthorsJames G. Morris
Teresa I. Iglesias
Authors AffiliationsJames Morris is Professor, Department of Animal Science and Physiological Sciences, University of California, Davis; Teresa Iglesias was former graduate student and post-doctoral fellow, respectively, in the Department of Animal Science and Physiological Sciences, University of California, Davis; Myung-Hee Kang was former graduate student and post-doctoral fellow, respectively, in the Departments of Animal Science and Physiological Sciences, University of California, Davis.
Hilgardia 43(3):30-31. DOI:10.3733/ca.v043n03p30. May 1989.
Range cattle obtain vitamin A from carotenoids in green plants. In northern California's foothill ranges, carotenoids are destroyed as forage dries in the summer. Tests of liver and blood plasma in grazing cattle indicated that mature breeding cows can store enough vitamin A during the green season to meet later needs. Heifers on their first calf, however, may need vitamin A supplementation.
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