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Seasonal Variation in the Fat, Vitamin A, and Vitamin D Content of Sows Colostrum and Milk¹

University of Wisconsin^,4

Abstract

Pregestation intake of vitamin A percursors influences the A content in sow's milk. The vitamin A and D values in the milk of sows farrowing in February as compared with sows farrowing in April suggest a gradual depletion in the body stores of these two vitamins. Condition of a sow at the time of parturition influences the concentration of fat in the sow's colostrum.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison.

² Present address—Department of Animal Science, University of Alberta, Edmonton.

³ The authors wish to acknowledge the assistance of Dr. H. T. Scott, Director of Biological Research, Wisconsin Alumni Research Foundation, for conducting the vitamin D assays.

⁴ Departments of Animal Husbandry and Biochemistry, Madison, Wisconsin.