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The Placental Transfer and Colostral Storage of Vitamin D in the Bovine¹

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

The effects of supplementing the dry cow ration with 100,000 I.U. of vitamin D in the form of irradiated yeast once daily for 8 weeks prepartum at two different seasons of the year have been studied. The following results were obtained:

1. An increase in the vitamin D content of the blood plasma was observed in those cows receiving the vitamin D supplement as compared to those levels obtained in the non-supplemented cows.
   
2. No consisteint differences were found in the vitamin D content of blood plasma and liver of newborn calves from supplemented dams as compared to newborn calves from control dams.
   
3. The colostral storage of vitamin D was materially increased by pre-partal supplementation of vitamin D.
   
4. There was a seasonal trend in vitamin D content of maternal blood plasma, blood plasma and liver Of the newborn calf, and colostrum. The values obtained during the latter part of the pasture season were materially higher than those values obtained at the latter part of the spring feeding period.
   

¹ This paper is part of a thesis presented by H. D. Eaton to the Graduate School of Cornell University in partial fulfillment of the requirements for the degree of Doctor of Philosophy.