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Effect of Vitamin D₃ on Milk Yield of Thyroparathyroidectomized Rats¹

Department of Dairy Husbandry, University of Missouri, Columbia

ABSTRACT

In a previous study it was shown that normal lactation could be maintained in thyroparathyroidectomized rats when 3 µg L-thyroxine/100 g body weight was administered in conjunction with Vitamin D₂ (calciferol) at a level of 0.2 mg/100 g b.w./day. In the present study it was shown that Vitamin D₃ at the same level (8,000 IU or 0.2 mg) per day was equally effective in maintaining normal milk yields on Days 14, 16, 18, and 20 in conjunction with L-thyroxine.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series no. 4029. Approved by the Director. This investigation was supported in part by a grant from the USPHS.