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Parturient Paresis. VIII. Results of Parathyroidectomy of Cows^{1, 2,}

Department of Dairy Husbandry, University of Wisconsin, Madison

ABSTRACT

Nonlactating pregnant cows and nonpregnant lactating dairy cows were thyroparathyroidectomized. Blood serum calcium and plasma inorganic phosphorus analyses were made at various intervals before and after thyroparathyroidectomy. A marked decrease in serum calcium and less of a decrease in inorganic phosphorus occurred after removal of the parathyroid glands. None of the cows exhibited symptoms of milk fever, although the serum calcium of several of the cows decreased to the range where milk fever symptoms occur. The natural diet of ruminants has a high Ca:P ratio and, on this diet, the adult ruminant cow can maintain pregnancy, parturiate, and lactate in the absence of parathyroids.

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

² This study was supported in part by a grant of funds from Babson Brothers Co., Chicago, Illinois.