Bovine Somatotropin Hormone (BST). II. Effects of dosage rate and calcium-soap supplementation on milk yield responses of crossbred Sahiwal-Friesian dairy cattle

A. R. Azizan and R. H. Phipps

Abstract

The effects of feeding calcium-soap and administration of bovine somatotropin (BST) at various dosage rates on the milk yield of crossbred Sahiwal-Friesian cows were evaluated in two separate experiments. In the first experiment, a 500 g/day supplement of calcium-soap increased milk yield of crossbred Sahiwal- Friesian cows by 1.4 kg/day. However, the milk yield response obtained from BST treatment was only marginally increased when the plane of nutrition was improved by the inclusion of calcium-soap. In the second experiment, the milk yield response of crossbred Sahiwal-Friesian cows was shown to be dependent on the BST dose rate and the optimum dose was 250 mg of BST at 14 day intervals.

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