Bovine somatotropin hormone (BST). I. Milk yield responses from crossbred Sahiwal-Friesian dairy cattle

A. R. Azizan and R. H. Phipps

Abstract

Two experiments were conducted to evaluate the effect of prolonged release formulation of recombinant bovine somatotropin (BST) on milk production, milk composition, blood profile, body weight, BST and insulin-like growth factor-I (IGF-I) concentration in blood and milk samples of lactating crossbred Sahiwal Friesian (SF) dairy cows in Malaysia. The administration of BST increased milk yield of crossbred SF dairy cows by 1.3–2.1 kg/cow/day. While the administration of BST significantly increased serum BST and IGF-I concentration, milk BST and IGF-I, milk composition, body weight and general health of the cows were not affected. The studies confirmed the efficacy of BST in enhancing milk production of crossbred SF dairy cows in Malaysia.

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