This manuscript presents the results of a review of the effects of recombinant bovine somatotropin (rBST) on milk production, milk composition, dry matter intake, and body condition score that was carried out by an expert panel established by the Canadian Veterinary Medical Association (CVMA). The panel was established by the CVMA in response to a request from Health Canada in 1998 and their re...

The aim of the study was to produce sensitive and specifi c polyclonal antibodies against somatotropin (ST) to be used for standardization of an ELISA to measure growth hormone (GH) level in serum and milk of lactating buffaloes. Recombinant bovine somatotropin (rbST), kindly donated by NHPP, California, USA was injected both in chicken and rabbit emulsifi ed with Freund’s complete adjuvant fol...

The administration of recombinant methionyl bovine somatotropin (rMbST) to dairy cows to increase milk yield remains a common practice in many countries including the USA, Brazil, Mexico, South Africa and Korea, whereas it has been forbidden within the European Union (EU) since 1999. A rapid screening immunoanalytical method capable of the unequivocal determination of rMbST in milk would be hig...

Eight multiparus lactating goats, matched for parity and days in milk were used to evaluate the effects of recombinant bovine somatotropin (rbST) administration on milk yield and composition, as well as on certain metabolic parameters. The experiment was a switch-back design, with three periods lasting 28 days each. Animals were divided into two groups (n ˆ 4) and treatments consisted of subcut...

The objectives of this study were to determine the efficacy of various doses of rbST on ADG and feed efficiency (FE) and to describe carcass composition changes in finishing beef steers. In Exp. 1, 96 crossbred beef steers (393 kg) received daily i.m. injections of buffer or 33, 100, or 300 micrograms/kg of BW of rbST (0ST, 33ST, 100ST, 300ST). In Exp. 2, 200 crossbred beef steers (417 kg) rece...

This study aimed at determining the association between reproductive indexes and total milk yield in non-planed lactations ≥600 days sub-fertile Holstein cows treated or not with recombinant bovine somatotropin (rbST) experienced prolonged hyperthermia. A of 1141 a single lactation were enrolled study: 622 rbST (control) 519 (500 mg every 14 throughout lactation). Across parities, control >4...