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Extension model of lactation curves to evaluate the effect of the recombinant bovine somatotropin on milk yield in Holstein cows Arq. Bras. Med. Vet. Zootec.
Palacios-Espinosa,A.; Espinoza-Villavicencio,J.L.; de Luna,R.; Guillén,A.; Avila,N.Y..
An extension model of lactation curves was used to determine the effect of recombinant bovine somatotropin (bST-r) on milk yield in Holstein dairy cattle. This model use the fitted values obtained by the Wood model, and was tested on the records of 66 cows. The milk yield predicted with the extension model and the observed yield were compared and no significant differences were observed (P>0.05). Once the extension model was validated, the milk yield tests of 199 cows were used. The cows received bST-r 500mg by subcutaneous injections. The injections were applied after 100 days in milk at 14-day intervals (seven injections). The observed milk yield was compared with the yield expected by the extension model. An increase of 5.3% was observed in milk...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dairy cattle; BST-r; Mathematical model.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000100017
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