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The effect of bovine somatotropin (bST) on production of lactating Angora does with kids

J. J. Davis, T. Sahlu, R. Puchala, M. J. Herselman, J. M. Fernandez, J. P. McCann, and S. W. Coleman

Journal of Animal Science 77:17-24. 1999

The galactopoietic effects of bovine somatotropin (bST) in dairy cattle, sheep, and dairy goats are well established. The milk yield response to bST treatment in goats and sheep is more variable than that in cows. Bovine somatotropin also has been shown to positively affect growth, carcass composition, and wool fiber production. Variable results have been obtained for fiber production response to growth hormone (GH) treatment. Fiber growth was unchanged, decreased, or increased in sheep during GH treatment. In the recovery period after GH treatment, wool growth was reported to be similar to or greater than that in control sheep. To date no studies have been reported on the effect of bST on mohair or milk production in Angora does. In the present study, data were collected to determine whether bST treatment of lactating Angora does would affect preferentially the partitioning of nutrients towards fiber or milk production either during the period of bST treatment or in the period after bST treatment. However, results of this experiment do not depict potential to enhance mohair production through slow release bovine somatotropin treatment of Angora does. Growth by suckling kids may be enhanced, although cost effectiveness of the treatment is unknown.


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