The present invention is directed to antibodies, in particular monoclonal antibodies, of porcine somatotropin (pST). When these antibodies are administered together with pST, the growth of vertebrates is greater than that achieved with the administration of pST alone. The invention is also directed to an increase in the growth of vertebrates which persists over long periods when an antibody to a somatotropin is administered together with such somatotropin.
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