Use of bovine somatotropin for milk production: the effect of time of treatment initiation on milk production of Holstein/Friesian dairy cows placed on a high-forage, low-concentrate feeding system - PHIPPS, R. H.; ADRIAENS, F.; HARD, D. L.; KERCHOVE, G.; WELLER, R. F. (Blackwell Publishing Ltd, 1996)
http://dx.doi.org/10.1111/j.1365-2494.1996.tb02044.x
Keywords: ZA-ZE