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ABSTRACT
Male and female pigs—a cross-breed of Big white and Landrasa, were treated with 3 mg pig somatotropin (pST) daily for 56 days during the period of fattening (from 30 kg up to 100 kg body weight). The animals were given a fodder mixture (15% raw protein) with 0.6% and 0.8% lysine content. In the case of 0.6% lysine, pST caused a 3.3% increase of daily growth, at the same time it cut down the forage consumption by 246 g/kg growth and decreased the thickness of bacon with 4.1 mm. When the fodder contained 0.8% lysine, pST decreased the thickness of the bacon only. pST did not change the concentrarion of free fatty acids in the blood serum. It has been concluded that it is possible to increase the production of high-quality pork by applying a suitable combination of dose and scheme of pST treatment of pigs.