Effects of exogenous porcine somatotropin administration between 30 and 60 kilograms on longissimus muscle fiber morphology and meat tenderness of pigs grown to 90 kilograms

摘要: Twenty-four barrows were used to investigate the effects of exogenous porcine somatotropin (pST) administration (0 and 100 micrograms.kg-1.d-1) between 30 60 kg on longissimus muscle morphology meat tenderness pigs grown 90 kg. Administration pST was by daily i.m. injection. Pigs fed a fortified diet in restricted amounts had ad libitum access this from Excipient fewer alpha R fibers more W than pST-treated (P less .05). increased .05) fiber area for all three types at both (34%) (29%) slaughter weights. Furthermore, shear-force (30% kg; 19% kg) muscle, indicating that reduced tenderness. All exhibited "giant syndrome" high proportion (62%) pale, soft, exudative muscle. Whether giant anomaly resulted protein accretion rate or degeneration is unknown. Results indicated stimulatory growth are sustained following cessation hormone treatment. However, incidence 62% indicates potentially has undesirable side effects.