INCREASING MEAT CONTENT OF FATTENING PIG CARCASS BY MEANS OF CROSSING WITH THE PIETRAIN BREED, LOWERING SLAUGHTER BODY WEIGHT, AND STANDARD FEEDING

摘要

The carcass meat content depended on the carcass weight (bxy = -0.487~(xx), r = -0.350~(xx)). A single crossing with Pietrain boars caused an increase in the meat content, compared with Polish LW purebreds, by about 2% (49.0 and 47 0% respectively).However, the lightest group of purebred fattening pigs (80-93 kg of live body weight) had almost the same meat content of carcass as crossbreds (495 and 49.6%). Standard feeding of breeding gilts indicates that this a method results affected a lower backfat thickness, in comparison with ad libitum feeding (18.2 and 214 mm respectively - P<0,01) Taking into consideration the relations between meat content and fat thickness (bxy = -0.800~(xx), r = -0.929~(xx)) the gilts fed by standard method had about 3%more meat content of carcass than those fed ad libitum.