Effect of different selection criteria on growth traits and carcass quality in pigs

Abstract

Research has included four breeds (Landrace and Yorkshire as fertile) and (Pietrain and Duroc as a terminal) pigs. Selection criteria are significantly different due to the negative genetic correlation between milk yield and meatiness and positive heads between capacity and production capabilities. The test involved 558 animals of both sexes who are descended from the 43 father and 282 mothers. Carcass quality tests were performed on 144 animals, also of both sexes. The average weight of animals at the end of the fattening period was 103 kg and a standard deviation of 2.6 kg. Bones density did not differ significantly between Landrace, Yorkshire and Duroc. Pietrain bones were significantly easier. This demonstrates the viability of lower growth in this race compared to the other and longer feeding for 24 to 32 days. When it comes to the only growth was significantly lower in Pietrain animals were compared to their peers of other races. The content of meat in the carcass was approximately 57.6% in fertile breeds and Duroc 58.9%. It was not significantly different. Pietrain had 62.1% of meat in the carcass which is significantly higher than in other races. Intramuscular fat content was: 0.8% of Pietrain, Duroc 2.6% 2.0% Landrace and Yorkshire 1.8%. The level of protein as the most important parameter of meat quality was the lowest in Pietrain (20.1%), Landrace and Yorkshire were 21.8% and 22.5% and 22.9% Duroc. Selection criteria relate to the last eight generations of selection and the effects show the expected trends.