The analysis of reproductive performance of sows in the selected breeding

The aim of this diploma thesis was to assess the performance achieved at sows of CLW breed and hybrid sows of CLW x CL within 1 year in a selected breeding. As a result of the appearance of heterosis effect, 0.34 of live born piglets more was born at the cross breeds of F1 generation CLW x CL than to the sows of the CLW breeds. The sows with the length of pregnancy up to 114 days (11.34 piglets) delivered by 0.62 live-born piglets more than sows with the length of pregnancy over 115 days (10.72 piglets). The sows with farrowing interval up to 162 days had a higher number of live-born piglets (11.54) than the sows with farrowing interval over 163 days (11.39). The mating of the sows the fifth day after the piglet weaning, had a positive effect on the number of live-born piglets. The effect of age at first mating on the number of live-born piglets was positively reflected in the interval age 256?270 days (10.53 pieces) and 210?225 days (10.47 pieces). The highest number of live-born piglets was demonstrated from 3rd to 5th parity. The most sows of both genotypes were selected because of returning to service. The analysis of an age structure of the herd was performed as well