RESULTS OF REPRODUCTIVE TRAITS IN TESTED HYBRID COMBINATION (CLW X CL) X D AND AN INFLUENCE OF USED BOARS ON REPRODUCTION

The aim of the study was to evaluate the results of reproductive traits of tested hybrid combination (CLW x CL) x D and an influence of Duroc boars which were used in test. These traits of reproduction were studied: number of all born piglets, number of live born piglets and number of weaned piglets. Losses from live born piglets till weaning were checked too. Birth weight and weaning weight were monitored for complementation. In a file of 56 sows there was found an average number of all born piglets 13.86, number of live born piglets 12.61 and number of weaned piglets 11.13. Sows which were inseminated by sperm of boar HAI 35 they had the highest number of live born piglets in average (13.63). HAI 34 was the boar with the worst results – 11.9 live born piglets per sow in average. Numbers of weaned piglets are well-balanced in boars DUR 363 and HAI 35, sows had more than 11.6 of weaned piglets per litter in average after both of them. After boar HAI 34 was the lowest number of weaned piglets – 10.3. There was not found statistically conclusive difference among boars during statistical analysis of number of all born, live born and weaned piglets. An average birth weight of tested piglets was 1.47 kg. A statistical conclusive difference on a level of importance P≤0.01 was found between sexes. A higher birth weight 1.51 kg was determined in boars in comparison with gilts – 1.42 kg. The lowest birth weight had offspring after boar DUR 363- 1.37 and offspring after boar HAI 35 (1.39). Among offspring of the other boars the birth weight was around 1.5 kg in average. A statistically conclusive difference was found during test of conclusiveness of birth weight in each boar