EVALUATION OF REPRODUCTIVE TRAITS OF SOWS OF BELARUSIAN LARGE WHITE BREED BASED ON INTEGRATED SYSTEM OF SELECTION-AND-GENETIC METHODS

Abstract

Analysis of the results of evaluation of performance of sows of Belarusian large white breed according to reproductive traits showed that the highest safety of piglets was shown by the sows of the lines and related groups of Drachun 562 (93.5 %), Skarb 5007 (95.2 %) and Svitanak 3884 (95.3 %). The reproduction traits indices (RTI) were recorded in sows of lines Svat 3487 (126.0 points), Skarb 799 (127.0) and Secret 8549 (127.2 points). The polymorphism of ESR gene in sows of the Belarusian large white breed has been studied depending on their linear affiliation. It was determined that animals of the same lines and related groups may have different polymorphism of ESR gene, sometimes even all genotypes - AA, AB, BB (Svitanak 3884, Smyk 46706) may present. It can be noted that within the lines, multiparty of sows with preferred genotypes AB and BB tends to increase by 0.9-22.6% in comparison with AA genotypes. The reproductive traits of sows are estimated based on integrated system of selection and genetic methods and techniques. It was determined that boars of the lines and related groups carrying predominantly undesirable AA genotype in their genome, had index of reproductive qualities lower by 3.2-9.8% compared to their coevals with genotypes AB and BB. At the same time, in groups of animals with mostly desired genotypes AB and BB of the ESR gene in their genome, the RTI indices were significantly higher and made 120.0-128.3 points.