VARIABILITY AND LEVEL OF CORRELATION OF REPRODUCTIVE TRAITS IN PIGS OF DIFFERENT BREEDING VALUE

Abstract

The paper presents the results of studies of reproductive traits of sows of large white breed of different breeding values, the indicators of variability of quantitative traits and the level of their correlations have been determined. The research was carried out in agricultural formations of the Dnipropetrovsk region and in the animal husbandry laboratory of the State Institution "Institute of Grain Crops of the NAАS of Ukraine". The assessment of sows of large white breed for reproductive traits has been carried out taking into account the following indicators: multiple pregnancy rate, animals; heavy litter, kg; milkiness, kg; number of piglets at weaning, animals; litter weight at weaning at the age of 28 days, kg, safety, %. The breeding value of animals has been determined by the breeding index of reproductive traits of sow (BIRTS), scores. It has been found that in terms of multiple pregnancy (11.1±0.14 animals) and litter weight at weaning in at the age of 28 days (74.4±0.85 kg) sows of the control stock corresponded to the I class and the Elite class. The maximum indicators of reproductive traits are shown by animals of the M⁺ class according to the breeding index of reproductive traits (BIRTS). The criterion for selection of highly productive animals according to this index is 97.85-123.99 scores. The variability coefficient (Cv, %) of reproductive traits of sows of different distribution classes according to the BIRTS index varies from 3.92 to 11.69%. The number of reliable paired correlation coefficients between the indicators of reproductive traits of sows and the breeding index of reproductive qualities (BIRTS) made 83.33%. The above indicates the efficiency of the BIRTS index used in selection and breeding work.