DOI: 10.37143/0371-4365-2020-74-04

A. G. Pasiutacandidate of technical sciences
ORCID:
E-mail:

L. P. Hryshina,Doctor of Agricultural Sciences
ORCID:https://orcid.org/0000-0001-6292-0257
E-mail:ludpavgri@ukr.net
Institute of Pig Breeding and agroindustrial production NAAS, Shvedska Mohyla Str., 1, Poltava, Ukraine, 36013
P. A. Vashchenko, Doctor of Agricultural Sciences
ORCID:https://orcid.org/0000-0002-9287-819X
E-mail:P.A.Vashchenko@gmail.com
Institute of Pig Breeding and agroindustrial production NAAS, Shvedska Mohyla Str., 1, Poltava, Ukraine, 36013

Abstract

The results of determining the validity and strength of the impact of paratypical (number and season of farrowing, year of birth) and genotypic (sow family) factors on the characteristics of sows’ reproductive qualities in the conditions of the breeding reproducer EE “DG im. 9 Sichnia”. As a result of determining the reliability of the influence of these factors by one-way ANOVA it has been found out that the year of birth and the ordinal number of farrowing significantly influence on the indicators of the number of piglets at birth, the number of piglets and the weight of the litter at weaning. At the same time, the average weight of one piglet during weaning was recorded by the significant influence of only genetic factors (sows family), and the influence of paratypical factors was not reliable, which indicates the possibility of effective selection by phenotype in improving this trait. The results of the analysis of variance also showed that under the conditions of EE “DG im. 9 Sichnia”no significant influence of the“ farrowing season ”factor was found on any of the studied traits of reproduced ability. The results obtained were used in the construction of linear BLUP models for the determination of breeding value on the grounds of reproductive qualities in the conditions of EE “DG im. 9 Sichnia ”. Maximum indexes of the characteristics of reproductive ability recorded in the 2-3rd farrows, starting from the 4th farrow, all indexes begin to decline, especially this is noticeable for the trait “weight of the litter”. In sows of 2017 year of birth, compared to 2015, there is a slightly smaller number of piglets and the weight of the litter at weaning (by 4.5-6.7%), while the average weight of one weaned pig increased by 0.2 kg. This fact is explained first of all by rejecting sows – among the sows that were born earlier (in 2015), as a result of the breeding work, less productive sows were rejected, and only those with high parameters remained. The linear models which have been developed with scientifically-based parameters will be used at the next stage of the work in determining the breeding value of pigs in the EE “DG im. 9 Sichnia “

Key words: breeding, reproductive qualities, factor, impact force, sows family, linear model.

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