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Plasticity and stability of prolificacy in Landrace and Welsh sows under different feed ing and housing conditions

This article presents the results of a study on the adaptive capacity of Landrace and Welsh sows to variable feeding and housing conditions in an unstable production environment. The aim of the study was to assess the plasticity and stability of sow prolificacy using regression analysis based on the Eberhart-Russell method. Prolificacy of sows over six generations was used as an environmental index. The study used data on the reproductive capacity of 822 sows, which, during their breeding period, were subject to fluctuations in feeding, housing conditions, microclimate, and level of care. The analysis revealed that Landrace sows are characterized by higher plasticity (bᵢ = 1.464) and lower residual variance (S²dᵢ = 1.926) compared to the Welsh breed. And therefore they have lower variability and greater stability of prolificacy. The regression model for the Landrace breed was statistically significant (p = 0.004), confirming its reliability and predictive value in assessing adaptive traits. In contrast, Welsh sows showed a lower plasticity coefficient (bᵢ = 0.605), higher residual variance (S²dᵢ = 2.227), and a statistically insignificant regression model (p > 0.05), which complicates the practical application of this model for prediction. The results are consistent with previous findings on the genetic determination of adaptive responses in pigs of different breeds. The Landrace breed showed a better balance between reactivity to environmental changes and stability of reproductive function, which makes it promising for use in unstable or stressful conditions. The obtained data can be used in breeding work to produce adapted breeding stock with increased prolificacy under unpredictable changes in feeding and housing conditions.

Keywords: sows, prolificacy, stability, plasticity, feeding, housing, Landrace breed, Welsh breed.

SHABLIA P. https://orcid.org/0009-0006-1248-9925


SHABLIA V. https://orcid.org/0000-0001-6510-5397


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BTF №2 2025