Title: 771. Genetic parameter estimates of heat tolerance in number of born alive in Landrace, Large White, and Duroc pigs
Abstract: This study aimed to investigate a suitable environmental indicator of heat stress on the number of born alive (NBA) and estimate the genetic variance components of a reproductive trait that reacts to heat stress. The data consisted of 26,770, 25,973, and 12,544 litters of Landrace, Large White, and Duroc sows, respectively, from four farms in Japan. The daily maximum ambient temperature was used as an indicator of heat stress. The correlation between the NBA and heat stress was estimated to determine a suitable period for heat load. The random regression model was fitted with heat load as random effects. Tolerance to heat stress was a heritable trait, but the variance was much smaller than trait performance in a standard environment. The heritability and additive genetic variance decreased as the heat load increased, implying that a lower heat load would be preferable for selection in NBA.
Publication Year: 2022
Publication Date: 2022-12-31
Language: en
Type: article
Indexed In: ['crossref']
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