Abstract

Breeding chickens for heat tolerance is desirable. The F18 and F19 generations of a broiler by Fayoumi advanced intercross line (AIL) was used to facilitate fine mapping of QTL. Three major phenotype collection phases were: pre-heat, acute heat, and chronic heat, with birds being exposed to daily heat cycles from 22 to 28 days of age. Body temperature was measured at all three phases; body weight at pre-heat and chronic heat phases. Breast muscle yield (as percentage of body weight) was measured after necropsy at d 28. Feed digestibility was assayed from ileal content collected at d 28. Birds were genotyped using a 600K Affymetrix chicken SNP array. Using GenSel significant QTL were found for each of the measured traits, indicating the feasibility of improving performance under hot conditions by genomic selection. This is the first GWAS using this novel AIL of chickens under heat stress.

Angelica G Bjorkquist

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Selection for harsh environments and management of animal genetic resources (Posters), , 427, 2014
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