Extreme environmental conditions are a major challenge to livestock production worldwide and can cause detrimental effects to animal growth and reproduction. Furthermore, extremes of temperature or humidity are major contributors to oxidative cell damage and may also compromise the animal’s immune system. The aim of this study was to examine genomic differences among chicken ecotypes from two different climatic regions (Brazil and Sri Lanka = Tropical; Egypt = Arid) and identify regions that may be involved in the adaptation of chickens to these different environmental conditions. Comparisons were performed through Fst analyses. The analyses revealed a similarity between chickens from Sri Lanka and Brazil, including common regions of difference on chromosomes 2, 3 and 8 in the comparison with chickens from Egypt. The genes, TRMT1L and microRNA 6545 were detected on chromosome 8 and 2, respectively, in the Brazil vs Egypt comparison. These results provide insights into genes that could be under selection pressure in the three populations relative to their adaptation to arid versus tropical environments. Keywords: chickens, environment, selection pressure, adaptation

Max Rothschild, Muhammed Walugembe

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Challenges - Environmental, , 241, 2018
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