Gengler, Nicolas ; Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Language :
English
Title :
Genotype x Climate interactions for protein yield using four European Holstein Populations
Publication date :
2014
Event name :
10th World Congress on Genetics Applied to Livestock Production
Event place :
Vancouver, Canada
Event date :
17-21 August 2014
Audience :
International
References of the abstract :
Reaction norm models were applied to investigate genetic variation in heat tolerance of Holsteins across environments using long term protein milk yield test-day records and weather variables as proxy of climate
change. Data represented four European regions characterized by different management systems and environments. Daily protein yield changed across the trajectory of temperature humidity index (THI) for all
studied populations, pointing out negative associations between warm conditions and cow performance. For most
regions, additive genetic variances for daily protein yield decrease when THI increases. Antagonistic relationships
between level and intercept were relatively limited for Slovenia compared to the three other regions. Rank
correlations of estimated breeding values for three proposed heat tolerance measures ranged from 0.56 (Spain and Slovenia) to 0.81 (Walloon Region of Belgium and Luxembourg), indicating a possibility of genotype by environment (G x E) for some pairs of regions.
