Genotype by Environment Interaction for Fertility, Survival, and Milk Production Traits in Australian Dairy Cattle
M Haile-Mariam, MJ Carrick, ME Goddard
JOURNAL OF DAIRY SCIENCE | AMER DAIRY SCIENCE ASSOC-ADSA | Published : 2008
The existence of a genotype x environment interaction (G x E) for fertility traits, survival, and milk yield traits was examined by considering performance recorded in different calving systems (seasonal, split, and year round) or regions as different traits. For fertility traits and survival, G x E were also investigated by applying a random regression model using continuous environmental variables, such as level of herd milk production, temperature-humidity index, and herd size as environmental descriptors. The traits considered were calving interval, calving to first service interval (CFS), 25-d nonreturn rate at first service, pregnancy rate, survival, milk yield, fat yield, and protein ..View full abstract
This research is funded by Dairy Australia and Victorian Department of Primary Industries ( Melbourne, Australia). We thank ADHIS for providing the data and Kevin Beard for data extraction.