O
O. Ravagnolo
Researcher at University of Georgia
Publications - 32
Citations - 1104
O. Ravagnolo is an academic researcher from University of Georgia. The author has contributed to research in topics: Residual feed intake & Biology. The author has an hindex of 8, co-authored 27 publications receiving 947 citations.
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Journal ArticleDOI
Genetic Component of Heat Stress in Dairy Cattle, Development of Heat Index Function.
TL;DR: Production data obtained from AIPL USDA included 119,337 first-parity, test-day records of 15,012 Holsteins from 134 Georgia farms collected in 1990 to 1997 and the temperature-humidity index calculated with the available weather information can be used to account for the effect of heat stress on production.
Journal ArticleDOI
Genetic Component of Heat Stress in Dairy Cattle, Parameter Estimation
O. Ravagnolo,Ignacy Misztal +1 more
TL;DR: The authors' data included 119,205 first-parity, test-day records from 15,002 Holsteins in 134 Georgia farms with temperature and humidity data from 21 weather stations throughout Georgia, finding joint selection for heat tolerance and production is possible.
Journal ArticleDOI
Effect of heat stress on nonreturn rate in Holsteins: fixed-model analyses.
O. Ravagnolo,Ignacy Misztal +1 more
TL;DR: Variation in NR45 caused by THI changes is sufficient to merit further studies to examine genetic components of heat tolerance for this trait, and it is observed that lower milk-producing animals showed 0.08 higher NR45 than higher- producing animals.
Journal ArticleDOI
Effect of heat stress on nonreturn rate in Holstein cows: genetic analyses.
O. Ravagnolo,Ignacy Misztal +1 more
TL;DR: The genetic component in heat tolerance for nonreturn rate in Holsteins was estimated using an animal linear model augmented by a random regression on a temperature-humidity index (THI) and a correlation between regular merit and heatolerance for NR90 was -0.04, indicating the need to separate selection.
Journal ArticleDOI
Studies on genetics of heat tolerance in dairy cattle with reduced weather information via cluster analysis.
O. Ravagnolo,Ignacy Misztal +1 more
TL;DR: The objective of this study was to explore the possibility of reducing the number of weather stations for studies on genetics of heat tolerance in dairy cattle, and the similarity of information from 21 Georgia weather stations was analyzed by cluster analysis.