Genetic variability for heat stress sensitivity in Merino de Grazalema sheep
2014; Elsevier BV; Volume: 121; Issue: 2-3 Linguagem: Inglês
10.1016/j.smallrumres.2014.06.007
ISSN1879-0941
AutoresA. Menéndez‐Buxadera, J. M. Serradilla, A. Molina,
Tópico(s)Heat Transfer Mechanisms
ResumoAbstract Different fixed linear models and reaction norm genetic models were used to estimate heat stress effects, which were measured by a combined index of average temperature and relative humidity known as THI, registered on the same test day (TD). A total of 17,602 TD with the results of daily milk yield (MY), daily fat plus protein yield (FP) and daily dry matter yield (DM) were available. These data are from 2622 Merino Grazalema sheep: daughters of 77 bucks and 870 ewes kidding between 2006 and 2011 in a total of 27 dairy units in Andalusia, Spain. During the period of the study, the productive characteristic increased slightly, whereas the climatic variables and the THI index increased substantially. The analyses shows the presence of a comfort zone (THI
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