Abstract
1. Genetic analyses of protein yield in dairy cows applying random regression models with time-dependent and temperature x humidity-dependent covariates K. Brügemann, E. Gernand, U.U. von Borstel, S. König Journal of Dairy Science CrossRef
Highlights
It is apparent that the performance, well-being, and health of an animal are influenced by biometeorological factors
The objective of this paper was to evaluate the effect of high temperatures on milk production by dairy cows
The summer of 2003 was extremely hot in East Central Europe and high temperatures already manifested from May and persisted to the end of September
Summary
It is apparent that the performance, well-being, and health of an animal are influenced by biometeorological factors. The most important climatological factors are heat stress during the hot season and the wind-chill factor during the cold season of the year. Critical temperatures will vary depending on several factors including degree of acclimatization, rate of production, pregnancy status, body weight, exposed body surface, hair coat, air velocity, relative humidity, sweating, radiant heat and temperature (Aharoni et al, 2005; Berman, 2005). Life stage, conditioning, and nutritional and health status influence the level of vulnerability to environmental stressors (Hahn, 1999). Genetic diversity within a population can influence the level of response and the degree of adaptability, so that what is stressful for some may not be stressful for others
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