Genetic Component of Heat Stress in Dairy Cattle, Parameter Estimation
نویسندگان
چکیده
منابع مشابه
Genetic components of heat stress in finishing pigs: Parameter estimation.
The objective of this study was to describe genetic variability of pig carcass weight as a function of heat stress. Data included carcass weights of 23,556 crossbred pigs [Duroc x (Landrace x Large White)] raised on 2 farms in North Carolina and harvested from May 2005 through December 2006. Weather data were obtained from a weather station located about 20 km from the furthest farm. Weekly hea...
متن کاملEffects of heat-stress on production in dairy cattle.
The southeastern United States is characterized as humid subtropical and is subject to extended periods of high ambient temperature and relative humidity. Because the primary nonevaporative means of cooling for the cow (radiation, conduction, convection) become less effective with rising ambient temperature, the cow becomes increasingly reliant upon evaporative cooling in the form of sweating a...
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A well-known dairy scientist once wrote that "compared with an effective environmental management system, manipulation of the cow's diet specifically for heat stress will have a relatively small effect on productivity" (Beede and Shearer, 1992). Indeed many dietary adjustments made during heat stress feeding are to compensate for reduced feed intake or to maintain physiologic homeostasis in the...
متن کاملThermal Stress in Dairy Cattle
Crosses of temperate cattle reared in tropical ambience lapse in heat tolerance, fertility and disease resistance. However, cross breeding zebu with high yielding exotic cattle seems necessary to meet the need for enhanced composite milk production per unit in view of food security. Thermal stress is considered as the main factor responsible for reduction of milk yield in tropical climate. Any ...
متن کاملEstimation of genetic parameters for production traits and somatic cell score in Iranian Holstein dairy cattle using random regression model
In this study test-day records of milk (kg), fat (g), and protein (g) yields, somatic cell score (SCS, cells/ML) collected by Animal Breeding Center of Iran during 2007 and 2009 were used to estimate genetic parameters using random regression model. Models with different order of Legendre polynomials were compared using Bayesian information criterion (BIC).For milk, fat yield and SCS genetic an...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2000
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(00)75095-8