Physiological parameters for thermal stress in dairy cattle
نویسندگان
چکیده
منابع مشابه
Thermal 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 کاملPhysiological and cellular adaptations of zebu cattle to thermal stress.
During their separate evolution from Bos taurus, zebu cattle (Bos indicus) have acquired genes that confer thermotolerance at the physiological and cellular levels. Cattle from zebu breeds are better able to regulate body temperature in response to heat stress than are cattle from a variety of B. taurus breeds of European origin. Moreover, exposure to elevated temperature has less deleterious e...
متن کاملParameters for the determination and evaluation of heat stress in dairy cattle in South Africa.
Not all parameters are trustworthy and practical to use as parameters to determine heat stress in dairy cattle. The temperature-humidity index (THI) is still the best, simplest and most practical index (parameter) for measurement of environmental warmth which cause heat stress in dairy cattle. It is practical, easy to determine and relatively trustworthy to use body temperature and respiratory ...
متن کاملSituations Leading to Oxidative Stress in Dairy Cattle
Free radicals are normally produced by living organism, at controlled production rate they perform physiological functions as signal transduction molecules. However, situations leading to an overproduction that surpasses antioxidant capacity creates oxidative stress. Consequently, damage to the cell membrane, protein, DNA and cell death are observed. Dairy cattle are susceptible to oxidative st...
متن کاملPhysiological Mechanisms Leading to Reproductive Decline in Dairy Cattle
Dairy cattle are inseminated and pregnancy is established during lactation. Therefore, lactation and the reestablishment of pregnancy must overlap. Unfortunately, recent changes in the genetics, productivity, and management of dairy cows have led to a decline in reproductive efficiency. Reproductive decline in dairy cows began in the mid-1980’s and may be continuing on modern dairy farms (Lucy,...
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ژورنال
عنوان ژورنال: Revista Brasileira de Zootecnia
سال: 2016
ISSN: 1516-3598
DOI: 10.1590/s1806-92902016000800006