Evaluation of thermal stress indexes for dairy cows in tropical regions
نویسندگان
چکیده
منابع مشابه
Evaluation of heat stress response in crossbred dairy cows under tropical climate by analysis of heart rate variability
The present study aims to examine the effect of tropical temperatures on autonomic nervous activity in Cambodian dairy cattle by analyzing heart rate variability (HRV). Holter-type electrocardiograms were recorded in adult crossbred cows (Cambodian native × Holstein) either in a sheltered area or under direct sunlight. Rectal temperatures and heart rates increased in animals under direct sunlig...
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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 ...
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This paper intended to review the lameness in dairy cattle. But it was necessary to have an overview about the hoof anatomical structure, it's growth and overgrowth properties. Most common causes of lameness such as laminitis and its different clinical form or presentation such as sole ulcers, toe ulcers, white line disorders, sole and white linehemorrhages have been reviewed and discussed. ...
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ژورنال
عنوان ژورنال: Revista Brasileira de Zootecnia
سال: 2007
ISSN: 1516-3598
DOI: 10.1590/s1516-35982007000500028