Heat tolerance of crossbred female calves as indicated by Iberia heat tolerance coefficient, Benezara coefficient of adaptability and dairy search index
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Authors
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J. Nikhil Kumar Tej
Ph.D. Scholar., Animal Physiology Division, National Dairy Research Institute (NDRI), Karnal
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K. Uday
Ph.D Scholar, Division of Animal Genetics and Breeding, National Dairy Research Institute (NDRI), Karnal
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G. GirishVarma
Department of Veterinary Physiology, College of Veterinary and Animal Sciences, Mannuthy, Thrissur, Kerala
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K. Karthiayini
Department of Veterinary Physiology, College of Veterinary and Animal Sciences, Mannuthy, Thrissur, Kerala
Keywords:
Heat tolerance, season, adaptability, crossbred calvesAbstract
A study was conducted to assess the heat tolerance of crossbred female (n=7) calves of six to twelve months of age for thirty days each in summer, monsoon and winter. Temperature humidity index (THI) was calculated at forenoon and afternoon in all the seasons and heat tolerance was carried out using Iberia heat tolerance coefficient, Benezara coefficient of adaptability and Dairy search index. The highest THI was recorded in summer afternoon while lowest was recorded in winter forenoon. There was a significant increase in THI from forenoon to afternoon in all the seasons. IHTC was within the reference value in winter forenoon while rest of the time it was below the normal. IHTC decreased significantly from forenoon to afternoon in all the seasons. BCA was above the reference value in forenoon and afternoon in all the seasons. BCA increased significantly from forenoon to afternoon in all the seasons. DSI was significantly lower in winter compared to summer. It was concluded that crossbred female calves have low heat tolerance during afternoon in all the seasons.
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