Study on delineation of period of heat stress in buffaloes

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Date
2020-01-20
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu (J&K)
Abstract
The present study was carried out to delineate the period of heat stress in buffaloes. The study was carried out in buffaloes for a period of one year (August 2018 to July 2019) by assessing physiological, thermogenic, haemato-biochemical and gene expressions profile of buffaloes at different temperature humidity index (THI). The range of THI indicating degree of heat stress in buffaloes were different than that of cattle. The rectal temperature (RR) and pulse rate (PR) as well as skin temperature of head region showed a significant increase at THI 68-69. In the THI range 68 to 72 no major deviation was observed. Significant (p<0.05) increase in these parameters was again observed at THI 73 and THI 77. Haematalogical parameter viz., hemoglobin (Hb %), PCV and biochemical parameters followed a similar pattern of changes in above mentioned THI ranges. Expression studies of heat shock responsive genes (HSR) showed that both heat shock protein 70 (HSP70) gene family viz., HSPA2, HSPA1A, HSPA1L, HSPA8 and heat shock transcription factor (HSF) genes viz., HSF1, HSF2 were expressed in buffaloes in response to incremental THI. The study concludes that early sign of heat stress occurred at THI 68-69. A THI range of 68-72 causes mild heat stress, THI 73-77 causes moderate stress and THI>77 causes severe heat stress in buffaloes The study also reports skin temperature as a potential indicator of monitoring heat stress in dairy buffaloes.
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Study on delineation of period of heat stress in buffaloes
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Citation
Jeelani et al., 2019.
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