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Online Journal of Veterinary Researchฉ
Volume 25(1): 1-6, 2021.
Effect of Temperature humidity index on milk production and composition in Murrah buffaloes
Hitesh N. Pawar1*, G.V.P.P.S. Ravi Kumar2 and Raman Narang3
1,3Department of Animal Genetics and Breeding, GADVASU, Ludhiana- 141004, Punjab, 2Division of Animal Biotechnology, IVRI, Izatnagar, Bareilly-243122 (UP), India
Pawar HN, Kumar R, Narang R., Effect of Temperature humidity index on milk production and composition in Murrah buffaloes, Onl J Vet Res., 25(1): 1-6, 2021. Temperature humidity index (THI) is widely used to assess the effect of temperature and relative humidity on ruminant performance. Winter was characterized by mean maximum temperature of 23.07C and minimum of 9.19C with relative humidity of 96.4 and 51.4% whereas in summer these values were 33.03 and 25.19 oC and 89.61 and 68.19%, respectively. In summer, average THI was 81 and winter 60. Average THI exceeded the critical comfort level during test days (100%) in summer indicating that cows were heat stressed. During NH summer, THI values varied 89 and 70 from June to September. Daily milk yield decreased from 4.46 to 3.65kg (-18.2%) as THI increased from ≤ 74 to ≥ 83 in summer. Daily milk fat 8.3% declined (P < 0.05) in winter to 7.19% in summer. We found no significant effect (P≥0.05) on milk protein and SNF. Results confirm previous findings in cattle.
Key words: Temperature Humidity Index, Heat stress, Buffalo, Milk production.