National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present investigation was undertaken to study the effect of elevated temperature and increased CO2 levels on biochemical and hormonal parameters of Tharparkar and Karan Fries heifers. The experiment was carried out in a climatic chamber. The animals of both breeds were exposed at different temperature and CO2 levels. Exposure conditions of 250C, 400 ppm CO2 level and 60% RH was taken as control condition. The exposure conditions 400C with two levels of CO2 500 ppm and 600 ppm with RH 55±5% and exposure conditions 420C with two levels of CO2 500 ppm and 600 ppm with RH 55±5% were taken as treatments. The exposure period in each condition was 4 hours daily for 5 consecutive days. The antioxidant enzymes (SOD, GPX and CAT) were higher and different at all the exposure conditions compared to control. The plasma cortisol and prolactin levels increased with increase in temperature and CO2 levels and were significantly higher during stressful conditions than control in both breeds. Thyroid hormones (T3 and T4) decreased significantly with elevated temperature and CO2 levels compared to control conditions. The parameters studied in the present investigations were significantly higher in Karan Fries than Tharparkar heifers. The study is an attempt to indicate the effect of predicted change in climate due to increased CO2 levels and environmental temperature (IPCC, 2007) on biochemical and hormonal functions in Tharparkar and Karan Fries heifers.
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