Adaptive capability as indicated by endocrine and biochemical responses of Malpura ewes subjected to combined stresses (thermal and nutritional) in a semi-arid tropical environment |
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Authors: | Veerasamy Sejian Vijai P Maurya Sayeed M K Naqvi |
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Institution: | (1) Adaptation Physiology Laboratory, Division of Physiology & Biochemistry, Central Sheep and Wool Research Institute, Avikanagar, Tonk District, Rajasthan, 304501, India |
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Abstract: | A study was conducted to assess the effect of combined stresses (thermal and nutritional) on endocrine and biochemical responses
in Malpura ewes. Twenty eight adult Malpura ewes (average body weight 33.56 kg) were used in the present study. The ewes were
divided into four groups viz., GI (n = 7; control), GII (n = 7; thermal stress), GIII (n = 7; nutritional stress) and GIV (n = 7; combined stress). The animals were stall fed with a diet consisting of 60% roughage and 40% concentrate. GI and GII
ewes were provided with ad libitum feeding while GIII and GIV ewes were provided with restricted feed (30% intake of GI ewes)
to induce nutritional stress. GII and GIV ewes were kept in climatic chamber at 40°C and 55% RH for 6 h a day between 1000 hours
and 1600 hours to induce thermal stress. The study was conducted for a period of two estrus cycles. The parameters studied
were Hb, PCV, glucose, total protein, total cholesterol, ACP, ALP, cortisol, T4, T3, and insulin. Combined stress significantly (P < 0.05) affected all parameters studied. Furthermore, the results revealed that, compared to thermal stress, nutritional
stress had a less significant effect on the parameters studied. However, when both these stresses were coupled, they had a
severe impact on all the parameters studied in these ewes. It can be concluded from this study that two stressors occurring
simultaneously may impact severely on the biological functions necessary to maintain homeostasis in sheep. |
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