THE IMPACT THERMAL STRESS ON SOME PHYSIOLOGICAL, ENDOCRINE PROFILES AND HSP IN LOCAL MALE CALVES
2020
Jinan A. Hilal | Muna H. AL-Saeed
This study was conducted in the field cattle in Al-Qurna, north of BasraGovernorate, in the period between July 2018 to February 2019 and included thefollowing seasons, the monthly summer season(July and August of 2018), themonthly autumn season (October and November of 2018) and the winter season ismonthly (January and February of 2019) .This experiment was designed to reveal theeffect of the THI value on some physiological and hormonal values on the local maleHolstein. The studied group include 20 calves and with age between (one year to oneyear and eight months), twenty blood samples were collected per month from maleHolstein calves subjected to a different value of temperature and humidity in differentmonths and seasons.The results of the first experiment showed: A significant(P≤0.05)increase in the values of THI, respiratory rate, and heart rate, where asignificant(P≤0.05) increase was noted in months and the summer season except forthe rectal temperature, which showed no significant difference (P˃0.05) amongdifferent seasons. The antioxidants CAT, MDA, SOD, and GPX also showed asignificant increase (P≤0.05) during the summer months and seasons compared to theautumn and winter months and seasons. Also significant increase (P≤0.05) in cortisoland HSP70 during the summer and season months.The levels of testosterone andthyroid hormone (T4) and triiodothyronine (T3) decreased significantly (P≤0.05)during summer and season compared to other months and seasons, but the level ofinsulin in the blood showed a significant decrease (P≤0.05) during the summer seasonthan the other seasons.
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