Cortisol and Postpartum Luteal Function in Cattle
الموضوعات :
A. Ezzat Ahmed
1
(Department of Animal Science, Faculty of Veterinary Medicine, South Valley University, 83523, Qena, Egypt)
M.N. Ismail
2
(Department of Animal Science, Faculty of Veterinary Medicine, South Valley University, 83523, Qena, Egypt)
M.S. Aref
3
(Department of Animal Science, Faculty of Veterinary Medicine, South Valley University, 83523, Qena, Egypt)
A. Zain El-Abedin
4
(Faculty of Veterinary Medicine, Sohag University, 82524, Sohag, Egypt)
A.Y. Kassab
5
(Faculty of Agriculture, Sohag University, 82524, Sohag, Egypt)
الکلمات المفتاحية: Cortisol, cattle, Cholesterol, luteal function, postpartum,
ملخص المقالة :
The present study investigated serum cortisol in response to postpartum ovarian resumption and luteal function. Postpartum ovarian resumption was detected based on a rise in progesterone (P4) concentrations during three weeks after calving. Twenty two Holstein cows in a semi-closed dairy farm in Qena city, Egypt were used. The study was carried out from late March to early June; the period characterized by a good temperature humidity index (THI) and absence of heat stress. According to the concentrations of P4 in serum (P4 >1.0 ng/mL), 11 of the 22 cows resumed the ovarian activity within three weeks after calving (ovarian resumption cows). No effect of THI was found during the postpartum period of study on the concentrations of P4, cortisol and cholesterol in the ovarian resumption or non-ovarian resumption group. In the former, cholesterol showed a significant correlation with both P4 (r=0.405, P<0.05) and cortisol (r=0.393, P<0.05). However, in the latter, cholesterol had a significant correlation with P4 (r=0.289, P<0.05) but showed no correlation with cortisol. In addition, cortisol showed a significant correlation with P4 (r=0.329, P<0.05) in the ovarian resumption group but showed no correlations in the non-resumption group. Our study suggests that cortisol plays a role in the function of corpus luteum and maintenance of luteal life span during this period.
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