Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Medicine and Health Sciences
Circulating Metabolic And Reproductive Hormone Changes In Laying Hens Kept Under Various Heat-Combating Systems, Muhammad Safdar Anjum, Mansur Abdullah Sandhu, Zia Ur-Rahman, Anum Safdar
Circulating Metabolic And Reproductive Hormone Changes In Laying Hens Kept Under Various Heat-Combating Systems, Muhammad Safdar Anjum, Mansur Abdullah Sandhu, Zia Ur-Rahman, Anum Safdar
Turkish Journal of Veterinary & Animal Sciences
The objective of the present study was to observe the circulating metabolic, reproductive, and stress hormones in laying hen performance under different heat-combating systems (HCSs). A total of 500 White Leghorn pullets at 24 weeks of age were subjected to four HCSs, i.e. desert cooling (DC), water sprinkling (WS), time limit feeding (TLF), and ascorbic acid (AA) supplementation, at environmental temperatures from 32.30 to 40.80 °C with 76.40% relative humidity. Blood was collected before heat stress, at peak stress, and after heat stress to collect plasma. The results of the 24-week stress period showed significantly less circulating T3, T4, estrogen, …
Comparative Efficacy Of Antioxidant Retinol, Melatonin, And Zinc During In Vitro Maturation Of Bovine Oocytes Under Induced Heat Stress, Jafrin Ara Ahmed, Devojyoti Dutta, Nawab Nashiruddullah
Comparative Efficacy Of Antioxidant Retinol, Melatonin, And Zinc During In Vitro Maturation Of Bovine Oocytes Under Induced Heat Stress, Jafrin Ara Ahmed, Devojyoti Dutta, Nawab Nashiruddullah
Turkish Journal of Veterinary & Animal Sciences
Both A and B grade cumulus-oocyte complexes (COCs) aspirated from cattle ovaries at slaughter were matured in vitro under normal (38.5 °C) and elevated temperatures (41 °C). Maturation competence based on cumulus expansion, COC diameter, and nuclear maturation were compared with and without antioxidant supplementation incorporating 7.5 µM retinol, 1 nM melatonin, and 1.5 µg/mL zinc chloride in an oocyte maturation medium. Heat stress significantly reduced cumulus expansion by approximately 20%, while only retinol could bring a significant (P ≤ 0.05) increase. Heat stress also decreased expansion of A (approximately 50%) and B (approximately 40%) grade COC diameter. All antioxidants …