Abstract
ABSTRACT The objective of this study was to explore the impact of thermal stress on hormonal level and antioxidant activity in goats during various phases of the estrous cycle in the Egyptian summer. Forty cycling does were allocated to two groups (20 animals each) divided by season (mild/hot). Daily meteorological, rectal temperature, and respiratory rate data were recorded in the two seasons. The estrous cycle of the goats was synchronized by two intramuscular injections of 5 mg of prostaglandin F2α [...]
Highlights
Oxidative stress is an imbalance between radicalgenerating and radical-scavenging activities resulting from increased production of pro-oxidants and/or a decrease in antioxidant defense (Bernabucci et al, 2002)
Reactive oxygen metabolites (ROM) are free radicals of an organism that constitute approximately 1-2% of the body and have essential functions such as protein phosphorylation, cell maturation, apoptosis, oocyte maturation, steroidogenesis, cell immunity, ovulation, implantation, blastocyst formation, luteolysis, acrosome reactions, fertilization, and luteal maintenance during pregnancy (Celi et al, 2012). Their levels increase at certain pathological conditions, which can cause damage of biological macromolecules and disrupt typical metabolism and physiology
All does were kept in semi-open pens throughout the experimental period and fed a basal diet with a concentrate feed mixture according to NRC (2007) requirements for goats
Summary
Oxidative stress is an imbalance between radicalgenerating and radical-scavenging activities resulting from increased production of pro-oxidants and/or a decrease in antioxidant defense (Bernabucci et al, 2002). Reactive oxygen metabolites (ROM) are free radicals of an organism that constitute approximately 1-2% of the body and have essential functions such as protein phosphorylation, cell maturation, apoptosis, oocyte maturation, steroidogenesis, cell immunity, ovulation, implantation, blastocyst formation, luteolysis, acrosome reactions, fertilization, and luteal maintenance during pregnancy (Celi et al, 2012). Their levels increase at certain pathological conditions, which can cause damage of biological macromolecules and disrupt typical metabolism and physiology (Trevisan et al, 2001). This climatic circumstance has a diminishing impact on both productive and reproductive efficiency of livestock (Jordan, 2003)
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