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Cyclooxygenase and prostaglandins in somatic cell populations of the testis
(Bioscientifica, 2015-04)
rostaglandins (PGs) are synthesized through the action of the rate-limiting enzyme cyclooxygenase (COX) and further specific enzymes. The development of Cox-deficient mice in the 1990s gave insights into the reproductive ...
Alternative mating tactics in dimorphic males of the harvestman Longiperna concolor (Arachnida: Opiliones)
(SPRINGER, 2011)
Intense male-male competition for females may drive the evolution of male morphological dimorphism, which is frequently associated with alternative mating tactics. Using modern techniques for the detection of discontinuous ...
Prenatal testosterone supplementation alters puberty onset, aggressive behavior, and partner preference in adult male rats
(Springer Tokyo, 2012-03-01)
The objective of this study was to investigate whether prenatal exposure to testosterone (T) could change the body weight (BW), anogenital distance (AGD), anogenital distance index (AGDI), puberty onset, social behavior, ...
Maternal age influences on reproductive rates in Nile tilapia (Oreochromis niloticus)
(Revista Brasileira Zootecnia Brazilian Journal Animal Sci, 2015-04-01)
In this study we examined the effects of the maternal age on the fecundity (absolute and relative), egg production, and fertilization rates of Nile tilapia (Oreochromis niloticus). Females were divided into three groups: ...
Effect of capacitation of stallion sperm with polyvinylalcohol or bovine serum albumin on penetration of bovine zona-free or partially zona-removed equine oocytes
(2003-08-01)
Experiments were conducted to study effects of macromolecules on stallion sperm capacitation and fertilization as determined by penetration of bovine zona-free and equine partially zona-removed oocytes. Stallion sperm were ...
Fenvalerate, A Pyrethroid Insecticide, Adversely Affects Sperm Production and Storage in Male Rats
(Taylor & Francis Inc, 2008-01-01)
The aim of this study was to investigate the potential estrogenic activity of fenvalerate by examining reproductive and fertility capabilities in Wistar rats. Adult male animals were treated for 30 d with 20 or 40 mg/kg/d ...