Reproduction in mammals is controlled by the hypothalamo-pituitary-gonadal (HPG) axis under the influence of external and internal factors such as photoperiod, stress, nutrition, and social interactions. Sheep are seasonal breeders and stop mating when day length is increasing (anestrus). However, interactions with a sexually active ram during this period can override the steroid negative feedb...

June and July are usually months of graduation in Ethiopia. The 2005 EC (2013 GC) graduation season for those who successfully completed kindergarten, high school, college and university is well on the go. Congratulations to the achievers, their family and the teachers!!! Several college and university graduates in various fields of study will join the work force in different sectors soon. The ...

Common carp spawning characteristics were compared between season and out-of-season periods. There were no differences in the percentage of ovulation, spermatozoa motility and embryo survival to the eyed-egg-stage between the spawning periods. Fish spawned during the season produced oocytes of higher total weight than those spawned out-of-season. On the day exogenous feeding began, larvae obtai...