Bull Fertility and Its Relation with Density Gradient Selected Sperm.

Background: Sperm selection method is usually used to collect these cells for -assisted reproduction. Few studies reported the relationship of fertility and semen parameters after sperm selection; hence, the present study attempted to assess different semen parameters after post-thaw or sperm selection, using density gradient separation BoviPure®, to predict fertility.

Materials And Methods: In this experimental study, frozen semen quality of four Montbeliarde bulls were assessed after post-thaw (PT) or after sperm selection (SSp), using density gradient separation BoviPure®, to predict the fertility rate in vivo.

Chronic effects of low lead levels on sperm quality, gonadotropins and testosterone in albino rats.

The current study evaluates the impact of low or moderate levels of lead acetate (PbAc) on sperm parameters, gonadotropins (FSH, LH) and testosterone. Adult albino wistar male rats were allocated to five groups and given 0%, 0.025%, 0.