Effect of GnRH and hCG injection on the reproductive performance and serum progesterone concentration of ewes during spring season.

This study was carried out to investigate the effect of different hormonal programs on the reproductive parameters and serum progesterone concentration of Lake-Ghashghaei ewes in spring season. In this study, 144 ewes were selected from two large nomadic herds. The ewes were synchronized using progesterone sponges.

Sperm DNA fragmentation induced by cryopreservation: new insights and effect of a natural extract from Opuntia ficus-indica.

Objective: To analyze the effect of cryopreservation on sperm DNA fragmentation (SDF) in two cytometric sperm populations, PI(brighter) and PI(dimmer), and to test the effects of Opuntia ficus-indica (OFI) extracts, which contain antioxidants and flavanoids, and of resveratrol on cryopreservation of human semen.

Design: In vitro prospective study.

Setting: Institutional study.