142 Possible Benefit of Intracytoplasmic Sperm Injection on the Efficiency of Embryo Production in Aged Cows.

Reduction in oocyte quality is a major factor responsible for declining fertility with age. The abnormal fertilization rate of oocytes from aged cows was reportedly higher than that of oocytes from young cows (Iwata et al. 2011. Reprod. Fertil. Dev. 23, 424-432). We hypothesised that assisted fertilization by intracytoplasmic sperm injection (ICSI) might… (More)