Paternal age negatively affects sperm production of the progeny

Parental age has profound consequences for offspring’s phenotype. However, whether patrilineal affects offspring sperm production remains unknown, despite the importance of male reproductive success in species facing post-copulatory sexual selection. Using a longitudinal dataset on ejaculate attributes houbara bustard, we showed that sired by old fathers had different age-dependent trajectories compared to young fathers. Specifically, they produced less (?48%) their first year life, and 14% during lifetime. Paternal strongest effect, with weak evidence grandpaternal or great effects. These results show paternal can affect reducing production, establishing an intergenerational link between ageing