Bioscientifica Proceedings

Keywords: boar; fertility; semen; season; nutrition© 1990 Journals of Reproduction & Fertility Ltd...

Summary. In many species the appearance of oestrus is sufficient to ensure that the time of ejaculation, sperm transport and capacitation are balanced with the time of ovulation. In the pig these phenomena vary considerably and require additional regulatory mechanisms which are partly explained by seminal components.Boar semen is rich in oestrogens (up to 11.5 μg/ejaculate). Infusion of saline with the addition of oestrogens in ph...