Fertilization rate and number of embryos on day 2 after intrauterine and deep intrauterine insemination using frozen-thawed boar semen in multiparous sows

Abstract

The present study determines fertilization rate and number of embryos on Day 2 after intrauterine insemination (IUI) and deep intrauterine insemination (DIUI) using frozen-thawed (FT) boar semen in multiparous sows. Twelve crossbred Landrace Yorkshire multiparous sows were included. The sows were inseminated at 24h after oestrus detection and reinseminated every 12h until ovulation took place. The inseminations were conducted using IUI with 2 ×109 FT sperm per dose (n = 6) and DIUI with 1 10 9 FT sperm per dose (n = 6). The sows were slaughtered at 45.1 ± 7.2 h after ovulation. Embryos and unfertilized oocytes were flushed from the oviducts. IUI yielded a better fertilization rate than DIUI (66.0 versus 31.0, P