title: The effect of post-ovulatory artificial insemination on sow reproductive performance.
abstract: In order to increase reproductive performance, sows are usually inseminated several times during oestrus. In practice, this results in a significant number of sows receiving one or more post-ovulatory inseminations. This study was carried out to determine the percentage of sows that receive one or more post-ovulatory inseminations and the effect of such treatment on reproductive performance. The results were analysed from a total of 1298 sows on two farms. It was observed that more than 70% of the sows received at least one post-ovulatory insemination and approximately 20% received two or more. There was no observed effect on the rate of return to oestrus, farrowing rate or litter size (p > 0.05).
authors.affiliation: Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul Porto Alegre-RS, Brazil.
authors.forename: C D
authors.initials: CD
authors.lastname: Castagna
authors.forename: C H
authors.initials: CH
authors.lastname: Peixoto
authors.forename: F P
authors.initials: FP
authors.lastname: Bortolozzo
authors.forename: I
authors.initials: I
authors.lastname: Wentz
authors.forename: F
authors.initials: F
authors.lastname: Ruschel
authors.forename: G B
authors.initials: GB
authors.lastname: Neto
mesh_terms: D000818:Animals; D001938:Brazil; D005260:Female; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary*; D010060:Ovulation / Q000502:physiology*; D011247:Pregnancy; D012098:Reproduction / Q000502:physiology*; D013552:Swine / Q000502:physiology