title: Influence of sperm cell dose and post-insemination backflow on reproductive performance of intrauterine inseminated sows.
abstract: This study was carried out to evaluate the effects of the sperm cell dose and semen backflow on the pregnancy rate and number of embryos of sows inseminated once at 0-24 h before ovulation, using an intrauterine technique. The results were analysed from a total of 211 sows assigned to three groups inseminated with doses of 0.25 x 10(9) (T1), 0.5 x 10(9) (T2) and 1.0 x 10(9) (T3) spermatozoa. Semen backflow was observed in 95% of the females (143/151) evaluated for this purpose. The percentage of semen backflow is close to two-third of the volume and the percentage of sperm is around 15% of the infused sperm dose. Intrauterine insemination can be successfully performed provided that at least 0.5 billion of sperm cell dose is infused at an interval of 0-24 h before ovulation.
authors.affiliation: Departamento de Zootecnia, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Mezalira
authors.forename: D
authors.initials: D
authors.lastname: Dallanora
authors.forename: M l
authors.initials: Ml
authors.lastname: Bernardi
authors.forename: I
authors.initials: I
authors.lastname: Wentz
authors.forename: F P
authors.initials: FP
authors.lastname: Bortolozzo
mesh_terms: D000818:Animals; D005260:Female; D005306:Fertilization; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary*; D008297:Male; D011247:Pregnancy; D012661:Semen / Q000502:physiology*; D013076:Sperm Count; D013081:Sperm Motility; D013552:Swine / Q000502:physiology*; D016896:Treatment Outcome