Optimised insemination strategies on pig farms aim at reducing the number of inseminations, without reducing reproductive performance. At the moment, one insemination with good quality semen can result in good fertilisation results when insemination takes place in a 24 h period before ovulation. However, knowledge of this optimal period is not sufficient to limit the number of inseminations to ...

Acetylcholine, injected im into does immediately after natural mating, significantly increased the number of sperm recovered 1 h later from the vagina and cervices but not from the oviducts. Acetylcholine caused immediate increases in the frequency and amplitude of uterine contractions as measured by strain-gauge force transducers attached to the serosa and recorded by physiograph; contraction ...

The use of vaginal electrical resistance (VER) for estrous detection and early pregnancy diagnosis were evaluated using three experiments in dairy cattle, in Ethiopia. VER was measured: 1) during the natural estrous (n = 60) cycle, 2) during estrus induced by GnRH+ PGF2· (n = 11) and 3) during post insemination in dairy cows synchronized with GnRH+CIDR+PGF2· (n = 25). Results from Experiment 1 ...

Field data from Australian Angus herds were used to investigate 2 methods of analyzing uncertain binary responses for success or failure at first insemination. A linear mixed model that included herd, year, and month of mating as fixed effects; unrelated service sire, additive animal, and residual as random effects; and linear and quadratic effects of age at mating as covariates was used to ana...

The objective of this retrospective clinical study was to compare pregnancy rates obtained after the use of endoscopic-assisted transcervical catheterization (EIU) or laparotomy (SIU) for insemination of frozen-thawed dog semen. Healthy bitches from various breeds were inseminated with semen from multiple donors processed by different freezing centers. Data from 118 inseminations (78 EIU and 40...

The BOVINOSE project (www.bovinose.eu) aims to develop an “electronic nose” to detect estrus in a dairy cow, and thus to determine the optimal timing of artificial insemination. The physical principle is based on detection of sex pheromones that are secreted by the cow, exclusively during estrus. These pheromones are the natural olfactory signal for the bull that the cow is in heat. This techno...

Our objective was to evaluate the effect of a change in treatment protocols, suggested following an inspection visit by the regulatory authority, from single to double inseminations during donor insemination treatment cycles. We therefore conducted a retrospective audit of pregnancy rates in the reproductive medicine clinic of a major teaching hospital. All patients were treated for male factor...

In a prospective, randomized study of insemination with donor semen, intracervical insemination by straw was compared with insemination using a cervical cap with an intracervical reservoir. A total of 91 patients completed 486 treatment cycles. There were no significant differences in age, parity, indication for insemination by donor, or method of cycle monitoring between women who became pregn...