Treatment of swine summer infertility syndrome by means of oxytocin under field conditions

Effect of oxytocin treatment on the reproductive performance of sows after artificial insemination with liquid semen

“…The results of our study can also be compared with those obtained by Pena et al (10,12) during the summer season (sows were inseminated between July and September). The authors demonstrated significant differences (P ≤ 0.05) in farrowing rates between the control group (54.39%) and sows inseminated with oxytocin in seminal doses (73.02%).…”

“…This was also reported in another study conducted by Gibson et al (14). However, Pena et al (10,12) demonstrated an increased number of piglets born live (P ≤ 0.001) during the summer season, from 8.53 in a control group to 10.77 in a group with oxytocin added to semen. It is suggested that the addition of some hormones to semen increased the number of fetuses (24).…”

“…The problem of seasonal infertility in pigs is observed especially, but not only, in moderate climates (1). Research projects on the addition of hormones to semen during summer infertility come from the last decade (10)(11)(12)(13)(14). They mainly focus on using progestagens, gonadotropins, oxytocin, and prostaglandin and its derivatives.…”

The effect of numbers of frozen-thawed boar sperm and addition of prostaglandin F2α at insemination on fertility in pigs

“…Direct measurement of uterine contractions following prostaglandin administration have varied and include Please cite this article in press as: Knox reports of no difference from controls or other hormones tested (Willenburg et al, 2003) to increased contraction frequency, dose dependent effects on intrauterine pressure, but with lower magnitude of contractions compared with oxytocin and other prostaglandins . What is also notable is that oxytocin has been reported to increase sperm transport and fertility in swine (Peña et al, 1998;Okazaki et al, 2014) and in rodents (Nakata et al, 2012). Although the reason for the controversial and inconsistent effects of exogenous hormones administered at time of breeding to aid sperm transport are uncertain, it is possible that results could be affected by the hormone and dosage and the method and timing of administration.…”

Plasma levels of cortisol and oxytocin, and uterine activity after cervical artificial insemination in the ewe

“…These observations account for interspecies differences, since an OT release in response to mating has been demonstrated in sows [5], and results from a higher stimulation of the genital tract when intra-uterine deposition of semen occurs. Thus, in contrast with ewes, a physiological role for OT in sperm transport may be suggested in sows, because OT administration at the time of AI improved fertility in this species [33].…”