Spontaneous electromyographic activity throughout the cycle in the sow and its change by intrauterine oestrogen infusion during oestrus

Abstract

Summary. Two experiments were carried out to monitor influences on the uterine electromyographic activity (EMG) 0\m=.\81;P < 0\m=.\01;n = 10) but not the frequency was observed. In Exp. 2 no significant change in contractile activity was found for the sal i ne\x=req-\ infused group and the controls over the 11-h recording periods. After infusion of saline with oestrogens the frequency increased significantly (P < 0\m=.\001) from 14\m=.\0\ m=+-\3\ m=. \ 1 contractions/h during the first hour up to a maximum of 31\m=.\2\m=+-\ 3\m=.\9/hat 2 h after infusion. Compared to the pretreatment period the frequency remained significantly elevated during the 3rd (28\m=.\7\ m=+-\2\m=.\3/h; P < 0\m=.\05) and 4th (20\m=.\2 \m=+-\ 3\m=.\9/h; P < 0\m=.\05) hour after infusion. Seminal oestrogens therefore stimulate uterine contractions at Day 0 and may play a physiological role for sperm transport.

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

“…The primary method for sperm transport is by uterine contractions which are affected by volume of inseminate and the estrogen content of the seminal plasma (Soede, 1993). Boar seminal plasma is high in estrogen which induces uterine contractions (Claus et al, 1989) through release of prostaglandin from the uterus (Claus, 1990;Willenburg et al, 2004). Estrogen also impacts the directionality of contractions and acts in conjunction with oxytocin (Shmygol et al, 2006).…”

“…Estrogen also impacts the directionality of contractions and acts in conjunction with oxytocin (Shmygol et al, 2006). Uterine contractions have characterized in swine (Langendijk et al, 2005) and while many studies show clear effects of estrogen (Claus et al, 1989;Willenburg et al, 2004) and oxytocin (Langendijk et al, 2003;Shmygol et al, 2006), the effects of exogenous prostaglandin are not so evident. Indirect measurement of a prostaglandin effect at time of mating arises from an increased reflux of semen following treatment and insemination (Langendijk et al, 2002;Willenburg et al, 2003).…”

“…Other approaches to improve FTS fertility have included the addition of seminal plasma (Okazaki et al, 2009;Garcia et al, 2010) and addition of hormones (Claus et al, 1989;Willenburg et al, 2004;Okazaki et al, 2014). Addition of estrogen to an inseminate causes release of prostaglandin from the endometrium and uterine contractions (Claus, 1990).…”

Low Dose Insemination in the Sow – A Review

“…In the ampulla of the oviduct, sperm cells interact with the oocytes and, after recognition, penetrate the zona pellucida and fertilize the oocyte. Sperm transport is a complex process, involving stimulation of the sow through the mating or insemination process itself, composition of the ejaculate or inseminate, activity and secretions of the female genital tract, hormones and immunogenic factors (Bower 1974; Einarsson 1980; Viring 1981; Claus et al 1989; Drobnis and Overstreet 1992). One critical factor is the direction of the myometrial waves that transport the inseminate towards the UTJ (Viring et al 1980), which depends on the status of the oestrous cycle (Zerobin 1968).…”

Desempenho reprodutivo de marrãs submetidas à infusão transcervical de plasma seminal no estro da cobertura

“…Essas, por sua vez, podem promover o transporte espermático passivo e induzir a ovulação (CLAUS et al, 1987(CLAUS et al, , 1989. Ao ser aplicado via transcervical no início do estro, o PS promove a antecipação da ovulação (WEITZE, 1990b), o que permite que a IA subseqüente se aproxime da ovulação, aumentando as chances de fecundação (WABERSKI, 1997).…”