Influence of the Boar and Ejaculation Frequency on Pregnancy Rate and Embryonic Survival in Swine1

The effect of postulating diet intake on embryonic and fetal survival, and litter size in gilts

“…The death loss during parturition (stillbirth), as based on the average ovulation rate of 13.3 for all slaughtered gilts, was 4.5%, for a total death loss of 25.6%. The absence of a sire effect and the hish overall embryonic survival in this study isln contrast to the observations of Swierstra and Dyck (1976). Based on the observations of Tilton and Cole (1982) Swierstra and Dyck (1976 Madsen and Greve (1990) and considerably less than the average of 33.2% at 105 d of gestation reported by Etienne et al (1983) and the estimate of 40-50% mortality quoted by Pope and First (1985) in their review.…”

“…The absence of a sire effect and the hish overall embryonic survival in this study isln contrast to the observations of Swierstra and Dyck (1976). Based on the observations of Tilton and Cole (1982) Swierstra and Dyck (1976 Madsen and Greve (1990) and considerably less than the average of 33.2% at 105 d of gestation reported by Etienne et al (1983) and the estimate of 40-50% mortality quoted by Pope and First (1985) in their review. However, the relatively low mean death loss during gestation and absence of distinct dietary treatment and breed effects on embryonic and fetal survival, suggest that the death loss problem is due to the relatively high incidence of death losses in a minority of the gilts.…”

Comportamento de monta e características seminais de suínos jovens landrace e large white

“…Essa recomendação foi elaborada com base nos dados fisiológicos obtidos em trabalhos realizados principalmente entre as décadas de 60 e 80 em rebanhos europeus (SWIERSTRA, 1968a;SWIERSTRA & DYCK, 1976;FLORCRUZ & LAPWOOD, 1978;CAMERON, 1987) e com animais que apresentavam desempenhos de crescimento inferiores aos observados na suinocultura moderna. A habilidade de montar e produzir ejaculados férteis são componentes importantes na decisão de utilizar um macho na reprodução.…”

Frequency of Boar Ejaculate Collection and its Influence on Semen Quality, Pregnancy Rate and Litter Size

“…Sperm production and its quality are influenced by many environmental factors such as the season (Love et al 1993;Ciereszko et al 2000;Corcuera et al 2002), breed (Borg et al 1993), age (Swierstra 1973), photoperiod (Sancho et al 2004;Andersson et al 1998), ambient temperature (Corcuera et al 2002), food intake (Kemp et al 1988), breed and testis size (Colenbrander et al 1990;Colenbrander et al 1993). One of the most important factors is the collection frequency, which determines both quantity and quality of sperm and, presumably, the number of spermatozoa in the ejaculate (Swierstra and Dyck 1976). Ejaculate volume, sperm concentration and total sperm per ejaculate were reported to be significantly lower when ejaculates were collected at 24 h than 72 h intervals while the pregnancy rate was significantly higher in sows inseminated with semen collected at 24 h intervals than in sows inseminated with semen obtained at 72 h collection intervals (Swierstra and Dyck 1976).…”

“…One of the most important factors is the collection frequency, which determines both quantity and quality of sperm and, presumably, the number of spermatozoa in the ejaculate (Swierstra and Dyck 1976). Ejaculate volume, sperm concentration and total sperm per ejaculate were reported to be significantly lower when ejaculates were collected at 24 h than 72 h intervals while the pregnancy rate was significantly higher in sows inseminated with semen collected at 24 h intervals than in sows inseminated with semen obtained at 72 h collection intervals (Swierstra and Dyck 1976). The volumes of semen, sperm concentration and total number of sperms in the ejaculate were reported to be significantly larger at a collection frequency of 3 times per week than at 48 h intervals (Cameron 1985a;Cameron 1985b).…”