Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen-thawed semen.
The effect of vaginal and cervical deposition of frozen-thawed semen on the fertility of sheep was tested in a field trial in which 543 Norwegian crossbred ewes aged between six months and five-and-a-half years from 10 farms were inseminated after natural oestrus. Cervical insemination with 200 x 10(6) spermatozoa resulted in 25-day non-return and lambing rates of 75.4 and 72.7 per cent, respectively, and vaginal insemination gave rates of 71.3 and 67.4 per cent; the cervical inseminations produced significantly higher lambing rates (P=0.04). There were significant differences between the lambing rates for different rams (P=0.006) and different farmers (P=0.003), and there was a significant interaction between farmer and deposition site (P=0.03). After vaginal insemination fertility was encouragingly high, but the results varied with the farmer, and different flock and management conditions.
Paulenz
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Team Semin, PO Box 8146 Dep, NO-0033 Oslo, Norway.
Söderquist
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L
Adnøy
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T
Nordstoga
A B
AB
Andersen Berg
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K
D000818:Animals; D002584:Cervix Uteri / Q000502:physiology; D005260:Female; D005298:Fertility / Q000502:physiology*; D005615:Freezing; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary*; D008297:Male; D012661:Semen / Q000502:physiology*; D012662:Semen Preservation / Q000662:veterinary*; D012756:Sheep / Q000502:physiology*; D014621:Vagina / Q000502:physiology