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Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen-thawed semen
  1. H. Paulenz, DVM, PhD1,
  2. L. SÖderquist, DVM, PhD2,
  3. T. Ådnøy, CandAgric, PhD3,
  4. A. B. Nordstoga, DVM1 and
  5. K. Andersen Berg, DVM, PhD4
  1. 1Team Semin, PO Box 8146 Dep, NO-0033 Oslo, Norway
  2. 2Department of Obstetrics and Gynaecology, Faculty of Veterinary Medicine, Centre for Reproductive Biology in Uppsala, Swedish University of Agricultural Sciences, Uppsala, Sweden
  3. 3Department of Animal Science, Agricultural University of Norway, Ås, Norway
  4. 4Department of Reproduction and Forensic Medicine, Norwegian School of Veterinary Science, Oslo, Norway

Abstract

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 106 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.

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