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Effect of deposition site and sperm number on the fertility of sheep inseminated with liquid semen
  1. H. Paulenz, DVM, PhD1,
  2. T. Ådnøy, PhD2,
  3. O. H. Fossen, DVM, PhD3,
  4. L. Söderquist, DVM, PhD4 and
  5. K. Andersen Berg, DVM, PhD5
  1. 1 Team Semin, PO Box 8146 Dep, NO-0033, Oslo, Norway
  2. 2 Department of Animal Science, Agricultural University of Norway, Ås, Norway
  3. 3 GENO Al Station Særheim, Sandnes, Norway
  4. 4 Department of Obstetrics and Gynaecology, Faculty of Veterinary Medicine, Centre for Reproductive Biology in Uppsala, Swedish University of Agricultural Sciences, Uppsala, Sweden
  5. 5 Department of Reproduction and Forensic Medicine, Norwegian School of Veterinary Science, Oslo, Norway


The effect of the deposition site and the numbers of sperm on the fertility of sheep was tested in a field trial in which 1292 Norwegian crossbred ewes aged between six months and five-and-a-half years from 52 farms were inseminated with liquid semen after natural oestrus. Cervical insemination with 150 x 106 and 75 x 106 spermatozoa resulted in 25-day non-return rates of 63.7 and 56.1 per cent, and vaginal insemination gave non-return rates of 63.3 and 56.6 per cent, respectively. There was no significant difference between the cervical and vaginal inseminations, but the inseminations with 150 x 106 spermatozoa gave significantly higher non-return rates (P=0.004). There were significant differences between the non-return rates for different rams (P<0.0001) and farmers (P=0.0002) but the age of the ewe had no significant effect.

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