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Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen‐thawed semen
Author(s) -
Paulenz H.,
SÖderquist L.,
Ådnøy T.,
Nordstoga A. B.,
Andersen Berg K.
Publication year - 2005
Publication title -
veterinary record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.261
H-Index - 99
eISSN - 2042-7670
pISSN - 0042-4900
DOI - 10.1136/vr.156.12.372
Subject(s) - domestic sheep reproduction , insemination , semen , crossbreed , fertility , flock , estrous cycle , zoology , artificial insemination , cervix , gynecology , biology , medicine , obstetrics , andrology , pregnancy , sperm , veterinary medicine , population , genetics , environmental health , cancer
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 × 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.