Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen-thawed semen.
Vet Rec
; 156(12): 372-5, 2005 Mar 19.
Article
em En
| MEDLINE
| ID: mdl-15816181
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 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.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Sêmen
/
Preservação do Sêmen
/
Ovinos
/
Inseminação Artificial
/
Fertilidade
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article