Effect of estrus synchronization and artificial insemination on reproductive performance of Merino sheep
Braz. j. vet. res. anim. sci
;
39(3): 143-146, 2002. tab
Article
in English
| LILACS
| ID: lil-337737
ABSTRACT
The experiment was conducted to determine the reproductive performance (lambing rate and litter size) of sheep artificially inseminated at a synchronized estrus in relation to rams, dose of PMSG and number of artificial inseminations performed. During spring cyclic Merino adult ewes were treated with intravaginal sponges impregnated with 60 mg medroxyprogesterone acetate (MAP). After 14 days sponges were removed and the females received an intramuscular injection of either 375 or 400 IU pregnant mare serum gonadotropin (PMSG). Estrus detection was performed with vasectomized rams. Females in estrus were cervically inseminated with fresh diluted semen from different rams either once or twice. Data on lambing rate and litter size were recorded. Lambing rate was not affected by rams or number of inseminations. A higher proportion of ewes that received 400 IU PMSG lambed compared with those receiving 375 IU PMSG (76.47 percent v 54.32 percent; p<0.01). Litter size was not affected by any of the variables under study
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Sheep
/
Insemination, Artificial
Limits:
Animals
Language:
English
Journal:
Braz. j. vet. res. anim. sci
Journal subject:
Veterinary Medicine
Year:
2002
Type:
Article
Affiliation country:
Argentina
Institution/Affiliation country:
Universidad Nacional de Lomas de Zamora/AR
Similar
MEDLINE
...
LILACS
LIS