MÁXIMO, V. T.; MÁXIMO, Vinicius Tenório.
Resumen:
The present study aimed to use four protocols based progestogen implants in estrous
synchronization in ewes submitted to artificial insemination at fixed time, comparing the
effect of using protocol-based implants progestins to synchronize short and conventional
protocol long term, comparing different doses of equine chorionic gonadotropin (eCG) in
response to synchronization of estrus in ewes. 20 animals were used Santa Ines aged 3 and 5
years, respectively, and body score 3.As females were randomly divided into four groups
according to the protocol of hormonal synchronization of oestrus being used. Group 1: Use of
intravaginal based medroxyprogesterone acetate (MAP) for 12 days in association
intramuscular injection of 200 IU eCG (Novormon, Coopers) on the day of implant removal.
Group 2: Use of intravaginal based medroxyprogesterone acetate (MAP) for 12 days
associated with intramuscular administration of 250 IU eCG (Novormon, Coopers) on the day
of implant removal. Group 3: Use of intravaginal based medroxyprogesterone acetate (MAP)
for 07 days associated with intramuscular injection of 200 IU eCG (Novormon, Coopers) on
the implant removal Group 4: Using the base intravaginal medroxyprogesterone acetate
(MAP) for 07 days associated with intramuscular administration of 250 IU eCG (Novormon,
Coopers) on the day of implant removal. The females were artificially inseminated between
50-56 hours after implant removal. There was no significant difference between treatments in
both groups. The four estrous synchronization protocols with transcervical insemination were
effective in improving herd sheep.
