Utilização do Eazi-Breed CIDR®, novo e reutilizado, em protocolos longos e curtos para sincronização do estro e da ovulação em ovelhas

Abstract

Two experiments were conducted to evaluate the use of Eazi-Breed CIDR® new and reused in long and short protocols in synchronization of estrus and ovulation in ewes. The first study evaluated the reproductive performance of ewes in the program of fixed-time artificial insemination protocol with progesterone protocol on short (five days) and long (twelve days) of progesterone in the synchronization of estrus and ovulation. 48 sheep were used randomly in two experimental groups and GC GL. Ewes were treated with Eazi- Breed CIDR®, for twelve days in the CG (n = 24) and five days in GL (n = 24). Upon removal of the device all the females of the groups received, by intramuscular 12.5 mg dinoprost tromethamine and 300 IU of eCG. All females were inseminated at fixed time by transcervical 50 hours after removal of the device. The synchronization of estrus occurred in 100% of the sheep and the diagnosis of pregnancy was performed at 30 days after insemination, however, the pregnancy rate was 33.3% and 41.7% in the GC% in the GL, not being observed statistical difference (P> 0.05). The results show that the protocols using short-and long Eazi-Breed CIDR® are satisfactory in synchronization of estrus inewes for artificial insemination in fixed time, but low rate of pregnancy. the second experiment, has been to evaluate the effect of re-use of intravaginal implants on the pregnancy of sheep. 55 sheep were used in Santa Inês breed. These were distributed randomly into three experimental groups and GI (Eazi-Breed CIDR® in the first use) and GII (Eazi-Breed CIDR® in the second use) for five and 12 days and GIII (Eazi-Breed CIDR® in the third use) for five days. Ewes were treated with an progesterone Eazi Breed CIDR® inserted in the anterior portion of the vagina and after implant removal was applied 300UI of equine chorionic gonadotropin, and 12.5 mg of tromethamine dinoprost, both through intramuscularly. Synchronization of estrus occurred in 100% of ewes in all groups GI, GII and GIII. The diagnosis of pregnancy by ultrasound was performed at 30 days after the coverage and rate of pregnancy of the GI was 82 and 91%, GII 91% for both treatments and in GIII 82% not being observed differences statistics (P> 0.05). The results show thatthe protocols with short and long Eazi-Breed CIDR® reused is satisfactory in the reproductive performance of crossbred sheep of Santa Inês.