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Wanessa Blaschi,Paula A. Lunardelli,Luciana S.R. Marinho,Marilu C. Max,Gustavo M.G. Santos,Katia C. Silva-Santos,Fabiana A. Melo-Sterza,Hernan Baldassarre,Thales R. Rigo,Marcelo M. Seneda 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.3
Synchronization of estrus and ovulation are of paramountimportance in modern livestock improvement programs. These methods are critical for assisted reproductiontechnologies, including artificial insemination and embryotransfer, that can increase productivity. In the current study,subcutaneous implants containing norgestomet were placedfor long (14 days), medium (9 days), and short (5 days)periods of time in 70 crossbred ewes undergoing fixed-timeartificial insemination. The resulting effects on estrussynchronization and conception rates were subsequentlyevaluated. Among the synchronized ewes, 85.7% (60/70)underwent estrus over a period of 72 h after progestagentreatment ceased. The shortest mean interval betweenwithdrawal of the device and onset of estrus (34.2 ± 8.9 h) wasobserved in the G14 days of P4 group (p < 0.05). Theconception rate of the G14 days of P4 group was statisticallyhigher than that of the other groups (83.3% vs. 60.9% vs. 47.8%; p < 0.05). In conclusion, 14 days of norgestomettreatment produced higher conception rates and a greaternumber of pregnancies at the beginning of the breeding season.