Synchronization of estrous using FGA internal pessaries and CIDR in Churra Galega Bragançana ewes
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The main goal of this paper was to compare the efficiency of FGA and CIDR in the synchronization of estrous in Portuguese CGB ewes. This study was performed at Braganza (latitude 41° 48’ 33’’N, longitude 6° 44’ 3’’W and Altitude 670 meters between April 1st and June 5th. Forty-nine CGB ewes aging between 2 to 8 years were divided in two groups - FGA (n = 26) and CIDR (n = 23). Body condition was scored according to the Australian classification table. In April 12th FGA ewes received a FGA (20 mg) internal pessary and CIDR ewes received a CIDR (0.35 g) device. Twelve days later internal pessaries and CIDR devices were removed and all ewes were injected with 500 UI of eCG. All ewes were artificially inseminated with chilled semen 53 + 1 hour post eCG injection. Initial ovarian cyclicity and ovarian response to treatments were assayed by progesterone plasmatic levels. Pregnancy diagnosis was performed by ultrasonography 41 days after artificial insemination (AI). About 87.8% (n = 43) of all ewes presented for at least once progesterone plasmatic level higher than 0.5
ng/ml in the two weeks prior to vaginal device insertion. Neither age nor body score condition affected
significantly the percentage of ewes initially cyclic (P>0.05). The percentage of ewes that did not lose the
vaginal device (FGA: 88.5% vs. CIDR: 91.3%; c2=0.5; P>0.05) or did not present vaginitis (FGA: 92.3% vs. CIDR: 95.7%c2=1.4; P>0.05) was identical in those treated with internal pessaries and with CIDR. All ewes presented progesterone plasmatic levels higher than 0.5 ng/ml for the first five days post-vaginal devices removal. About 81.6% of all ewes were pregnant 41 days after AI. The difference between treatments was not statistically significant (FGA: 84.6%vs. CIDR: 78.3%; c2=1.6; P>0.05). FGA internal pessaries and CIDR devices are very effective in the synchronization of estrous in CGB ewes.
