An intravaginal @entity1420 insert (CIDR insert; 1.38 g of @entity1420 ) was evaluated for synchronization of returns to estrus (SR), conception rate (CR), and pregnancy rate (PR) in dairy @entity291 previously @entity16406 ( @entity16406 ). Healthy, nonpregnant, lactating Holstein @entity291 , > or = 40 and < or = 150 d postpartum at eight commercial farms were used. @entity291 detected in estrus and receiving @entity16406 2, 3, or 4 d after one injection of PGF2alpha (25 mg) were assigned as either controls (n = 945), or to receive a CIDR insert (n = 948) for 7 d (14 to 21 +/- 1 d after @entity16406 ). @entity291 were observed for returns to estrus from 18 to 26 +/- 1 d after initial @entity16406 (resynchrony period) and were reinseminated if in estrus. Vaginal mucus on CIDR inserts (97.3% retention) at removal was scored: 1 = no mucus; 2 = clear; 3 = cloudy; 4 = yellow; and 5 = red or brown. Percentage of @entity291 in estrus (SR) during the 3 d after CIDR insert removal was contrasted to the highest 3-d cumulative percentage in estrus for controls. @entity291 conceiving to initial @entity16406 were omitted in calculations of SR, CR, and PR during resynchrony. Mucous scores of 3 or 4 (mild irritation) were observed in 65% of @entity291 and a score of 5 (more severe irritation) was observed in 2%; otherwise, health was unaffected. The PR to initial @entity16406 was lower for @entity291 subsequently receiving CIDR inserts than for controls (32.7 vs. 36.7%). The CIDR insert increased SR (34.1 vs. 19.3% in 3 d) and overall estrus detection (43% in 4 d vs. 36% in 9 d) compared with controls. For the 9-d resynchrony period, CR and PR for CIDR-treated (26.7, 12.2%) and control (30.9, 11.1%) @entity291 did not differ significantly. The CIDR inserts improved synchrony of returns to estrus, slightly reduced PR to initial @entity16406 , but did not affect CR or PR to @entity16406 during the resynchrony period.

Intravaginal @entity1420 insert to synchronize return to estrus of previously inseminated dairy XXXX .

@entity16406 :: ('MESH:D060437', 'Disease') :: ['artificially inseminated', 'AI'] @entity291 :: ('9913', 'Species') :: ['Cows', 'cows'] @entity1420 :: ('MESH:D011374', 'Chemical') :: ['progesterone']
@entity291 :: (9913,Species) :: ['cows']
