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Product Development - Food Animal, Pharmacia Animal Health, Kalamazoo, MI 49001
Corresponding author:
J. R. Chenault; e-mail:
John.R.Chenault{at}Pharmacia.com.
An intravaginal progesterone insert (CIDR insert; 1.38 g of progesterone) was evaluated for synchronization of returns to estrus (SR), conception rate (CR), and pregnancy rate (PR) in dairy cows previously artificially inseminated (AI). Healthy, nonpregnant, lactating Holstein cows, 
40 and 
150 d postpartum at eight commercial farms were used. Cows detected in estrus and receiving AI 2, 3, or 4 d after one injection of PGF2
(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 AI). Cows were observed for returns to estrus from 18 to 26 ± 1 d after initial AI (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 cows in estrus (SR) during the 3 d after CIDR insert removal was contrasted to the highest 3-d cumulative percentage in estrus for controls. Cows conceiving to initial AI were omitted in calculations of SR, CR, and PR during resynchrony. Mucous scores of 3 or 4 (mild irritation) were observed in 65% of cows and a score of 5 (more severe irritation) was observed in 2%; otherwise, health was unaffected. The PR to initial AI was lower for cows 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%) cows did not differ significantly. The CIDR inserts improved synchrony of returns to estrus, slightly reduced PR to initial AI, but did not affect CR or PR to AI during the resynchrony period.
Key Words: intravaginal progesterone intravaginal insert • resynchronization of estrus • dairy cow
Abbreviation key: CIDR insert = intravaginal insert containing 1.38 g of progesterone, CIDR B = intravaginal insert containing 1.9 g of progesterone, CR = conception rate, EXD = experimental day, PR = pregnancy rate, PRpre = pregnancy rate to AI during the preenrollment period, SR = synchronization rate; percentage of cows in estrus on EXD 25 to 27
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