Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias
Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias
Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias
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16 t h International Congress on Animal <strong>Reproduction</strong><br />
176 Poster Abstracts<br />
P450<br />
Factors affect<strong>in</strong>g pregnancy rates follow<strong>in</strong>g fixed-time AI<br />
<strong>in</strong> beef cattle <strong>in</strong> Argent<strong>in</strong>a<br />
Cutaia, L 1 *, Lopez, P 2 , Vi<strong>de</strong>la Dorna, I 2 , Leblic, D 2 , Castagneto, N 2 , Diaz, T 2 ,<br />
Bo, GA 1<br />
1Instituto <strong>de</strong> Reproduccion Animal Cordoba (IRAC), Argent<strong>in</strong>a; 2 Syntex SA,<br />
Argent<strong>in</strong>a<br />
Field data on 54,457 <strong>in</strong>sem<strong>in</strong>ations <strong>in</strong> 396 herds were analyzed to<br />
<strong>de</strong>term<strong>in</strong>e the factors that affected pregnancy rates follow<strong>in</strong>g fixedtime<br />
AI (FTAI) of beef cattle <strong>in</strong> Argent<strong>in</strong>a between 2004 and 2006.<br />
Cattle were treated by 39 different veter<strong>in</strong>arians with a new or onceused<br />
progesterone releas<strong>in</strong>g <strong>de</strong>vice (1.0 g progesterone; DIB, Syntex,<br />
Argent<strong>in</strong>a) for 7 or 8 days, comb<strong>in</strong>ed with 2 mg estradiol benzoate<br />
(EB, Syntex) at DIB <strong>in</strong>sertion, 150 µg D(+) cloprostenol (Ciclase,<br />
Syntex) at DIB removal and 1 mg EB 24 h later. Cattle were FTAI 52<br />
to 56 hours after DIB removal. Lactat<strong>in</strong>g beef cows <strong>in</strong> poor body<br />
condition also received 400 IU eCG (Novormon, Syntex) at DIB<br />
removal. Pregnancy rates were <strong>de</strong>term<strong>in</strong>ed 30 to 60 days follow<strong>in</strong>g<br />
FTAI by ultrasonography or rectal palpation. Data were analyzed by<br />
logistic regression. The overall pregnancy rate was 49.5%. Body<br />
condition score was not <strong>in</strong>clu<strong>de</strong>d <strong>in</strong> the mo<strong>de</strong>l because of<br />
<strong>in</strong>consistencies <strong>in</strong> methodology and scor<strong>in</strong>g among veter<strong>in</strong>arians.<br />
Breed significantly <strong>in</strong>fluenced pregnancy rates (P