Pregnancy Rates in Early Postpartum Suckling Nellore Cows Reusing Intravaginal Progesterone Implants up to Four Times

Barbara Loureiro, Isaac Santos Gil, Isaac Santos Gil, Bhárbara Delboni Stur, Bhárbara Delboni Stur, Marcel Ferreira Avanza, Marcel Ferreira Avanza, Tracy Ferreira Lacerda, Tracy Ferreira Lacerda, Douglas Haese, Douglas Haese

Abstract


Numerous factors can prolong postpartum anestrus, affecting productivity and economic returns of the bovine industry. To improve reproductive performance a variety of hormonal combinations are used, a vast majority of these protocols use progesterone in which correspond to the greater costs of the protocols. An alternative to reduce the cost of such protocols is through the re-use of progesterone implants. A total of 422 multiparous cows, calved between 40 to 60 days with body condition score between 2.0 and 3.0 (scale of 1-5) were used in the experiment. The animals were divided into four groups randomly (1st, 2nd, 3rd and 4th use implant) and synchronized for FTAI. Pregnancy rate was evaluated at 45 days by ultrasound. In general, pregnancy rate was 44.7% (188/422). No significant difference (P>0.05) was found between cows in the four groups.


Keywords


bovine, Nellore, pregnancy, progesterone

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