Resumen

MADERO, S. et al. Efecto de dos dosis de cipionato de estradiol y del rango horario para la IATF sobre la tasa de preñez en vaquillonas*. Rev. vet. [online]. 2012, vol.23, n.1, pp.46-48. ISSN 1669-6840.

The objective of this work was to evaluate the effect of two doses of estradiol cypionate (ECP) and two intervals for insemination upon pregnancy rate at FTAI. A total of 326 black and red Angus heifers (BA and RA) with 24 months-old and a body score condition of 3.7±0.3 (m±ed) participated on the trial. On day 0 heifers received a progesterone intravaginal device (DIB, 0.5 g, Syntex) plus 2 mg estradiol benzoate (Estradiol 10, Río de Janeiro). On day 8, the intravaginal device was removed, 150 mg de D(+) Cloprostenol (Arsaprost, ARSA) were administered and animals were randomized to receive 0.5 or 1 mg ECP (group ECP05 and ECP1 respectively). On day 10 heifers received FTAI, for each treatment, at 48-52 h or 53-58 h after device removal. Semen of two bull (A and B) was used, which was distributed aleatory in each breed, treatment, and time range. Pregnancy diagnosis was performed by rectum palpation on day 63 after FTAI. The effect of breed (BA and RA), treatments (ECP05 and ECP1), bull (A and B), time range (48-52 y 53-58 h) and their interactions upon pregnancy rate at FTAI were evaluated. Variables were analyzed using PROC CATMOD of SAS, significance was indicated by a probability of p0.05) upon pregnancy rates at FTAI

Palabras clave : heifer; FTAI; estradiol cypionate; progesterone; time range; pregnancy rate.

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