Efecto de diferentes ésteres de estradiol utilizados para sincronizar la ovulación sobre el porcentaje de preñez a la IATF en vacas Angus

P Veiga; R Chayer; G Uslenghi; J Montiel; S Callejas

Authors

P Veiga
R Chayer
G Uslenghi
J Montiel
S Callejas

Keywords:

Cipionato de estradiol, Benzoato de estradiol, Inseminación Artificial a tiempo fijo, Porcentaje de preñez

Abstract

The estradiol cypionate (ECP) allows animals inseminated at fixed time (FTAI) performing three enclosures. Recently there have been varying results, therefore, the objective of this work was to evaluate the use of ECP administered at device removal upon pregnancy rate after FTAI. Two trials were conducted (E1 and E2), using 273 lactating beef cows. On day 0 cows received a progesterone intravaginal device plus EB. On day 8, the intravaginal device was removed, cows received a luteolytic dose of PGF and were randomized to receive either ECP at 0 h or EB at 24 h. On day 10, 50-53 h after device removal, fixed-time artificial insemination was performed using frozen/thawed semen of proven fertility bulls (EI: GS y SE; EII: M y ME) and two inseminators. Pregnancy diagnosis was performed on day 40 by ultrasonografy. Pregnancy rates were not different between treatments (ECP: 55,17%; EB:58,59 %), inseminators (T: 54,79%; A: 59,06%) and bull (E1: GS: 55,3% y SE: 60,0%; E2: M:51,5% y SE: 59,1%). Interactions were not significant (P>0,05). In conclusion, according to our finding, estradiol cypionate could be used instead of estradiol benzoate to synchronize ovulation without affecting the pregnancy rate at fixed timed artificial insemination.

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