InVet. 2011, 13(2): 39-45 ISSN 1514-6634 (impreso) PROGESTERONA Y CIPIONATO...

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Three experiments were conducted (EI, n: 209; EII, n: 208; y EIII, n: 188) using Angus heifers in order to compare the use of estradiol cypionate (EC) at device removal or estradiol benzoate (EB) 24 h after in a FTAI protocol. On day 0 heifers received a progesterone intravaginal device plus EB. On...

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Detalles Bibliográficos
Autores principales: Veiga, P., Montiel, J., Chayer, R., Uslenghi, G., Callejas, S.
Formato: Artículo publishedVersion
Lenguaje:Español
Publicado: Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. 2011
Materias:
progesterona
cipionato de estradiol
vaquillonas
IATF
preñez
progesterone
estradiol cipionate
heifers
FTAI
pregnancy
Acceso en línea:http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=pveterinaria/invet&cl=CL1&d=HWA_4257
https://repositoriouba.sisbi.uba.ar/gsdl/collect/pveterinaria/invet/index/assoc/HWA_4257.dir/4257.PDF
Aporte de:
Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Three experiments were conducted (EI, n: 209; EII, n: 208; y EIII, n: 188) using Angus heifers in order to compare the use of estradiol cypionate (EC) at device removal or estradiol benzoate (EB) 24 h after in a FTAI protocol. On day 0 heifers received a progesterone intravaginal device plus EB. On day 8, the intravaginal device was removed and heifers received a luteolytic dose of PGF. At device removal heifers were randomized to receive either EC at 0 h or EB at 24 h. On day 10, 50-53 h after device removal, fixed timed artificial insemination was performed using frozen/thawed semen of proven fertility (3 bulls for EI and 2 for EII and EIII) and two inseminators. Pregnancy rates were not different between treatments (EI: 67.8%; EII: 59.2%; EIII: 58.4%) or inseminators (p>0.05); however a bull effect was observed in experiments I (B: 47.8%; F: 75.0%; M: 72.0%; p<0.05) and II (M: 68.8%; ME: 48.5%; p<0.05), but not in experiment III (3609: 56.0; M: 60.6%; p>0.05). Interactions were not significant. 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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