Control de la actividad reproductiva en ovejas de raza churra galega bragançana - efecto del momento de la administración de ECG

• T. Correia ^[1] ; D. Venancio ^[2] ; J. Acevedo ^[3] ; R. Mauricio ^[2] ; R. Valentim ^[2]
  1. [1] CIMO
  2. [2] IPB-ESA
  3. [3] UTAD

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• Localización: XV Jornadas sobre Producción Animal: 14 y 15 de mayo de 2013, Zaragoza / Jorge Hugo Calvo Lacosta (aut.), Isabel Casasús Pueyo (aut.), Margalida Joy Torrens (aut.), Javier Álvarez Rodríguez (aut.), Luis Varona Aguado (aut.), Begoña Panea Doblado (aut.), Carlos Calvete Margolles (aut.), Joaquim Barcells Teres (aut.), Vol. 1, 2013, ISBN 978-84-695-7684-7, págs. 350-352
• Idioma: español
• Títulos paralelos:
  • Control of breeding activity in portuguese churra galega bragançana ewes - effect of time at ECG administration
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  • Texto Completo Libro  1 (pdf)   2 (pdf) 
• Resumen

  • This work aimed to compare two different protocols - FGA + eCG and melatonin + FGA + eCG - commonly used to control the breeding activity in Churra Galega Bragançana ewes. The effect of time at eCG administration - 24 hours before or at sponge withdraw - was also assessed. In March, 94 adult ewes were randomly divided in two groups: 25 received a subcutaneous implant of melatonin (18 mg) as the others 69 got no treatment (Control). Forty-five days afterward a vaginal sponge (20 mg of FGA) was inserted in all ewes. Sponges were removed 12 days later. Thirty-two Control ewes were injected with 500 IU of eCG 24 hours before sponge withdraw. The remaining 37 Control and all Melatonin ewes were injected with 500 IU of eCG at sponge removal. FGA + eCG treatment was effective in controlling the breeding activity. Exogenous melatonin added no significant effect to FGA + eCG treatment. The injection of eCG 24 hours before sponge withdraw had no significant effect in the percentage of ewes presenting plasmatic levels of progesterone higher than 0.5 ng/ml, but decreased the percentages of ewes in estrus and pregnant and the interval between sponge withdraw and estrus detection.