Duration of estrus and preovulatory surge of LH in Boer x Nubian goats synchronized with various hormones in tropical latitude of Mexico

• José del Carmen Rodríguez-Castillo ^[1] ; Arturo Pro-Martínez ^[2] ; Arnulfo Villanueva-C. ^[3] ; Jaime Gallegos-Sánchez ^[2]
  1. [1] Benemérita Universidad Autónoma de Puebla

     Benemérita Universidad Autónoma de Puebla

     México

     
  2. [2] Ciencia Animal-Colegio de Postgraduados
  3. [3] Facultad de Medicina Veterinaria y Zootecnia-BUAP

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• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 18, Nº. 1-2, 2010
• Idioma: inglés
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• Resumen

  • The objective was to determine the duration of estrus, preovulatory surge of luteinizing hormone (LH), fertility and prolificacy of Boer x Nubian goats in tropical Mexico (19º29’LN) synchronized with fluorogestone acetate (FGA) and prostaglandin F2 (PGF2) combined with gonadotrophin-releasing hormone (GnRH) or equine chorionic gonadotrophin (eCG). The treatments were: T1 (FGA, n = 5), T2 (FGA + GnRH, n = 7), T3 (FGA + eCG, n = 8), T4 (PGF2 + GnRH, n = 5) and T5 (PGF2 + eCG, n = 7). The responses measured were percentage of animals showing estrus, duration of estrus (h), fertility (%), prolificacy (kids/parturition); intervals (h) from end of treatment til estrus and til peak preovulatory LH concentration, from onset of estrus til peak LH; duration of peak LH (h), and LH concentration (ng/mL). Duration of estrus was longest in goats of T3 (35.2 ± 1.4). Onset of estrus differed (P