title: Reproductive performance of seasonally anovular mixed-bred dairy goats induced to ovulate with a combination of progesterone and eCG or estradiol.
abstract: Adult goats (n = 32) were randomly assigned to one of four treatments (n = 8, each): (i) progesterone (P4 ) + equine chorionic gonadotropin (eCG), treated with 25 mg progesterone intramuscularly (i.m.) + 250 IU eCG 24 h later; (ii) cronolone + eCG, treated with vaginal sponges - 20 mg cronolone × 7 days + 250 IU eCG at pessary removal; (ii) P4 + estradiol (E2 ), treated with 25 mg progesterone i.m. + 1 mg estradiol 24 h later; (iv) cronolone + E2 , treated with vaginal sponges - 20 mg cronolone × 7 days + 1 mg of estradiol i.m. at pessary removal. Goats were tested for estrus throughout the presence of a buck. Seven days prior and after treatment, an ovarian ultrasonographic scanning was performed to determine ovarian function and structures. An ultrasonographic pregnancy diagnosis was performed on day 30 post-service. In all groups, 100% estrus response was observed within 96 h post-treatment. While ovulation occurred in 100% of P4 + eCG and cronolone + eCG treated goats, the other groups only depicted 50% ovulatory activity (P < 0.05). Pregnancy rate was higher (P <0.05) in the P4 + eCG and cronolone + eCG groups (88 and 100%, respectively), compared with 38% in P4 + E2 and cronolone + E2 groups. The best treatments were those in which eCG was applied. The P4 + eCG treatment was a pessary-free, cheaper and effective protocol to induce ovulation in goats during the seasonal anovulatory period.
authors.affiliation: Departamento de Ciencias Médico Veterinarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, México.
authors.forename: Viridiana
authors.initials: V
authors.lastname: Contreras-Villarreal
authors.affiliation: Universidad Autónoma Chapingo, Unidad Regional Universitaria de Zonas Áridas, Bermejillo, Durango.
authors.forename: César A
authors.initials: CA
authors.lastname: Meza-Herrera
authors.affiliation: Instituto Tecnológico de Torreón, Torreón, Coahuila, México.
authors.forename: Raymundo
authors.initials: R
authors.lastname: Rivas-Muñoz
authors.affiliation: Departamento de Ciencias Médico Veterinarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, México.
authors.forename: Oscar
authors.initials: O
authors.lastname: Angel-Garcia
authors.affiliation: Centro de Bachillerato Tecnológico Agropecuario, N° 1, Torreón, Coahuila, México.
authors.forename: Juan R
authors.initials: JR
authors.lastname: Luna-Orozco
authors.affiliation: Instituto Tecnológico de Torreón, Torreón, Coahuila, México.
authors.forename: Evaristo
authors.initials: E
authors.lastname: Carrillo
authors.affiliation: Departamento de Nutrición Animal, Universidad Autónoma Agraria Antonio Narro, Saltillo, Coahuila, México.
authors.forename: Miguel
authors.initials: M
authors.lastname: Mellado
authors.affiliation: Departamento de Ciencias Médico Veterinarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, México.
authors.forename: Francisco G
authors.initials: FG
authors.lastname: Véliz-Deras
mesh_terms: D000818:Animals; D000858:Anovulation; D006063:Chorionic Gonadotropin / Q000008:administration & dosage*; D004338:Drug Combinations; D004958:Estradiol / Q000008:administration & dosage*; D004971:Estrus; D005260:Female; D003425:Flurogestone Acetate / Q000008:administration & dosage; D006041:Goats / Q000502:physiology*; D006064:Gonadotropins, Equine / Q000008:administration & dosage*; D007273:Injections, Intramuscular; D008297:Male; D010053:Ovary / Q000000981:diagnostic imaging / Q000502:physiology; D010060:Ovulation; D010062:Ovulation Induction / Q000379:methods* / Q000662:veterinary*; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000008:administration & dosage*; D012098:Reproduction; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin; D004338:Drug Combinations; D006064:Gonadotropins, Equine; D011374:Progesterone; D004958:Estradiol; C006116:chorionic gonadotropin, pregnant mare serum gonadotropin drug combination; D003425:Flurogestone Acetate
keywords: anestrus season; goat; ovarian and reproductive outcome; ovulatory induction protocol