Reproductive performance of seasonally anovular mixed-bred dairy goats induced to ovulate with a combination of progesterone and eCG or estradiol

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 d...

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Bibliographic Details
Published in:Animal science journal 2016-06, Vol.87 (6), p.750-755
Main Authors: Contreras-Villarreal, Viridiana, Meza-Herrera, César A., Rivas-Muñoz, Raymundo, Angel-Garcia, Oscar, Luna-Orozco, Juan R., Carrillo, Evaristo, Mellado, Miguel, Véliz-Deras, Francisco G.
Format: Article
Language:English
Subjects:
anestrus season
Animal reproduction
Animals
Anovulation
Chorionic Gonadotropin - administration & dosage
Drug Combinations
Estradiol - administration & dosage
Estrus
Female
Flurogestone Acetate - administration & dosage
goat
Goats
Goats - physiology
Gonadotropins, Equine - administration & dosage
Hormones
Injections, Intramuscular
Male
ovarian and reproductive outcome
Ovary - diagnostic imaging
Ovary - physiology
Ovulation
Ovulation Induction - methods
Ovulation Induction - veterinary
ovulatory induction protocol
Pregnancy
Pregnancy, Animal
Progesterone - administration & dosage
Reproduction
Time Factors
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Summary: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
ISSN:1344-3941
1740-0929
DOI:10.1111/asj.12493