Aplicação hormonal no acuponto Bai Hui em protocolos de sincronização de ovulação em caprinos

Abstract

It was evaluated the effect of subdoses of equine chorionic gonadotropin (eCG) and prostaglandin F2a (PGF2a) in acupoint Bai Hui in ovulation synchronization protocols for goats. It were used 59 matrices which received intravaginal sponges with 60 mg of medroxyprogesterone acetate (MAP) for 6 days, associated with the 3 groups (G1), being: G1 (n = 20) received injections of 125 µg cloprostenol (100% of the dose) on the fifth day after placing the sponge and 300 IU eCG (100% of dose) at the time of sponge withdrawal of both applied intramuscularly (IM), G2 (n = 19) received injections of 37,5 µg cloprostenol (30% of dose) on the fifth day after placing the sponge and 90UI eCG (30% of dose) at the time of sponge removal, both applied in acupoint Bai Hui and G3 (n = 20) received injections of 37,5 µg cloprostenol (30% of dose) on the fifth day after placing the sponge and 90UI eCG (30% of dose) at the time of sponge removal, both applied false acupoint (IM). It were observed parameters of reproductive behavior, pregnancy rate, litter size and cost of the protocol. It was used the experimental design in randomized block design (RBD) for the variables IRIE; IRFE; pregnancy rate, prolificacy and estrus displaying. Data were not normally distributed, non-parametric Kruskal Wallis test was used. For the remainder of the variables the distribution was normal, proceeding to conducting analysis of variance at 5 % probability. There was no difference for any of the evaluated parameters: percentage of animals in estrus (G1 = 95.0 %, G2 = 94.7 %, G3 = 90.0 %), interval from sponge removal to onset of estrus (G1 = 24 6 ± 22.8 h, G2 = 33.9 ± 22.6 h, G2 = 39.8 ± 16.3 h), interval from sponge removal to the end of estrus (G1 = 70.5 ± 35.2 h, G2 = 80.9 ± 11.9 h, G3 = 80.8 ± 14.7 h), duration of estrus (G1 = 49.1 ± 26.6 h, G2 = 45.2 ± 12.9 h, G3 = 35.7 ± 13, 2h), pregnancy rate ( G1 = 70.0 %, G2 = 73.6 %, G3 = 75.0 %), prolificacy (G1 = 1.0 ± 0.0, G2 = 1.0 ± 0, 2, G2 = 1.0 ± 0.2) and cost per animal protocol, U.S. $ 9.62, U.S. $ 6.38, U.S. $ 6.38 for G1, G2 and G3, respectively. The administration of 30 % of the dose of PGF2a and eCG on acupoint Bai Hui or false acupoint (IM) in protocol of synchronization of ovulation in goats was efficient to synchronize estrus and ovulation, obtaining satisfactory pregnancy rate and litter size, with smaller cost protocol.