Reutilização de dispositivos intravaginais de progesterona autoclavados para a indução e sincronização de estro em cabras da raça Toggenburg

• Autor(a) principal: Souza, Joanna Maria Gonçalves de
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5712
• topic: Dispositivos intravaginais; Cabras; Anestro; Contra estação; Autoclaved intravaginal; Goats; Anestrus; Estrous; Against station; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMAL

This study aimed to evaluate the efficacy of reusing autoclaved intravaginal devices on induction of estrus, ovulation and fertility in Toggenburg goats, besides to measure the plasma progesterone (P4) profile in these animals. The study was performed during the seasonal anestrous period (n=42) and in the breeding season (n=67), at the City of Piau-MG (latitude 21°35 S and longitude 43°15 W). Goats received new intravaginal progesterone devices (CN), or devices used previously during six days (C6) or 12 days (C12) and then autoclaved. Dinoprost (5 mg) latero-vulvar was administered on the day of device insertion and eCG (200 IU) latero-vulvar was done 24 h before its removal. The devices were maintained for six days in all treatments. Ten goats from each treatment were evaluated by transrectal ultrasonography (5 MHz). Blood was collected at different moments for plasma P4 analysis. There was no statistical difference (P>0.05) among the goats of three treatments on the following reproductive parameters observed during the anestrous or breeding season, respectively (average for three treatments): mean estrous induction/synchronization rate (94.9; 76.2%), mean interval from device removal to estrus (33.1 ± 11.4; 37.4 ± 16.2 h), mean duration of estrus (28.6 ± 11.8; 31.7 ± 12.8 h), mean conception rate (61.5; 50.7%), mean ovulating female rate (95.2; 66.7%), mean number of ovulations (1.7 ± 0.7; 1.5 ± 0.6), mean interval from removal to ovulation (68.4 ± 13.0; 77.3 ± 13.8 h), interval from estrus to ovulation (36.6 ± 12.6; 36.7 ± 11.2 h), mean diameter of the dominant follicle (7.4 ± 0.6; 6.7 ± 0.5 mm), co-dominant (6.8 ± 0.6; 6.2 ± 0.1 mm) and medium (7.2 ± 0.6; 6.6 ± 0.4 mm). The small initial concentrations of P4 in alltreatments seven days before device insertion (0.12 ± 0.21) or at the time of insertion (0.23 ± 0.20) may be interpreted as a consequence of reproductive seasonality. Six hours after device insertion CN treatment showed higher (P<0.05) concentrations of P4 (7.16 ± 3.64) when compared to C6 (4.66 ± 2.13) or to C12 (4.34 ± 1.85) and these values remained greater in size up to four days after insertion. One day after device removal, plasma P4 concentration was at subluteal levels. Higher P4 concentrations (P<0.05) were detected in nulliparous when compared to lactating goats in different moments. The autoclave process did not affect the efficiency of reutilizing progesterone intravaginal device in reproductive parameters as fertility rate, induction and synchronization of estrus and ovulation in Toggenburg goats. The supraluteal concentration maintained in all treatments during the insertion device period allow inferring that the autoclave process does not influence progesterone concentration, being a viable alternative to reduce costs in a goat herd.