Efeitos da progesterona exógena na produção in vitro de embriões em novilhas Nelore pré-púberes

• Autor(a) principal: Corrêa, Rafael Rodrigues [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/128031; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/17-09-2015/000849551.pdf
• topic: Bovino - Reprodução; Oócitos; Corpo lúteo; Puberdade; Progesterona; Corpus luteum

Progesterone has been used for various purposes in the animal reproduction. The objective of this study was to evaluate the influence of exogenous progesterone injection in the number of recovered oocyte, oocyte quality and embryo production of prepubertal Nelore heifers. We used 31 females (18 to 20 months) non pregnant and without corpus luteum (CL). Cows were divided in 3 groups in a cross-over design: Group I P0 (n=11), animals received two placebo solution applications (1 mL), 7-day interval and starting 14 days (D-14) before the first aspiration (D-0); Group II P7 (n=10) treated group, the animals received a placebo solution application (1 mL) 14 days (D-14) and injecting progesterone (P4; 150 mg) 7 days (D-7) before aspiration; Group III P14 (n = 10), animals received two injections of P4 (150mμg) with an interval of 7 days, the first 14 days (D-14) and the second 7 days (D-7) before aspiration. We conducted 3 aspiration with 28-day intervals. The animals with CL during the experiment were placed in a separate group to be analyzed and compared with the group without CL. The recovered oocytes were selected and submitted to the procedures of the in vitro embryo production (IVEP). After confirming the homocedasticity (BoxCox) and normality (Cramér-von Mises test) of the data, carried out the analysis of variance (ANOVA). Tukey's test was used to compare the means of the variables and the pearson correlation test was used for correlations of the data, considered significant when p ≤ 0.05. There were no significant differences (p> 0.05) in the number of oocytes retrieved (total oocytes), viable oocytes (GI, II, III), between the animals treated (P7 and P14 groups) and animals that did not receive P4 (P0 group). The animals showed an average of 14.98 ± 10.82 oocytes collected by aspiration session. The mean and standard deviation of rates (%) of viable oocytes and embryos produced did not differ (p> 0.05) between groups. The ...