Retrospective analysis of elusive follicular aspirations taking into account the quantity and quality of oocytes in brangus bovines from a livestock establishment in the Alto Paraná department

Abstract

In order to carry out a retrospective analysis of successive follicular aspirations in brangus cows in a livestock establishment in the Alto Paraná department, records of 10 Brangus breed cows subjected to seven successive follicular aspirations without prior hormonal stimulation were used. In the same, the quantity and quality of oocytes obtained in the aspirations were evaluated. Regarding the number of aspirated oocytes, in an average interval of 45 days between aspirations, an average of 207 ± 14 oocytes was obtained. Statistical analysis was performed by making a random comparison between aspirations: first aspiration with fourth aspiration, finding no statistically significant differences (p> 0.05); then the 4th aspiration was compared with the 7th aspiration, resulting statistically significant (p <0.05). Regarding the number of viable oocytes per aspiration, an average of 206 ± 30 oocytes and 88 non-viable oocytes were obtained, which comparing the first with the fourth aspiration yield statistically significant results (p <0.05). Regarding oocyte quality, the results show a greater quantity of GIII oocytes, they were statistically analyzed in the following way: comparison between the first (22.4) and the fourth aspiration (20.1) of the quality of GI oocytes, GII, GIII, yielding statistically non-significant results (p> 0.05).