RESUMO
The influence of the timing for the ablation of dominant follicle(s) prior to superovulatory treatment, and its effect on ovarian follicular growth and embryo yield, still remain elusive in cattle. The present study was designed to evaluate the effects of: (1) the day of the estrous cycle, at mid-diestrus, for the onset of superstimulation of follicular development, (2) the presence or absence of large ovarian follicles (ovary status) and (3) the time of follicular ablation, in hours, prior to the superovulatory treatment, on the superovulatory response in cattle. From a total of 244 superovulatory treatments and embryo collections in nulliparous and multiparous females, 76 were conducted after follicular ablation using a simplified transvaginal puncture cannula. Results from the present study indicated that the presence of large palpable follicle(s) at the onset of superstimulation of follicular development markedly reduced the superovulatory response. In addition, follicular ablation at 0 h or at 24 h prior to the onset of the superstimulation treatment significantly increased the number of total viable embryos. However, superovulatory responses were not affected by the day of the estrous cycle for the onset of follicular superstimulation and by the animal category (heifers or cows). In conclusion, the ablation of palpable follicle(s) 24 h or immediately prior to the onset of gonadotropin treatment, from days 8 to 12 of the estrous cycle (day 0, behavioral estrus), increased the total number of transferable embryos per flushing in cattle.
Assuntos
Bovinos/fisiologia , Folículo Ovariano/fisiologia , Superovulação/fisiologia , Animais , Cloprostenol/farmacologia , Feminino , Hormônio Foliculoestimulante/farmacologia , Superovulação/efeitos dos fármacos , Fatores de Tempo , VaginaRESUMO
This is a report of a patient presenting with a hematoma compressing the right atrium in the immediate post-operative period and the diagnosis by echocardiography allowed prompt surgical treatment with reversibility of the hemodynamic failure. Echocardiography is an important tool in the diagnosis of post-operative complications and transesophageal echocardiography can be very helpful in this setting, where technically difficult transthoracic exams are the rule.