Comparative study on the beneficial effects of different dark length schedules on the incidence of ascites and metabolic parameters in fast growing broiler chickens

Increasing of oxygen consumption in fast growing broiler chickens is associated with the more pronounced occurrence of right ventricular hypertrophy and ascites. While, rearing of susceptible chickens in dark condition could reduce the metabolic rate of birds and hence the incidence of ascites. The present study was designed to investigate a comparative study on the influence of different dark-length schedules on the incidence of ascites and metabolic parameters in fast growing broiler chickens. A total of 1000 day-old [Pure Sir Broiler Line Arian] chickens were obtained and subjected to four different lighting programs. Dead birds were autopsied for the lesions of ascites. Weekly growth performance of chickens was determined and blood samples were taken, on days 7, 12, 21, 28, 35 and 42 of age for hormonal analysis. The incidence of ascites was clearly higher in birds subjected to normal lighting program compared with those of dark exposed chickens. Control chickens showed significantly higher body weight compared to the dark exposure group birds at day 21 of age, while it did not differ at days 28, 35 and 42 of age. Such differences was accompanied with the lower levels of plasma T3 and T4 concentrations in dark group chickens than to control chickens at the earlier age [days 12 and 21]. This phenomenon indicated a reduction of metabolic rate and oxygen consumption in dark group chickens that had been led to reducing of ascites incidence. Our data proves that increasing dark-length instead of continuous lighting may be beneficial for rearing of broiler chickens, especially, when the risk of ascites incidence is higher

[Unicystic ameloblastoma: differential diagnosis and treatment planning]

Unicystic ameloblastoma is a tumor of odontogenic origin. It is not a rare neoplasm and most often the lesion is asympthomatic. However, large lesions may cause painless swelling of the jaws. Here we report a case of unicystic ameloblastoma with pain, swelling of the posterior jaws along with teeth mobility. Samples of incisional biopsy of the lesion and also interaoperative frozen section were sent for pathology and for both samples pathology report was solid ameloblastoma. Due to observing a thick fibrotic wall during the operation, the surgeon decided to perform enucleation. Knowing histopathologic variations of odontogenic tumors and also knowledge about differential diagnosis and clinical and radiographic features can lead to appropriate diagnosis and treatment planning