Morfologia de órgãos do sistema digestório em codornas e os efeitos do jejum pós-eclosão

• Ano de defesa: 2018
• Autor(a) principal: Cruz, Flávia Kleszcz da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Departamento de Zootecnia; Programa de Pós-Graduação em Zootecnia; Maringá, PR; Centro de Ciências Agrárias
• Palavras-chave em Português: Sistema digestório - Aves; Codorna japonesa - Sistema digestório; Ciências Agrárias; Zootecnia
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/4702

Two experiments were carried out in order to evaluate the digestive system organs development and growth at 11th day of incubation up to 14 days post-hatch and the influence of post-hatch fasting on the performance and development of quails digestive system organs. In the experiment I, the objective was to evaluate the development and growth of digestive system organs, from the 11th day of incubation until the 14 days post-hatch in European and Japanese quail. Eggs from quails? breeders were selected by weight (European 11.80±0.59 and Japanese 9.79±0.49g) and incubated in an automatic incubator with 60% humidity and 37.6 °C, with automatic turning. On days 11, 13 and 15 of incubation, at hatch and at 4, 7, 10 and 14 days post-hatch, embryos or chicks of European and Japanese quails (n=6) were analyzed. The evaluated characteristic were analyzed by means of Bayesian Inference. The body weight was significantly heavier at 15 days incubation and after four days in European quails. The digestive system weight progressively increased with time and was similar between European and Japanese quails at 11, 13 and 15 days of incubation and 10 days post-hatch, in the others periods the European quails had higher weight. However, when analyzing the relative weight data, only at 15 days of incubation this difference was observed, showing that the digestive system develops proportionally similarly between quail types. For relative weight of the small intestine + pancreas, the weight of the proventriculus and gastric ventricle increased among ages analyzed in both types of quails, and at 14 days post-hatch European quails had higher weight of these organs. There were differences between quail types for duodenal villi height at 14 days, being higher in European and for villi height in jejunum at 10 days it was higher in Japanese quails. It is concluded that the development and growth of different digestive system organs up to 14 days of age is similar between European and Japanese quails, presenting equivalent relative weight. In quail the duodenum increases the villi up to 14 days, while the jejunum and ileum up to 10 and 4 days, respectively. In experiment II, the objective was to evaluate the effect of different periods of post-hatch fasting on animal performance and organ development of the European quail digestive system up to 35 days of age. For this, quail chicks born at the peak hatching and distributed in completely randomized design were used, with four treatments (control and three fasting periods of 24, 36 and 48 hours) and four replicates of 40 birds per experimental unit. The evaluated characteristics were analyzed by means of Bayesian Inference. In the period of 1-14 days, chicks submitted to post-hatch fasting periods had a reduction in weight gain as the feed restriction intensified. However, from the age of 15 days European quails showed a compensatory gain. For relative weight and length of the digestive system, the birds submitted to fasting had lower values than that fed. However, at 14 days, there was a recovery of the digestive system. The height of the duodenum villi showed a significant effect at 3 days of age with reduced heights from 36 hours of fasting, presenting recovery from 7 days. However, the height of the jejunum and ileum villi was not influenced by the fasting periods studied. It is concluded that the fasting period of up to 48 hours post-hatch influences the organs development of the European quail digestive system up to 7 days of age, but this one presents a compensatory gain from this period. Weight gain, feed conversion during the period of 1-35 days of age, intestinal mucosal epithelial integrity and muscle development are not influenced by post-hatch fasting period