Digestibility of nitrogen and certain amino adds in fishmeals determined with intact or caecectomized roosters* Sapcota D.1, Johri T.S. Central Avian Research Institute, Izatnagar - 243 122. * Part of Ph.D thesis. 1Present address: Deptt. of Poultry Science, College of Veterinary Scienee, Guwahati-781 022. Abstract Ten samples of fish ineal were collected fonn various agencies across the country. These were precion-fed to intact or caecectomized roosters, separately. Digestibility of dry matter, nitrogen, lysine, methionine and tryptophan were detennined using true metabolizable energy bioassay. The dry matter digestibility ranged from 49.01 to 73.70% and 45.39 to 72.89% in intact and operated birds, respectively. In caecectomized roosters the dry matter digestibility was found to be significantly lower than that of intact counter-parts. The digestibility of nitrogen, lysine, methionine and tryptophan ranged from 55.55 to 79.83, 57.87 to 89.10, 57.98 to 92.75 and 45.02 to 91.06 with intact roosters and from 55.49 to 79.86, 57.81 to 89.09, 57.57 to 92.50 and 44.89 to 90.79% with operated roosters, respectively. There was no significant difference in digestibility of nitrogen, and amino acids between intact and operated birds in the samples. It could be concluded that the caecectomy had no influence on the digestibility of nitrogen, lysine, methionine and tryptophan except on dry matter digestibility. Top Key words Caecectomy, digestibility, fish meal, amino acids, dry matter, nitrogen. Top |