Níveis de lisina digestível na fase pré-inicial para pintos de corte provenientes de ovos de diferentes pesos e idades de matrizes

• Autor(a) principal: SANTOS, Januária Silva
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000003qxr
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tde/860
• topic: aminoácido; digestibilidade; incubação; lisina digestível; amino acid; digestibility; digestible lysine; incubation; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA

In this research, we aimed to evaluate the digestible lysine levels in pre-starter diets in the histomorphological development of 18-day embryos and newborn chicks. The performance until 21 days and dry matter digestibility and nitrogen balance in pre-starter rations and allometry of digestible and immune organs until 14 days of age. Three experiments were performed in the Avian facilities and in the Preventive Veterinary Medicine Department of the Veterinary and Animal Science College of the Federal University of Goiás, Brazil, with fertile eggs obtained from breeders in different ages and eggs with different weights at the moment of hatching. In experiment 1, effect of breeder ages and egg weights in the internal quality was evaluated during incubation period and its relation with embryo development until hatch. In experiment 2 digestible lysine supplementation in pre-starter diets for chicks hatched from eggs of different breeder ages and in experiment 3 for chicks obtained from eggs with different weights at the first day of hatching period. A total of 320 day-old chicks were allotted in each experiment in a completely randomized design and factorial arrangement 2X4 (breeder age: 34 and 52 weeks or egg weight: 56-65g and 66-72g and digestible lysine levels: 1.1; 1.2; 1.3 and 1.4%). Embryos and newborn chicks were necropsied at 18 days of incubation, at seven and 14 days after hatch, and collected samples of the small intestine (duodenum e jejunum) to prepare histological slides and gastrointestinal organs weighed. At hatch, chicks were weighed and allotted in battery cages from four to seven days of age and the metabolic assay performed in total excreta collection. Performance variables performed were final chick weight, weight gain, feed intake and ffed conversion. Nitrogen balance and nitrogen and dry matter coefficientwere calculated. Villus height and crypt depth were determined in histological sldes of duodenum and jejunum. Data were submmited to variance analysis and polynomial regression performed for digestible lysine levels. In experiment 1, breeder age and egg weight showed negative correlations with Haugh unit and positive correlation to percenual of albumen, yolk and eggshell, with embryo weight at 18 days of incubation and chick weight at hatch. In experiment 2, no interaction was observed between breeder age and digestible lysine levels in pre-starter rations. Chicks from older breeders showed better performance. In experiment 3, performance and digestibility were not affected by the increasing levels of digestible lysine in diets or egg weights at the moment of hatch.