Níveis de lisina digestível na fase pré-inicial para pintos de corte provenientes de ovos de diferentes pesos e idades de matrizes
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2011-02-25
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Universidade Federal de Goiás
Resumo
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.
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SANTOS, Januária Silva. Digestible lysine levels in pre-starter rations for broiler chicks hatched from different egg weights and breeder ages. 2011. 82 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2011.