Desenvolvimento de embriões e pintos de corte provenientes de ovos de diferentes pesos e idades de matriz e níveis de aminoácidos sulfurados na fase póseclosão
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Data
2010-03-01
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Universidade Federal de Goiás
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Aiming to evaluate the effects of broiler breeder´s age and egg weight on the performance, two experiments were conducted using increasing levels of sulfur amino acids. For each experiment, 320 chicks from a commercial hatchery were used. The experimental design was randomized blocks due to the sex of chicks in a 2x4 factorial arrangement. The chicks´ performance was evaluated according to the breeders age and the egg weight combined with high levels of methionine and digestible cystine in the pre-starter ration (0.810, 0.910, 1.010 and 1.110%), in a total of eight experimental groups
and four replicates of 10 birds each, The eggs were separated, weighed and distributed in a stroller in a commercial incubator, with constant temperature at
37.8 ºC and humidity between 60 and 65%. Chicks from old and new breeders and two different egg weights were submitted to necropsy, biometry of the intestinal tract (GIT) organs, and intestinal histomorphometry were performed.
Blood was collected for glucose analysis at 19 days of embryo, and after hatching, at seven and 14 days of life. The rest of the chicks were submitted to a metabolism trial at four and seven days of age, by the method of excreta collection and the nitrogen balance was determined (g). Other autopsies were carried out at seven and 14 days of life with the performance of the same analyses previously described. The broilers performance was not evaluated up to 21 days of life. Data were submitted to analysis of variance and polynomial
regression for the levels of sulfur amino acids according to SAS (2004). A higher initial development was observed in young breeders for both biometry of digestive organs and intestine histomorphometry .This development is more
evident in chicks of older breeders. The differences found in the experiment with different egg weights show a better development of embryos and chicks for eggs weighing 70 g. Chicks from 70-g-eggs and 45-week-old breeders were
heavier. Average levels of 0.910% and 1.010% of methionine + digestible cystine in the pre-starter ration resulted in performance and nutrient retention more suitable for broiler chicks in both experiments. Based on feed conversion, we suggest the minimum recommendation of 0.810%.
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FERREIRA, Lídia Lopes. Development of embryos and broilers obtained from different egg weights and breeder ages and sulphur aminoacids supplementation in post hatch phase. 2010. 67 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2010.