Níveis de proteína e de lisina digestível em rações de frangas de postura comercial
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Data
2010-03-01
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Universidade Federal de Goiás
Resumo
The development of Brazilian aviculture leads to increasingly higher rates of production and quality, with genetics and management studies. The growing and post-laying phases are decisive for the development and productivity of the adult hen and nutrition studies aim at finding the ideal relation among nutrient offer productivity, cost and sustainability. This study had as objective to determine the relationship between the level of crude protein and supplementation of synthetic amino acid L-lysine-HCl, ensuring perfect development of the pullet, production efficiency of the chicken and reduction of nitrogenous products excretion in the environment. The Dekalb White chicks were acquired at one day of age and subjected to growth phase in a commercial farm. The experiment comprised the period between the 11 th and 19 th weeks of age. The weights of the pullets were determined until the appearance of the first egg (19 weeks) and the data about the egg quality 32 weeks of age. Ration supply and egg production were weekly and daily calculated, respectively. The experimental design was completely randomized in a 2x4 factorial design with the following factors: crude protein levels (14% and 16%) and lysine levels (0.484, 0.584, 0.684 and 0.784 mg / kg diet); with eight treatments and four replications, with 10 birds per plot, totaling 320 birds. For the digestibility trial, 64 birds were housed in the same shed, and divided into four birds per treatment. The study showed interaction for feed intake in the 13 th, 15 th, 17 th, 19 th and 20 th weeks, feed conversion in the 11 th and 15 th weeks, weight gain in the 11 th, 15 th and 17 th weeks and for the relation protein-weight gain in the total period, effect of lysine levels on lysine intake in the 15 th, 16 th, 20 th weeks, total period and the relation between lysine intake and weight gain. There was interaction between the levels on feed intake and lysine intake for the 13th, 17 th and 19 th weeks of energy consumption and the 17 th and 19 th weeks. The study showed effects of lysine levels for weight of the oviduct (%), abdominal fat and intestine weight (g), and a significant interaction for oviduct weight (g), wattle weight, ovary weight, and liver weight. No significant effects for age at first egg, 50% of production and serum biochemical values. There was significant interaction in the 12 th week for produced excreta, ingestion, balance and digestibility of ether extract. In the 14 th week there was interaction for feed intake, dry matter ingestion, nitrogen balance and intake, and ether extract balance and digestibility. The experiment showed interaction protein and lysine in the metabolic trial in the 16 th week for nitrogen excreta, excreta produced, nitrogen balance (g e %) and dry matter digestibility (%) and ether extract digestibility. The different levels of crude protein and lysine affected the production variables but they did not affect the quality parameters of eggs, suggesting that the level of 14% of crude protein and 0.484 mg / kg feed of lysine. satisfactorily meet the requirements of the laying hen without compromising their development and production.
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SANTOS, Bruno Moreira dos. Levels of protein and lysine in diets of commercial laying hens. 2010. 74 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2010.