Digestible lysine and zinc organic to male broiler 1-11 days: performance and nitrogen balance / Lisina digestível e zinco orgânico para frango de corte macho de 1 aos 11 dias de idade: desempenho e balanço de nitrogênio
AUTOR(ES)
Lilian Bernadete Namazu
DATA DE PUBLICAÇÃO
2006
RESUMO
The present work evaluated the dietary effect of digestible lysine and organic zinc levels to male broiler on growth pre-initial phase (1-11 days old) performance and nitrogen balance (1-7 days old). The broilers were assigned to a completely randomized design with a 5 x 2 factorial arrangement applied in two experiment essays. The main factors were lysine (0.90; 1.00; 1.10; 1.20; and 1.40%) with or without organic zinc, however all diets contained 43 ppm inorganic zinc. The organic zinc were 0 and 252 ppm in carboquelate form. In performance essay the replications were seven and 15 birds for experimental unit. In digestibility essay the replications were six and 6 birds for experimental unit. In both situations the diets contained 2.960 ME/kg and 21% crude protein. In performance study (1 - 11 days old) it was evaluated: weight gain, feed intake, feed: gain ratio, composition and body nutrient depositions. In digestibility essay (1 - 7 days old) carried in batteries, it was evaluated dry matter, crude protein apparent digestibility coefficients and dietary metabolic energy values. From 1 to 7 days old there is not digestible lysine and organic zinc interaction. It was observed quadratic effects (P<0.05) of digestible lysine in final weight, weight gain, relative weight gain and positive linear (P<0.05) effect in feed intake. In both essays the feed: gain ratio did not differ when digestible lysine level and zinc variated in the diet. The weight fast, carcass weight and weight gain variables presented ascendant linear effect (P<0.01) for digestible lysine level. In the carcass chemistry deposition rate the lysine increase coincided with quadratic effect for crude protein (P<0.01) and fat (P<0.07).In the empty body deposition there was quadratic response for digestible lysine level in water (P <0.01), ash (P<0.05) and total empty body deposition (P<0.01). In accordance with the results of the chemical composition and deposition of corporal nutrients, it was estimated 1.25% of digestible lysine from 1 to 11 days old. In the present conditions the optimal level of digestible lysine for male broiler created in concrete floor is 1.19%. From 1 at 7 days old there is not dependence relation between digestible lysine and organic zinc in nitrogen balance. The nitrogen retention had positive linear variation (P<0.05) in response to digestible lysine increase in the diet. This response coincided with linear increase (P<0.05) of weight gain and feed efficiency. In base of nitrogen balance and performance in battery the lisine requirements is equal or bigger that 1.40% for male broiler from 1 at 7 days of age.
ASSUNTO(S)
nutrient depositions zinc zinco deposição de nutrientes nutrição nutrition amino acid aminoácidos requirement
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