Lisina digestível e zinco quelato para frango de corte macho na fase dos 22 aos 42 dias de idade / Digestible lysine and zinc chelate for male broilers from 22 to 42 days of age

AUTOR(ES)

Estela Kobashigawa

DATA DE PUBLICAÇÃO

2006

RESUMO

In order to evaluate the different levels of digestible lysine and zinc chelate effect on Ross male broiler chicken from 22 to 42 days of age, two trials were carried out. The experimental design was completely randomized with a 5x2 arrangement, with treatments consisting of five levels of lysine and two levels of zinc chelate (43 and 243ppm). All diets contained 3,150 kcal of ME/kg and 19% of crude protein. In trial I, a 30 poultry pen was considered one experimental unit and three pens received the following lysine levels: 0.841, 0.874, 0.995, 1.019 and 1.028%. Average weight at pen was 957.38g. For this trial, parameters evaluated were: performance traits, cut yield and body composition. In trial II, each three birds cage, weighting 866.22g in average, was considered one experimental unit. Birds were fed in repetition another five lysine levels: 0.779, 0.825, 0.961, 1.066 and 1.222%. In this latter trial, data on nitrogen-balance and diets digestibility were determined. Interaction between lysine and zinc chelate was observed for weight at day 42, weight gain, feed:ration gain, dry matter intake, nitrogen intake, crude energy intake, crude energy excreted and energy balance. There was an increasing in breast, thigh and drumstick percentage concomitant with the increase of lysine levels on diet, following a linear equation. The most effective lysine level, accordingly to performance traits, was 1.06% of total lysine, or 0.93% of digestive lysine, when the zinc chelate level was 43ppm. A 253ppm diets required lysine levels of 1.028% or greater.

ASSUNTO(S)

balanço de nitrogênio composição corporal body composition lipid and protein deposition nittrogen balance cut yield rendimento performance deposição lipídeo e proteína desempenho

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