%0 Journal Article
%T Digestibilidade ileal verdadeira da prote¨ªna em frangos de corte sob dietas com diferentes n¨ªveis de prote¨ªna bruta = True ileal protein digestibility in broilers fed diets with different crude protein levels
%A Marson Bruck Warpechowski
%A Alexandre de Mello Kessler
%A Simone Pophal
%A Andr¨¦ Ebert
%J Acta Scientiarum : Animal Sciences
%D 2006
%I 
%X A digestibilidade ileal aparente (DIA-PB) e verdadeira (DIV-PB) da prote¨ªna bruta (PB) foram determinadas em frangos de 39 dias de idade sob 4 dietas ¨¤ base de milho e farelo de soja com n¨ªveis de PB variando entre 19,8 e 23,5% (4 repeti  es de 8 frangos/sexo/dieta). As aves receberam as dietas com 0,25% ¨®xido de cromo em quatrorefei  es di¨¢rias, sendo abatidas entre 2 e 4 horas ap¨®s o in¨ªcio da ¨²ltima refei  o. A perda end¨®gena de PB foi obtida pelo intercepto da regress o linear entre o consumo de alimento e a quantidade de PB colhida no ¨ªleo. A digestibilidade aumentou linearmente com o aumento na PB, com coeficientes de regress o e de varia  o (CV%) menores para DIV-PB (1,8*PB + 36,3; r2=0.97; P<0,02; CV%=2,9) que para DIA-PB (3,3*PB + 0,9; r2=0,99; P<0,01; CV%=3,7). A metodologia foi eficiente para determina  o da DIV-PB em frangos. A DIA-PB superestimou o efeito do n¨ªvel diet¨¦tico de prote¨ªna. Crude protein apparent ileal digestibility (DIA-PB) and true ileal digestibility (DIV-PB) were determined in 39 day old broilers on four corn-soybean meal diets with 19.8 to 23.5% crude protein content (4 replicates of 8 birds/sex/diet). Diets contained 0.25% chromium oxide and were given in four daily meals. Birds were sacrificed between 2 and 4 hours after the start of the last meal. Endogenous protein loss was obtained as the intercept of the linear regression between the feed intake and the protein collected in the ileum. A linearincrease in digestibility with dietary protein level increment was observed. Lower coefficients of variation (CV%) and of regression were observed with DIV-PB (1.8*CP + 36.3; r2=0.97; P<0.02; CV%=2.9) than with DIA-PB (3.3*CP + 0.9; r2=0.99; P<0.01; CV%=3.7). Studiedmethodology was efficient to determine true ileal digestibility in broilers. Apparent ileal digestibility overestimated the effect of dietary crude protein level.
%K aves
%K digestibilidade ileal aparente
%K equil¨ªbrio dinamico do indicador
%K n¨ªvel prot¨¦ico
%K ¨®xido de cromo
%K perda end¨®gena de prote¨ªna
%K poultry
%K apparent ileal digestibility
%K marker steady state
%K protein level
%K chromic oxide
%K endogenous protein losses
%U http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/41/9