Este experimento foi realizado com o objetivo
de estudar o efeito de enzimas carboidrases exógenas
com atividade xilanase sobre a energia metabolizável
aparente (EMA) e aparente corrigida (EMAn) do
farelo de arroz integral (FAI). As enzimas carboidrases
com atividade xilanase utilizadas foram as da marca
comercial Rovabio TM Excel AP, Allzyme Rice e Ronozyme
WX, denominadas, respectivamente, neste trabalho,
de enzimas A, B, e C. Foram utilizadas 240 aves
de corte da linhagem Coob, com 21 dias de idade, alojadas
em gaiolas metálicas com bandejas coletoras de
excretas instaladas em uma sala de metabolismo com
ambiente controlado. O delineamento foi inteiramente
casualizado, constituÃdo por 4 dietas-referência e 4 dietas-
teste e 6 repetições, totalizando 48 parcelas com 5
aves cada uma. As dietas-referência e as dietas-teste estudadas
foram as seguintes: Dieta-referência à base de
milho, farelo de soja, vitaminas e minerais (DR); DR +
enzima A; DR + enzima B; DR + enzima C; 70% de
DR + 30% de FAI; 70% de DR + 30% de FAI + enzima
A; 70% de DR + 30% de FAI + enzima B e 70% de
DR + 30% de FAI + enzima C. Utilizou-se o método de
coleta total de excretas (Sibbald & Slinger, 1963) durante
5 dias em cada unidade experimental, precedido
de 5 dias de adaptação das aves às dietas. As determinações
de EMA e EMAn foram realizadas conforme
metodologia de Matterson et al. (1965). A EMAn do
FAI foi de 2897 kcal/kg de MS. Com o uso das enzimas
carboidrases, o melhor valor de EMAn do FAI foi obtido
quando utilizou-se a enzima C, sendo de 3083
kcal/kg de MS, com um aumento percentual de 6,4%.
A dieta-referência que recebeu a adição da enzima C
teve sua EMAn aumentada, o que não ocorreu com a
utilização das outras carboidrases.
An experiment was conducted to study
the effect of exogen carbohydrase enzymes with
xylanase activity on the apparent metabolizable energy
(AME) and apparent corrected metabolizable energy
(AMEn) of whole rice bran (WRB). The carbohydrase
enzymes with xylanase activity utilized those of
commercial brand Rovabio TM Excel AP, Allzyme Rice
and Ronozyme WX, denominated, respectively, in this
work, of enzymes A, B, and C. A. boret 240 broilers
Cobb strain aged 21 days were housed in metallic cages
with excreta-collecting installed in a metabolism room
with controlled atmosphere. The experimental desing
was completely randomized using 4 reference-diets and
4 test-diets and 6 replicates, amounting 48 plots with 5
birds each. The reference-diets and test-diets studied
were the following: Reference-diet on the basis of corn, soybean meal, vitamins and minerals (RD); RD +
enzyme A; RD + enzyme B; RD + enzyme C; 70% of
RD + 30% of WRB; 70% of RD + 30% of WRB +
enzyme A; 70% of RD + 30% of WRB + enzyme B and
70% of RD + 30% of WRB + enzyme C. The method of
total excreta collection was used (Sibbald & Slinger,
1963) for 5 days in each experimental unit, preceded of
5 days of adaptation of the birds to the diets. The
determinations of AME and AMEn were accomplished
according to the methodology by Matterson et al.
(1965). AMEn of WRB was of 2,897 kcal/kg of DM.
Using the carbohydrase enzymes the best value of
AMEn of WRB was obtained when enzyme C was
added, its being of 3,083 kcal/kg of DM, with a
percent increase of 6.4%. The reference-diet that
received the addition of enzyme C, had its AMEn
increased, which did not happen when the other
carbohydrases was used.
