Effect of different enzyme preparations supplemented in a rye-based diet on the performance of young broilers and the viscosity of digesta and cloacal excreta
1998
Zhang Zhiqun | Han Zhengkang(Nanjing Agricultural Uni., Nanjing (China). Lab. of Animal Physiology and Biochemistry)
A feeding experiment involving 180 young broilers was conducted to study the effect of supplementeding four different enzyme preparations, NQ, RM1, RM2 and RM3, in a rye-based diet (54.4) on the performance of chicks, and the viscosity of digesta and cloacal excreta. The enzyme preparation NQ and RM1 which had high xylanase activity (7700 IU/g, 345 IU/g) dramatically improved (P0.01) weight gains (18.4, 16.0) and feed conversion rate (15.4, 14.4). RM2 with relatively low xylanase activity (60IU/g) and feed conversion rate high arabinafuranosidase activity (5.3 IU/g) also produced similar effects, with the improvements (P0.01) in weight gain and feed conversion rate being 10.5 and 11.8, respectively. In contrast, RM3 with very low xylanase (5 IU/g) and relatively high protease (80 iu/g) activities, had no effect on eight gain (P0.05), but improved the feed conversion rate (6.4, P 0.05). The reduction in viscosity of digest and that of cloacal excreta by enzyme treatment bollowed a similar trend to that obtained with weight gains and feed conversion rate. In general, there was a reciprical relationship between the amount of xylase added to the diet and the corresponding viscosity of the digesta. These results demonstrate that an enzyme preparation with high xylanase activity can considerably reduce the viscosity of digesta and excreata, and therefore it can improve the performance of young broilers fed a rye-based deit.
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