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首页> 外文会议>Proceedings of the 12th International Rapeseed Congress: Abstracts >Effects of xylanase supplementation on digestibility and performance of growing-finishing pigs fed Chinese double-low rapeseed meal inclusion diets: in vitro and in vivo studies
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Effects of xylanase supplementation on digestibility and performance of growing-finishing pigs fed Chinese double-low rapeseed meal inclusion diets: in vitro and in vivo studies

机译：补充木聚糖酶对中低双菜籽粕日粮饲喂日粮的消化率和生长性能的影响

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摘要

An in vitro and a feeding trial were conducted to investigate theeffect of xylanase supplementation on the feeding value of growing-finishing pig diets containing high proportions of Chinese double-low rapeseed meal (DLRM). Seven diets were formulated to meet NRC (1998) nutrient requirements. Diet 1 based on corn and soybean meal was used as positive control 1, and diet 2, a practical diet incorporated with conventional level of Chinese DLRM (6% and 10% of diet for the growing and finishing phase, respectively), as positive control 2. Diet 3 contained higher level of DLRM (10% and 15% of diet for the growing and finishing phase, respectively) as the negative control. Diet 3 plus xylanase at 0.10, 0.25, 0.50 and 0.70 g/kg diet created diets 4, 5, 6and 7, respectively. The seven diets for the growing phase with triplicate each were incubated by the in vitro two-stage incubation method and digestibility of DM, CP and NDF was determined. In vitro, the negative control had a lower CP (P ＜ 0.05) and NDF (P = 0.06) digestibility than positive control 1. Both DM and CP digestibility were increased (P ＜ 0.05) by xylanase supplementation either at 0.50 or 0.70 g/kg diet, and NDF digestibility was improved following any test levels of xylanase addition. There was a high linear correlation (r2 ＞ 0.90, P ＜ 0.05) between the activity of the enzyme when transformed into its logarithmic value and in vitro digestibility of DM, CP or NDF. In the feeding trial, 112 crossbred pigs were randomly assigned to seven dietary treatments with 16 replicate pens of one pig each. Within the inclusion levels of xylanase an obvious dose effect on growth rate was observed (r2 = 0.79, P ＜ 0.05) and xylanase addition at 0.70 g/kg diet resulted in significantly increased ADG over the negative control (878 g/d vs. 828 g/d, P ＜ 0.05) during the growing phase, whereas the similar inclusion effect was not observed during the finishing phase. It would appear that nutritional values of corn and Chinese DLRM diet by pigs could be enhanced and therefore it was feasible to improve dietary inclusion levels of Chinese DLRM by appropriate amount of xylanase addition.
机译：进行了一项体外试验和饲喂试验，研究了木聚糖酶对高比例双低油菜籽粉（DLRM）生长肥育猪日粮饲喂价值的影响。制定了七种饮食以满足NRC（1998）的营养要求。以玉米和豆粕为基础的饮食1为阳性对照1，以常规水平的中国DLRM（分别在生长期和育肥阶段分别为饮食的6％和10％）掺入实用饮食2作为日常饮食的阳性对照。 2.饮食3含有较高水平的DLRM（分别为生长期和育肥阶段的饮食的10％和15％）作为阴性对照。饮食3加上0.10、0.25、0.50和0.70 g / kg饮食的木聚糖酶分别形成了饮食4、5、6和7。通过体外两阶段温育方法温育七份一式三份的生长阶段的日粮，并确定DM，CP和NDF的消化率。在体外，阴性对照的CP（P ＜0.05）和NDF（P = 0.06）的消化率均低于阳性对照1。在0.50或0.70 g / g的条件下添加木聚糖酶可增加DM和CP的消化率（P ＜0.05）。在添加木聚糖酶的任何测试水平下，每公斤饮食和NDF的消化率都得到了改善。转化成对数值的酶活性与DM，CP或NDF的体外消化率之间存在高度线性相关性（r2＞ 0.90，P ＜0.05）。在饲养试验中，将112头杂种猪随机分配到7种日粮处理中，每只猪用16支重复笔。在木聚糖酶的包合水平内，观察到对生长速率有明显的剂量效应（r2 = 0.79，P ＜0.05），以0.70 g / kg的日粮添加木聚糖酶会导致ADG显着高于阴性对照组（878 g / d比828） g / d，P ＜0.05）在生长期，而在收尾阶段未观察到类似的夹杂作用。猪的玉米和中国DLRM日粮的营养价值似乎可以提高，因此通过添加适量的木聚糖酶来提高中国DLRM的日粮包含水平是可行的。

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