饲料原料中非纤维性多糖含量和 21 日龄及 42 日龄肉鸡饲粮中添加和不添加复合酶后其回肠和全肠道中非纤维性多糖消化率。

Non-cellulosic polysaccharide content in feed ingredients and ileal and total tract non-cellulosic polysaccharide digestibility in 21- and 42-day-old broilers fed diets with and without added composite enzymes.

机构信息

Department of Poultry Science, Center of Excellence for Poultry Science, University of Arkansas, Fayetteville 72701.

Cobb-Vantress, Siloam Springs 72761, AR.

出版信息

Poult Sci. 2019 Sep 1;98(9):4048-4057. doi: 10.3382/ps/pez079.

DOI:10.3382/ps/pez079

PMID:30968121

Abstract

An initial study profiled non-cellulosic polysaccharide (NCP) levels in feed ingredient samples-corn, soybean meal (SBM), whole soybean, and distillers dried grains with solubles (DDGS). A separate NCP digestibility assay was performed in broilers at day 21 (grower phase) and day 42 (finisher phase) fed corn-soy based diets with and without composite enzymes (phytases, multi-carbohydrases, and proteases). Negative control (NC), NC + composite enzymes (NC+E), and positive control (PC) diets were tested. Negative control and NC + E diets were isocaloric, 3,020 kcal/kg ME at grower phase and 3,026 kcal/kg ME at finisher phase. Positive control diet was formulated to meet the Cobb standard nutrient specifications. Diets, pooled digesta, and excreta samples from all treatment diets were collected from 21- and 42-day-old birds and NCP content analyzed as soluble NCP (S-NCP) and insoluble NCP (I-NCP) fractions. Digestibility coefficient (DC) values were determined for all dietary treatments for both the feeding periods. Results from the ingredient analysis showed NCP levels of ∼7 to 10% in corn samples, ∼8 to 11% in SBM samples, ∼11 to 14% (including pectin level) in whole soybean, and ∼12 to 17% in DDGS samples, suggesting variation (P < 0.05) in NCP levels existed within ingredient samples. Digestibility assays showed that enzyme treated (NC + E) diet improved DC values at day 21 from 6 to 10 units and 6 to 9 units for ileal and total tract collection, respectively, for I-NCP fraction (P < 0.05) compared to DC values for NC or PC diets. The ileal DC values at day 42 were not different between treatment diets (∼0.6) but total tract DC values improved 9 to 11 units for broilers fed NC + E diet compared to NC or PC diets. Higher DC values for S-NCP were observed for all treatments for both feeding periods (∼0.7-ileal and ∼0.8-total tract) compared to DC values for I-NCP. Overall, the use of supplemental enzymes in corn-soy-based diets showed improvement in total NCP digestion.

摘要

一项初步研究分析了饲料成分样本（玉米、豆粕、全大豆和玉米酒糟及其可溶物）中的非纤维性多糖（NCP）水平。在 21 日龄（生长期）和 42 日龄（育肥期）的肉鸡中进行了单独的 NCP 消化率测定，这些肉鸡喂食的是含或不含复合酶（植酸酶、多聚糖酶和蛋白酶）的玉米-豆粕基础日粮。测试了阴性对照（NC）、NC+复合酶（NC+E）和阳性对照（PC）日粮。NC 和 NC+E 日粮的能量值相等，生长期为 3020kcal/kg 代谢能，育肥期为 3026kcal/kg 代谢能。阳性对照日粮是根据考伯标准营养规格配制的。收集了所有处理日粮 21 日龄和 42 日龄的鸡的日粮、混合消化物和排泄物样本，并分析了 NCP 含量，分为可溶性 NCP（S-NCP）和不溶性 NCP（I-NCP）。在两个饲养阶段都确定了所有日粮处理的消化系数（DC）值。成分分析结果显示，玉米样本中的 NCP 含量约为 7-10%，豆粕样本中的 NCP 含量约为 8-11%，全大豆中的 NCP 含量约为 11-14%（包括果胶含量），DDGS 样本中的 NCP 含量约为 12-17%，表明成分样本中的 NCP 水平存在差异（P<0.05）。消化率测定表明，与 NC 或 PC 日粮相比，酶处理（NC+E）日粮在第 21 天分别提高了回肠和全肠道收集的 I-NCP 分数的 DC 值 6-10 个单位和 6-9 个单位（P<0.05）。第 42 天，处理日粮之间的回肠 DC 值没有差异（约 0.6），但与 NC 或 PC 日粮相比，喂食 NC+E 日粮的肉鸡的全肠道 DC 值提高了 9-11 个单位。两个饲养阶段，所有处理的 S-NCP 的 DC 值都较高（回肠约为 0.7，全肠道约为 0.8），高于 I-NCP 的 DC 值。总的来说，在玉米-豆粕日粮中添加补充酶可提高总 NCP 的消化率。