动物营养学报 >

2020 , Vol. 32 >Issue 9: 4462 - 4470

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.09.058

研究简报 SHORT COMMUNICATION

体外产气法和尼龙袋法评价北方7个品种小麦秸秆饲用价值及有效降解率模型预测

  • 程景 ,
  • 张丹丹 ,
  • 李博 ,
  • 靳光 ,
  • 王栋才 ,
  • 徐芳 ,
  • 孙锐锋 ,
  • 梁圆 ,
  • 张元庆
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  • 山西农业大学(山西省农业科学院)动物科学学院, 太原 030032
程景(1988-),女,山西太谷人,助理研究员,硕士,研究方向为反刍动物营养与饲料科学。E-mail:chengjing1104@126.com

收稿日期: 2020-03-05

  网络出版日期: 2020-09-17

基金资助

2019农业农村部政府购买服务项目（16190050-07）；国家重点研发计划（2018YFD0501703）；山西省青年科技研究基金（201801D221309）；山西省现代农业产业技术体系（2017-05）；山西省农业科学院农业科技创新研究课题（YCX2018D2YS03）

收起

Evaluation on Feeding Value of 7 Kinds of Wheat Straws in North by in Vitro Gas Production and Nylon Bag Methods and Prediction Model of Effective Degradation

  • CHENG Jing ,
  • ZHANG Dandan ,
  • LI Bo ,
  • JIN Guang ,
  • WANG Dongcai ,
  • XU Fang ,
  • SUN Ruifeng ,
  • LIANG Yuan ,
  • ZHANG Yuanqing
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  • College of Animal Science, Shanxi Agricultural University(Shanxi Academy of Agricultural Science), Taiyuan 030032, China

Received date: 2020-03-05

  Online published: 2020-09-17

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摘要

本试验旨在通过体外产气法和尼龙袋法对北方7个品种小麦秸秆饲用价值进行评定，并建立有效降解率（ED）预测模型。采用体外产气法测定72 h动态产气量（GP）和发酵参数，并计算产气参数；采用尼龙袋法测定干物质降解率（DMD）、中性洗涤纤维降解率（NDFD）、酸性洗涤纤维降解率（ADFD），计算降解参数。结果表明：1）晋麦90的72 h GP最高，晋麦90的体外干物质消化率（IVDMD）显著高于其他品种（P<0.05）；7种小麦秸秆发酵液氨态氮（NH3-N）含量在23.18~28.57 mg/mL，发酵液pH在6.77~6.97。菏麦0746-2发酵液的乙酸、丙酸、丁酸、总挥发性脂肪酸含量显著高于其他品种（P<0.05），鲁研897发酵液的乙酸/丙酸显著低于其他品种（P<0.05）。2）尼龙袋试验中，晋麦90的DMD、NDFD、ADFD及快速降解部分、慢速降解部分、ED均最高，显著高于其他品种（P<0.05）。3）以IVDMD和GP预测的ED的回归方程为：ED=-18.993+0.306IVDMD+0.660GP（R2=0.884，P=0.013），以DMD预测的ED的回归方程为：ED=4.046+0.552DMD（R2=0.990，P<0.001）。综上所述，与其他6个品种相比，晋麦90的饲用价值相对较高，容易发酵、易于消化，但纤维含量高，在饲粮中添加比例不宜过大。基于ED和IVDMD、GP、DMD的强相关性，建立ED的预测模型，可快速、有效地评价小麦秸秆ED，为其营养价值评定提供参考。

关键词： 小麦秸秆; 饲用价值; 体外产气法; 尼龙袋法; 有效降解率

本文引用格式

程景 , 张丹丹 , 李博 , 靳光 , 王栋才 , 徐芳 , 孙锐锋 , 梁圆 , 张元庆 . 体外产气法和尼龙袋法评价北方7个品种小麦秸秆饲用价值及有效降解率模型预测[J]. 动物营养学报, 2020 , 32(9) : 4462 -4470 . DOI: 10.3969/j.issn.1006-267x.2020.09.058

Abstract

In this experiment, the feeding value of 7 varieties of wheat straws in north were evaluate by in vitro gas production and nylon bag methods, and to build the prediction model of effective degradation (ED). The 72 h dynamic gas production (GP) and fermentation parameters were determined by gas production method, and the gas production parameters were calculated. The dry matter degradation (DMD), neutral detergent fiber degradation (NDFD) and acid detergent fiber degradation (ADFD) were measure using nylon bag method, and the degradation parameters were calculated. The results showed as follows:1) the 72 h GP of Jinmai 90 was the highest, and the in vitro dry matter degradation (IVDMD) of Jinmai 90 was significant higher than that of others varieties (P<0.05). The contents of ammonia nitrogen (NH3-N) in fermentation broth of 7 varieties of wheat straws were 23.18 to 28.57 mg/mL, and the fermentation broth pH were 6.77 to 6.97. The contents of acetic acid, propionic acid, butyric acid and total volatile fatty acid in fermentation broth of Hemai 0746-2 were significantly higher than those of others varieties (P<0.05), and the acetic acid/propionic acid in fermentation broth of Luyan 897 was significantly lower than that of others varieties (P<0.05). 2) In the experiment of nylon bag, the DMD, NDFD, ADFD and rapidly degraded fraction, slowly degraded fraction, ED of Jinmai 90 were the highest, and significantly higher than those of others varieties (P<0.05). 3) The regression equation for ED predicted by IVDMD and GP was:ED=-18.993+0.306IVDMD+0.660GP (R2=0.884,P=0.013), and the regression equation for ED predicted by DMD was:ED=4.046+0.552DMD (R2=0.990,P<0.001). In conclusion, compared with other 6 varieties, Jinmai 90 has high feeding value, and easy to fermentation and digestion, but has high fiber content, which is recommended to be used in small amounts in the diet. Based on the strong correlation between the ED and IVDMD, GP, DMD, the ED of wheat straws can be evaluated quickly and effectively by ED prediction model, which provides a reference for the nutritional value assessment.

Key words： wheat straw; feeding value; in vitro gas production method; nylon bag method; effective degradation

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