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

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

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

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

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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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

Cite this article

CHENG Jing , ZHANG Dandan , LI Bo , JIN Guang , WANG Dongcai , XU Fang , SUN Ruifeng , LIANG Yuan , ZHANG Yuanqing . 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[J]. Chinese Journal of Animal Nutrition, 2020 , 32(9) : 4462 -4470 . DOI: 10.3969/j.issn.1006-267x.2020.09.058

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