Degradation Characteristics of Unconventional Roughages in Rumen of Dairy Cows

LU Na; ZHANG Caixia; HAN Jiyu; WANG Wei; LI Shengli

doi:10.3969/j.issn.1006-267x.2020.12.027

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 12: 5733 - 5742

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.12.027

Degradation Characteristics of Unconventional Roughages in Rumen of Dairy Cows

LU Na ,
ZHANG Caixia ,
HAN Jiyu ,
WANG Wei ,
LI Shengli

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1. College of Animal Science and Technology, China Agricultural University, State Key Laboratory of Animal Nutrition, Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control, Beijing 100193, China;
2. Inner Mongolia Yili Dairy(Group) Co., Ltd., Hohhot 011500, China

Received date: 2020-05-18

Online published: 2020-12-07

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Abstract

The purpose of this experiment was to evaluate the nutritional value of 5 unconventional roughages (peanut seedlings, barnyard grass, buckwheat straw, protein mulberry silage and wheat silage), and to study the degradation characteristics in rumen of dairy cows. The nylon bag evaluation method was used to evaluate the 72-hour dynamic degradation rate and effective degradability of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF). The results showed as follows: 1) the CP content of protein mulberry silage was the highest, and significantly higher than that of other roughages (P<0.05); the CP content of buckwheat straw was the lowest, and significantly lower than that of other roughages (P<0.05). The NDF and ADF contents of buckwheat straw were significantly higher than those of other roughages (P<0.05). 2) The DM degradation rates at each time point and DM effective degradability of protein mulberry silage were significantly higher than those of other roughages (P<0.05). 3) The CP degradation rates at each time point and CP effective degradability of protein mulberry silage were significantly higher than those of other roughages (P<0.05); the CP degradation rates at each time point of buckwheat straw were the lowest, and significantly lower than that of other roughages (P<0.05). 4) The fraction of immediately degraded of NDF and ADF of 5 roughages had no significant difference (P>0.05), and the fraction of slowly degraded and effective degradability of NDF and ADF of wheat silage were significantly higher than those of other roughages (P<0.05). In summary, the CP protein degradation rate of protein mulberry silage is high, and the nutritional value is high; while the nutritional value of buckwheat straw is relatively poor.

Key words： unconventional roughages; rumen; effective degradability

Cite this article

LU Na , ZHANG Caixia , HAN Jiyu , WANG Wei , LI Shengli . Degradation Characteristics of Unconventional Roughages in Rumen of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2020 , 32(12) : 5733 -5742 . DOI: 10.3969/j.issn.1006-267x.2020.12.027

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