Ruminal Degradation Characteristics and Small Intestinal Digestibility of Rumen Undegraded Protein of Six Feed Ingredients

ZHAO Liansheng, NIU Junli, XU Yuanjun, WANG Fang, ZHENG Chen, LI Fadi, GUO Jiangpeng, BU Dengpan

doi:10.3969/j.issn.1006-267x.2017.06.025

2017 , Vol. 29 >Issue 6: 2038 - 2046

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.06.025

Molecular Nutrition

Ruminal Degradation Characteristics and Small Intestinal Digestibility of Rumen Undegraded Protein of Six Feed Ingredients

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1. Faculty of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
2. State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
3. Beijing General Station of Animal Husbandry, Beijing 100107, China

Received date: 2016-12-05

Online published: 2017-06-07

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Abstract

This experiment was conducted to determine the ruminal degradation characteristics and small intestinal digestibility of rumen undegraded protein (RUP) of six feed ingredients for dairy cows from Xinjiang, including corn silage, cottonseed hulls, alfalfa meal, alfalfa hay, grape seed meal and tomato sauce residue. Three lactating Holstein cows fitted with permanent rumen fistulas were selected to estimate the ruminal degradation characteristics of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) and small intestinal digestibility and intestinal digestible crude protein (IDCP) content of RUP by nylon-bag technique and modified three-step in vitro method. The results showed as follows:1) DM effective degradability of alfalfa meal and corn silage was higher, which was significantly higher than that of alfalfa hay and tomato sauce residue (P<0.05), and DM effective degradability of grape seed meal and cottonseed hulls was significantly lower than that of the other feed ingredients (P<0.05); CP effective degradability showed tomato sauce residue > alfalfa meal > corn silage > alfalfa hay > cottonseed hulls > grape seed meal with significant differences among feed ingredients (P<0.05); NDF effective degradability showed corn silage > alfalfa meal > cottonseed hulls > alfalfa hay > tomato sauce residue > grape seed meal, and the differences among feed ingredients were significant (P<0.05); ADF effective degradability showed corn silage > cottonseed hulls > alfalfa hay > tomato sauce residue > alfalfa meal > grape seed meal with significant differences among feed ingredients (P<0.05). 2) Small intestinal digestibility and IDCP content of RUP of alfalfa meal were the highest; small intestinal digestibility of alfalfa meal was significantly higher than that of alfalfa hay, corn silage, tomato sauce residue, grape seed meal and cottonseed hulls (P<0.05), which was decreased in order; there was no significant difference of IDCP content of RUP between alfalfa meal and alfalfa hay, which was significantly higher than that of corn silage, tomato sauce residue, grape seed meal and cottonseed hulls (decreased in order) (P<0.05). In conclusion, different feed ingredients have different ruminal degradation characteristics and the efficiency of IDCP production. Effective degradability of DM, NDF and ADF of corn silage is higher, small intestinal digestibility of RUP of corn silage was the highest, and alfalfa meal and alfalfa hay have higher IDCP content.

Key words： feed ingredient; ruminal degradability; small intestinal digestibility of rumen undegraded protein

Cite this article

ZHAO Liansheng, NIU Junli, XU Yuanjun, WANG Fang, ZHENG Chen, LI Fadi, GUO Jiangpeng, BU Dengpan . Ruminal Degradation Characteristics and Small Intestinal Digestibility of Rumen Undegraded Protein of Six Feed Ingredients[J]. Chinese Journal of Animal Nutrition, 2017 , 29(6) : 2038 -2046 . DOI: 10.3969/j.issn.1006-267x.2017.06.025

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