Chemical Composition, Energetic Values and Ruminal Degradation Characteristics of Different Portions of Cornstalks Derived from Skin-Pith Separation

ZHOU Tao; YANG Qinlan; ZHANG Tongyu; ZHOU Zhenming; REN Liping; MENG Qingxiang; BAI Yuansheng

doi:10.3969/j.issn.1006-267x.2015.01.039

2015 , Vol. 27 >Issue 1: 320 - 326

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.01.039

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Chemical Composition, Energetic Values and Ruminal Degradation Characteristics of Different Portions of Cornstalks Derived from Skin-Pith Separation

ZHOU Tao ,
YANG Qinlan ,
ZHANG Tongyu ,
ZHOU Zhenming ,
REN Liping ,
MENG Qingxiang ,
BAI Yuansheng

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1. State Key Laboratory of Animal Nutrition, College of Animal Science, China Agricultural University, Beijing 100193, China;
2. Shanxi Ecological Animal Husbandry Station, Taiyuan 030002, China

Received date: 2014-07-01

Online published: 2015-01-10

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Abstract

This study was conducted to using chemical analysis, model prediction and in situ nylon bag methods to compare chemical composition, energetic values and ruminal degradation characteristics of different portions of cornstalks derived from an industry skin-pith separation process in a completely randomized single-factorial design. Through simulation of the industry skins-pith separation process using stem-skins as industry plank materials, the cornstalks were manually separated into five portions: leaves, husks, cob, stem-pith and stem-skins, and the whole-plant cornstalk was used as control. The results showed as follows: 1) among different portions of cornstalk, leaves accounted for the highest proportion (31.02%), followed by stem-skins (29.39%), cob (18.93%), husks (10.87%) and stem-pith (9.69%) in whole-plant. 2) There were significant differences in chemical composition among different portions of cornstalks (P<0.05), stem-pith had the highest contents of soluble sugar (10.7%) and starch (0.67%). Although the contents of ether extract, crude protein and ash were 0.85%, 5.2% and 4.8% in whole-plant cornstalks, respectively, the contents of these three nutrients were very low in stem-skins (0.62%, 2.9% and 0.28%, respectively); the proportion of acid detergent insoluble crude protein to crude protein in stem-skins was the highest, indicating the lowest utilization by ruminal microorganisms; fibrous components of cornstalks were not well distributed in different portions, of which acid detergent fiber and acid detergent lignin were higher in stem-skins and cob than husks, stem-pith and leaves, indicating lower nutritive values of stem-skins and cob than husks, stem-pith and leaves. 3) Although stem-skins and cob had higher contents of gross energy than stem-pith, husks and leaves, the available energy values such as digestible energy, metabolizable energy, and net energy for maintenance, lactation and fattening were the lowest in stem-skins and the highest in husks with medium values for leaves, stem-pith and cob. 4) There were significant differences in the ruminal degradation parameters of dry matter and organic matter (P<0.05); potentially degraded part and effective degradability of dry matter and organic matter were significantly lower for stem-skins and cob than leaves, husks and stem-pith (P<0.05), indicating higher nutritive values of leaves, husks and stem-pith, and lower nutritive values of stem-skins and cob. In conclusion, different portions of cornstalks obtained from the industry skin-pith separation process showed significant differences of nutritive values with lowest values for stem-skins and decreased at an order of husks>stem-pith>leaves>cob.

Key words： skin-pith separation; cornstalks; ruminants; chemical composition; energetic value; ruminal degradation characteristics

Cite this article

ZHOU Tao , YANG Qinlan , ZHANG Tongyu , ZHOU Zhenming , REN Liping , MENG Qingxiang , BAI Yuansheng . Chemical Composition, Energetic Values and Ruminal Degradation Characteristics of Different Portions of Cornstalks Derived from Skin-Pith Separation[J]. Chinese Journal of Animal Nutrition, 2015 , 27(1) : 320 -326 . DOI: 10.3969/j.issn.1006-267x.2015.01.039

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