Evaluation of Nutritional Value of Roughage Lipids by Using Cornell Net Carbohydrate-Protein System

LI Zhenzhen; HA Si; LIU Qinghua; HOU Yufang

doi:10.3969/j.issn.1006-267x.2019.12.053

Chinese Journal of Animal Nutrition >

2019 , Vol. 31 >Issue 12: 5873 - 5880

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.12.053

Evaluation of Nutritional Value of Roughage Lipids by Using Cornell Net Carbohydrate-Protein System

LI Zhenzhen ,
HA Si ,
LIU Qinghua ,
HOU Yufang

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College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China

Received date: 2019-05-15

Online published: 2019-12-13

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Abstract

The objective of this study was to systematically evaluate the nutritional value of roughage lipids. The ether extract (EE) and fatty acid contents of 10 samples including corn straw, sweet potato vine, peanut vine, soybean seedling and watermelon seedling were determined. The Cornell net carbohydrate-protein system (CNCPS 6.5) was applied to dissect lipid composition, and evaluate the intestinal digestibility of total fatty acid (TFA) and EE. The results showed as follows:1) the range of variation of roughage EE contents were 8.42 to 28.04 g/kg DM, the range of variation of TFA contents were 1.84 to 15.39 g/kg DM, and the range of variation of pigment contents were 3.47 to 21.96 g/kg DM; EE and pigment contents of soybean seedling and TFA content of corn straw were significantly higher than those of other roughages, respectively (P<0.05). 2) The medium chain fatty acids (MCFA) of sweet potato stems and sweet potato leaf accounted for 34.40% and 18.00% of TFA, respectively. It was significantly higher than that of other roughages (P<0.05). The long chain fatty acids (LCFA) of other roughages accounted for 94.68% to 100.00% of TFA, but there were no significant difference (P>0.05). 3) Linoleic acid (LA) content of corn stems was significantly higher than that of corn leaves (P<0.05), but there was no significant difference between sweet potato stems and leaves (P>0.05). Linolenic acid contents of leaves of sweet potato and corn were higher than those of stems. 4) The range of variation of small intestine digestibility of roughage TFA and EE were 76.85% to 85.15% and 13.92% to 59.64%, respectively. The small intestine digestibility of corn stalk EE and sweet potato stalk TFA were significantly higher than those of other roughages (P<0.05). The results show that the pigment content of roughage lipid is high and the fatty acid content is low, resulting in low intestinal digestibility of EE.

Key words： roughage; lipid; fatty acid; pigment; ruminant; digestibility of small intestine

Cite this article

LI Zhenzhen , HA Si , LIU Qinghua , HOU Yufang . Evaluation of Nutritional Value of Roughage Lipids by Using Cornell Net Carbohydrate-Protein System[J]. Chinese Journal of Animal Nutrition, 2019 , 31(12) : 5873 -5880 . DOI: 10.3969/j.issn.1006-267x.2019.12.053

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