Barley Straw: Evaluation of Components in Cornell Net Carbohydrate and Protein System and Prediction of Nutritional Value by Near Infra-Red Spectrum

LI Guozhang, YU Xiaonan, WANG Zhilan, MA Wanhao, DENG Ying, DONG Chunxiao, YAN Baipeng, LAN Guisheng, LI Fei, LI Fadi, WENG Xiuxiu

doi:10.3969/j.issn.1006-267x.2018.03.031

2018 , Vol. 30 >Issue 3: 1063 - 1072

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.03.031

Molecular Nutrition

Barley Straw: Evaluation of Components in Cornell Net Carbohydrate and Protein System and Prediction of Nutritional Value by Near Infra-Red Spectrum

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1. Key Laboratory of Grassland Farming Systems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2. Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, China;
3. Mutton Sheep Breeding Biotechnology Engineering Laboratory of Gansu, Minqin 733300, China

Received date: 2017-08-31

Online published: 2018-03-05

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Abstract

This study aimed at establishing a database of nutritional value of barley straw based on the Cornell net carbohydrate and protein system (CNCPS), and founding nutritional value prediction models with near infra-red spectrum (NIRS). A total of 96 barley straw samples were collected from 13 counties and cities in Gansu province. Contents of dry matter (DM), crude ash (Ash), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), neutral detergent insoluble protein (NDIP), acid detergent insoluble protein (ADIP), soluble protein (SP), calcium (Ca) and phosphorus (P) were determined. Then the carbohydrate (CHO) and protein components were calculated by CNCPS. NIRS models were evaluated using 76 samples and 20 samples as calibration and validation database, respectively. The results showed as follows:1) contents of DM, Ash, CP, EE, NDF, ADF, ADL, NDIP, ADIP, SP, Ca and P of barley straw were 95.21%, 7.38%, 3.51%, 5.68%, 70.95%, 45.16%, 5.17%, 1.02%, 0.57%, 1.65%, 0.71% and 0.09%, respectively. 2) Contents of CHO, non fiber carbohydrates (NFC), soluble fiber (CB2), digestible fiber (CB3) and indigestible fiber (CC) of barley straw of CHO components defined by CNCPS were 83.42%, 12.47%, 12.47%, 58.55% and 12.40%, respectively. Contents of soluble true protein (PA2), insoluble true protein (PB1), fiber conjugated protein (PB2) and undegradable protein (PC) of barley of protein components defined by CNCPS were 1.65%, 1.23%, 0.45% and 0.57%, respectively. 3) Cross validation determinant coefficient (1-VR)>0.8, and the verification decision coefficient (RSQv) ≥ 0.84 for the model parameters of OM, CP, NDF, ADF, CHO, NFC and CB2, which suggested that the models can be used for actual analysis. Model parameters of OM, CP, NDF, ADF, CHO, NFC and CB2 were SNV and detrend 2, 4, 4, 1; SNV and detrend 2, 4, 4, 1; SNV and detrend 1, 4, 4, 1; None 1, 4, 4, 1; SNV and detrend 2, 4, 4, 1; None 2, 4, 4, 1; None 2, 4, 4, 1; respectively. Other models did not reach the practical application level. In conclusion, the study provide chemical analysis data for the application of barley straw in diet for ruminants, and establish models for prediction of main nutrients by NIRS.

Key words： barley straw; Cornell net carbohydrate and protein system; near infra-red spectrum; nutritional value

Cite this article

LI Guozhang, YU Xiaonan, WANG Zhilan, MA Wanhao, DENG Ying, DONG Chunxiao, YAN Baipeng, LAN Guisheng, LI Fei, LI Fadi, WENG Xiuxiu . Barley Straw: Evaluation of Components in Cornell Net Carbohydrate and Protein System and Prediction of Nutritional Value by Near Infra-Red Spectrum[J]. Chinese Journal of Animal Nutrition, 2018 , 30(3) : 1063 -1072 . DOI: 10.3969/j.issn.1006-267x.2018.03.031

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