›› 2018, Vol. 45 ›› Issue (11): 3033-3042.doi: 10.16431/j.cnki.1671-7236.2018.11.008

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Correlation Analysis Between Predicted Yield of Metabolites of Different Corn by-products and Characteristic Parameters of Molecular Functional Groups Based on NRC Model

SUN Kaijing1, ZHAO Hongbo2, YANG Jinshan1, LIU Yan1, LIU Shuai1, XIN Hangshu1   

  1. 1. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China;
    2. Experimental Internship and Demonstration Center, Northeast Agricultural University, Harbin 150030, China
  • Received:2018-04-16 Online:2018-11-20 Published:2018-11-20

Abstract:

The experiment was aimed to predict the metabolic protein production of different corn by-products based on the NRC-2001 model,and analyze the molecular functional group characteristics of different corn by-products and the correlation between them based on the spectral technique,and establish a regression equation.The nutrient value of dairy cow protein was evaluated by NRC-2001 model,and the spectral data was collected and analyzed by Fourier transform infrared (FTIR) technique.The results showed that the metabolic parameters of different corn by-products with significant differences (P<0.05) predicted by the NRC-2001 model.Among them,the total amount of truly absorbable metabolic protein in the small intestine had the highest value in corn gluten meal,followed by corn germ cake,corn germ,corn gluten feed and corn kernel.There was a similar trend in feed milk value (FMV).In the spectral structure analysis,there were significant differences in the molecular functional group parameters of the feed (P<0.05).There was a correlation between the predicted yield of protein metabolites and the molecular functional group parameters.The regression model established was better.Among them,the value of Amide Ⅰ_CELC in corn kernel was significantly higher than other feeds (P<0.05), the values of Amide Ⅰ_SCHO and Amide Ⅰ_CELC were significantly lower in corn germ (P<0.05), the values of Amide Ⅱ_SCHO and Amide Ⅱ_CELC were significantly lower in corn gluten feed than that others (P<0.05),and the value of Amide Ⅱ_TNSCHO of the corn germ cake was significantly higher than that of other feeds (P<0.05).There was no significant correlation between the contents of MCP,AMCP and Amide Ⅰ_TNSCHO in corn and its by-products (P>0.05).However,there was a significant negative correlation between the characteristic parameters and other spectral molecular functional groups (P<0.05). Amide Ⅰ_TCHO and Amide Ⅱ_SCHO could be used as predictors to estimate ARUP,MP and FMV,with a coefficient of determination of 0.997.In conclusion,there was a relationship between the predicted metabolic parameters of protein and biomolecular spectroscopic features in different corn by-products and the nutritional value of feed could be quickly analyzed and estimated by the Fourier transform infrared spectroscopy.

Key words: corn by-products; NRC-2001 model; FTIR spectroscopic features; correlation

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