POULTRY NUTRITION

Determination of Nutrient Value and Metabolizable Energy of Roosters in Cottonseed Meal by Near-Infrared Reflectance Spectroscopy

  • LI Yupeng ,
  • NIAN Fang ,
  • LI Aike ,
  • WANG Weiwei ,
  • LU Hui ,
  • WANG Li
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  • 1. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    2. Academy of State Administration of Grain, Beijing 100037, China;
    3. College of Science, Gansu Agricultural University, Lanzhou 730070, China

Received date: 2016-01-12

  Online published: 2016-07-28

Abstract

This experiment aimed at exploring the possibility of determination of common nutrient contents and metabolizable energy of roosters in cottonseed meal by near-infrared reflectance spectroscopy (NIRS). A total of 76 cottonseed meal samples with different producing areas, years and processing methods were collected from all over China. The common nutrients of samples were analyzed, and apparent metabolizable energy and true metabolizable energy of roosters were measured by strong feeding experiment. All the samples were divided into calibration set (n=56) and external validation set (n=20) randomly. Then NIRS calibration models were established. The results showed that: 1) the variation ranges of common nutrients and metabolizable energy were large among different cottonseed meal samples, and coefficient of variation was ranged from 2.52% to 84.75%. Coefficient of variation for moisture, ether extract, crude fiber, apparent metabolizable energy and true metabolizable energy were exceeded 10%; coefficient of variation for crude protein, ash and gross energy were 9.58%, 9.81% and 2.52%, respectively. 2) The coefficient of determination for calibration, coefficient of determination for cross-validation and coefficient of determination for external validation for moisture, crude protein, ether extract, crude fiber, ash and gross energy were ranged from 0.923 5 to 0.975 8, 0.824 7 to 0.930 3 and 0.879 to 0.896, respectively. While the coefficient of determination for calibration, coefficient of determination for cross-validation and coefficient of determination for external validation of apparent metabolizable energy and true metabolizable energy were 0.969 0 and 0.926 8, 0.917 0 and 0.905 7, 0.911 and 0.892, respectively. It is concluded that calibration equation for common nutrients and metabolism can be used for routine analysis.

Cite this article

LI Yupeng , NIAN Fang , LI Aike , WANG Weiwei , LU Hui , WANG Li . Determination of Nutrient Value and Metabolizable Energy of Roosters in Cottonseed Meal by Near-Infrared Reflectance Spectroscopy[J]. Chinese Journal of Animal Nutrition, 2016 , 28(7) : 2013 -2023 . DOI: 10.3969/j.issn.1006-267x.2016.07.006

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