Ruminant Nutrition

Evaluation of Nutrient Values of Common Roughages for Dairy Cattle in Northern China Using Cornell Net Carbohydrate and Protein System

  • JIN Lingpin ,
  • LI Yanling ,
  • TU Yan ,
  • JIANG Chenggang ,
  • NIE Mingfei ,
  • DIAO Qiyu
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  • 1. Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. Hebei North University, Zhangjiakou 075000, China

Received date: 2012-09-29

  Online published: 2013-02-28

Abstract

The objective of this study was to evaluate the nutrient values of roughages for dairy cattle in northern China using Cornell net carbohydrate and protein system (CNCPS). A total of 33 roughage samples in 3 classes and 7 types were collected from Beijing, Shandong, Henan, Hebei and Inner Mongolia, etc. The basic nutrient contents were analyzed, and the carbohydrate and protein fraction were calculated respectively according to the CNCPS method. The roughage samples were analyzed by category. The results showed that the soluble crude protein in roughage was mainly non-protein nitrogen, and true protein content was relatively less; alfalfa was a kind of high quality roughage with high protein content, low unavailable protein content and high nonstructural carbohydrate content; the nutrient value of wheat straw was low for the high unavailable fiber and protein; the corn silage feed had a higher nutrient value than the straw class feeds for the lower content of unavailable fiber and protein; the nutrient value of waxy maize stalk was higher than that of corn stalk and corn stalk silage feeds for higher crude protein and lower unavailable fiber and unavailable protein. The results indicate that the analytical methods of CNCPS includes more component items of feed samples, and this system can reflect feed utilization better and evaluate nutrient values of feeds more accurately.

Cite this article

JIN Lingpin , LI Yanling , TU Yan , JIANG Chenggang , NIE Mingfei , DIAO Qiyu . Evaluation of Nutrient Values of Common Roughages for Dairy Cattle in Northern China Using Cornell Net Carbohydrate and Protein System[J]. Chinese Journal of Animal Nutrition, 2013 , 25(3) : 512 -526 . DOI: 10.3969/j.issn.1006-267x.2013.03.009

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