EXPERIMENTAL METHOD AND ANIMAL

Nutritional Value of Industrial Hemp By-Product Evaluated by Cornell Net Carbohydrate and Protein System and Nylon Bag Method

  • WANG Yiqiang ,
  • LYU Jingyi ,
  • CHENG Chuanteng ,
  • ZHOU Shuang ,
  • LI Yang ,
  • ZHANG Yonggen
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  • College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China

Received date: 2021-04-09

  Online published: 2021-11-10

Supported by

 

Abstract

This experiment was conducted to compare the nutritional value of industrial hemp by-product, corn straw and alfalfa hay by using Cornell net carbohydrate and protein system (CNCPS), nylon bag method and improved three-step in vitro method. The contents of various nutrients and protein and carbohydrate components of the three feeds (industrial hemp by-product, corn straw and alfalfa hay) were analyzed by CNCPS method; at the same time, the nylon bag method was used to determine the rumen degradation parameters of the dry matter, crude protein, and neutral detergent fiber of the three feeds; then the improved three-step in vitro method was used to evaluate the intestinal digestibility of dry matter and rumen bypass protein. The results showed as follows:1) the nutritional components of the three feeds were very different. The ash, crude protein, fat, neutral detergent insoluble protein and acid detergent insoluble protein contents of industrial hemp by-product were significantly higher than those of corn straw and alfalfa hay (P<0.05), the contents of neutral detergent fiber, acid detergent fiber and starch of industrial hemp by-product were significantly lower than those of corn straw and alfalfa hay (P<0.05); the contents of non-protein nitrogen and soluble protein of industrial hemp by-product were significantly lower than those of alfalfa hay but higher than corn straw (P<0.05). 2) The contents of non-protein nitrogen, fast-degrading protein and medium-rate degrading protein of industrial hemp by-product were significantly lower than alfalfa hay but higher than corn straw (P<0.05), and its slow-degrading protein content was significantly higher than the others (P<0.05), the fast-degradable carbohydrate content of industrial hemp by-product was significantly higher than that of corn straw and alfalfa hay (P<0.05). 3) The effective degradation rates of dry matter and neutral detergent fiber of industrial hemp by-product were significantly lower than those of alfalfa hay but higher than corn straw (P<0.05). The rumen non-degradable protein of industrial hemp by-product was significantly higher than that of the others (P<0.05). 4) The intestinal digestibility of dry matter and protein of industrial hemp by-product was significantly higher than that of corn straw and alfalfa hay (P<0.05). In summary, the whole plant of industrial hemp by-product has higher nutritional value, can provide ruminant animals with rich and excellent protein and fiber, and can be used as a high-quality feed resource for ruminants.

Cite this article

WANG Yiqiang , LYU Jingyi , CHENG Chuanteng , ZHOU Shuang , LI Yang , ZHANG Yonggen . Nutritional Value of Industrial Hemp By-Product Evaluated by Cornell Net Carbohydrate and Protein System and Nylon Bag Method[J]. Chinese Journal of Animal Nutrition, 2021 , 33(11) : 6474 -6482 . DOI: 10.3969/j.issn.1006-267x.2021.11.046

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