RESEARCH PAPER

Comparative Study on Rumen Degradation Rates and Small Intestinal Digestibilities of Nutrients of Different Residue Feeds of Dairy Cows

  • WANG Jinglin ,
  • WEI Yuanhao ,
  • ZHAO Guoqi
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  • 1. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China;
    2. Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou 225009, China;
    3. Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou 225009, China

Received date: 2021-08-12

  Online published: 2022-03-14

Abstract

The purpose of this experiment was to compare the rumen degradation rates and small intestinal digestibilities of nutrients of different residue feeds (corn distiller's grains, sorghum distiller's grains, vinegar less, sugar grains and beer grains). Three Chinese Holstein cows with permanent rumen fistula were selected, and using the nylon bag method to determine the rumen degradation rates and small intestinal digestibilities of dry matter (DM), crude protein (CP), essential amino acids (EAA), neutral detergent fiber (NDF) and acid detergent fiber (ADF) at different time points. The results showed as follows:1) the content of CP in corn distiller's grains, beer grains and sugar grains was significantly higher than that in sorghum distiller's grains and vinegar less (P<0.05), the contents of NDF and ADF of vinegar lees were significantly higher than those in other four kinds of residue feeds (P<0.05), the content of methionine (Met) in corn distiller's grains was significantly higher than that in other four kinds of residue feeds (P<0.05), and the content of lysine (Lys) in corn distiller's grains and sugar grains was significantly higher than that in the other three kinds of residue feeds (P<0.05). 2) The DM effective degradation rate of corn distiller's grains, beer grains and sugar grains was significantly higher than that of the other two kinds of residue feeds (P<0.05); the CP effective degradation rate of corn distiller's grains and sugar grains was significantly higher than that of the other three kinds of residue feeds (P<0.05); the Met rumen degradation rate of beer grains was significantly higher than that of sorghum distiller's grains and vinegar less (P<0.05); the effective degradation rates of NDF and ADF of vinegar lees were the highest, and the NDF effective degradation rate was significantly higher than that of sorghum distiller's grains and sugar grains (P<0.05); the effective degradation rates of NDF and ADF of sugar grains were the lowest, and the ADF effective degradation rate was significantly lower than that of other four kinds of residue feeds (P<0.05). 3) There was no significant difference in the small intestinal digestibility of rumen bypass CP of corn distiller's grains, sugar grains and beer grains (P>0.05), but it was higher than the other two kinds of residue feeds. There was no significant difference in small intestinal digestibility of Met and Lys of corn distiller's grains, sugar grains and beer grains (P>0.05), but the Lys small intestinal digestibility was significantly higher than that of sorghum distiller's grains and vinegar lees (P<0.05), and the Met small intestinal digestibility was significantly higher than that of sorghum distiller's grains (P<0.05). In conclusion, the sugar grains, beer grains have similar rumen degradation rates and small intestinal digestibilities with corn distiller's grains, which can replace corn distiller's grains as residue protein feeds to a certain extent.

Cite this article

WANG Jinglin , WEI Yuanhao , ZHAO Guoqi . Comparative Study on Rumen Degradation Rates and Small Intestinal Digestibilities of Nutrients of Different Residue Feeds of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2022 , 34(3) : 1592 -1603 . DOI: 10.3969/j.issn.1006-267x.2022.03.022

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