China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (8): 2809-2819.doi: 10.16431/j.cnki.1671-7236.2021.08.014

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effects of Adding Low-level Condensed Tannins to Different Nitrogen Sources on Rumen Fermentation Characteristics and Degradation Rate of Yanbian Yellow Cattle

CAO Xue1, HUANG Xiaocheng1, WANG Xuanli1, TIAN Yihao1, LI Chengyun1,2,3   

  1. 1. Agricultural College, Yanbian University, Yanji 133002, China;
    2. Innovation Center of Beef Cattle Science and Industry Technology, Yanbian University, Yanji 133002, China;
    3. Engineering Research Center of Ministry of Education for Beef Cattle Science and Technology Innovation in Northeast Cold Region, Yanji 133002, China
  • Received:2020-12-17 Online:2021-08-20 Published:2021-08-19

Abstract: The experiment was aimed to study the effects of adding low-level condensed tannins to different nitrogen sources on rumen fermentation parameters and degradation rate of Yanbian Yellow cattle, so as to screen out the nitrogen sources with the best adding ratio and higher utilization rate of condensed tannins, and to provide scientific basis for condensed tannins to be used as functional additives in ruminant.Four Yanbian Yellow cattle (452.3 kg±27.1 kg) were used to provide rumen fluid.6 kinds of feedstuff without condensed tannin were used as nitrogen sources (soybean meal, cottonseed meal, rapeseed meal, Medicago sativa, red clover and Vicia amoena).Different levels of condensed tannin (0 (control group), 0.1%, 0.5% and 0.9%) were added to each nitrogen source diet.There were 24 groups with 3 replicates in each group.The pH, ammonia nitrogen (NH3-N), volatile fatty acids (VFA), gas production, effective degradation rate of dry matter, crude protein and neutral detergent fiber of Yanbian Yellow cattle in vitro rumen fermentation were determined.The results showed that the pH, NH3-N and VFA of each experimental group changed within the normal range and could meet the normal metabolism of rumen microorganisms.These indexes of forage 0.5% condensed tannin groups (hereinafter referred to as 0.5% group) and cake 0.9% groups were good, and the gas production was lower than their respective control groups.The effective degradation rates of dry matter in soybean meal 0.9% group, rapeseed meal 0.5% group and red clover 0.1% group were slightly lower than their respective control groups (P>0.05).The effective degradation rate of crude protein in cottonseed meal 0.5% group was lower than that in the control group (P<0.05), and the effective degradation rate of crude protein in 3 forage 0.9% groups were lower than that in control group.Except for the red clover 0.1% group, the effective degradation rate of neutral detergent fiber in the other five nitrogen source condensed tannin addition groups were significantly lower than that of the control group (P<0.05).Comprehensively considered, the cake 0.9% groups and forage 0.5% groups were more conducive to optimizing the rumen fermentation environment, which could reduce the degradation rate of crude proteins in the rumen and effectively protect the rumen proteins.Among them, Vicia amoena and cottonseed meal had better effect.

Key words: nitrogen source; condensed tannins; rumen fermentation parameters; degradation rate; Yanbian Yellow cattle

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