Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of L-glutamine supplementation on degradation rate and rumen fermentation characteristics in vitro

  • Suh, Jung-Keun (Department of Animal Science and Technology, Sanghuh College of Life Sciences, Konkuk University) ;
  • Nejad, Jalil Ghassemi (Department of Animal Science and Technology, Sanghuh College of Life Sciences, Konkuk University) ;
  • Lee, Yoon-Seok (Department of Biotechnology, College of Agriculture and Life Science, Hankyong National University) ;
  • Kong, Hong-Sik (Gyeonggi Regional Research Center, Hankyong National University) ;
  • Lee, Jae-Sung (Department of Animal Science and Technology, Sanghuh College of Life Sciences, Konkuk University) ;
  • Lee, Hong-Gu (Department of Animal Science and Technology, Sanghuh College of Life Sciences, Konkuk University)
  • Received : 2021.06.15
  • Accepted : 2021.09.07
  • Published : 2022.03.01
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Abstract

Objective: Two follow-up studies (exp. 1 and 2) were conducted to determine the effects of L-glutamine (L-Gln) supplementation on degradation and rumen fermentation characteristics in vitro. Methods: First, rumen liquor from three cannulated cows was used to test L-Gln (50 mM) degradation rate and ammonia-N production at 6, 12, 24, 36, and 48 h after incubation (exp. 1). Second, rumen liquor from two cannulated steers was used to assess the effects of five levels of L-Gln including 0% (control), 0.5%, 1%, 2%, and 3% at 0, 3, 6, 12, 24, 36, and 48 h after incubation on fermentation characteristics, gas production, and degradability of nutrients (exp. 2). Results: In exp. 1, L-Gln degradation rate and ammonia-N concentrations increased over time (p<0.001). In exp. 2, pH was reduced significantly as incubation time elapsed (p<0.001). Total gas production tended to increase in all groups as incubation time increased. Acetate and propionate tended to increase by increasing glutamine (Gln) levels, whereas levels of total volatile fatty acids (VFAs) were the highest in 0.5% and 3% Gln groups (p<0.001). The branched-chain VFA showed both linear and quadratic effects showing the lowest values in the 1% Gln group particularly after 6 h incubation (p<0.001). L-Gln increased crude protein degradability (p<0.001), showing the highest degradability in the 0.5% Gln group regardless of incubation time (p<0.05). Degradability of acid detergent fiber and neutral detergent fiber showed a similar pattern showing the highest values in 0.5% Gln group (p<0.10). Conclusion: Although L-Gln showed no toxicity when it was supplemented at high dosages (2% to 3% of DM), 0.5% L-Gln demonstrated the positive effects on main factors including VFAs production in-vitro. The results of this study need to be verified in further in-vivo study.

Keywords

Acknowledgement

This work was supported by Korean Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through (Export Promotion Technology Development Program), funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (grant number 618002-05).

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