Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Evaluating fermentation quality, in vitro digestibility and aerobic stability of a total mixed ration ensiled with different additives on Tibet plateau

  • Dong, Zhihao (Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University) ;
  • Wang, Siran (Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University) ;
  • Zhao, Jie (Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University) ;
  • Li, Junfeng (Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University) ;
  • Liu, Qinhua (Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University) ;
  • Bao, Yuhong (Institute of Grassland Science, Tibet Academy of Agricultural and Animal Husbandry Sciences) ;
  • Shao, Tao (Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University)
  • Received : 2019.12.23
  • Accepted : 2020.03.26
  • Published : 2021.02.01
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Abstract

Objective: To investigate the improvement in utilization efficiency of total mixed ration (TMR) on Tibetan plateau, TMR were ensiled with different additives. Methods: A total of 150 experimental silos were prepared in a completely randomized design to evaluate the six treatments: i) control (without additive), ii) Lactobacillus buchneri (L. buchneri), iii) acetic acid, iv) propionic acid, v) 1,2-propanediol; and vi) 1-propanol. After 90 days of ensiling, silos were opened for fermentation quality and in vitro analysis, and then subjected to an aerobic stability test for 14 days. Results: Treating with L. buchneri, acetic acid, 1,2-propanediol and 1-propanol decreased propionic acid contents and yeast number, whereas increased (p<0.05) pH, acetic acid and ethanol contents in the fermented TMR. Despite increased dry matter (DM) loss in the TMRs treated with 1,2-propanediol and 1-pronanol, additives did not affect (p>0.05) all in vitro parameters including gas production at 24 h (GP24), GP rate constant, potential GP, in vitro DM digestibility and in vitro neutral detergent fibre digestibility. All additives improved the aerobic stability of ensiled TMR to different extents. Specially, aerobic stability of the ensiled TMR were substantially improved by L. buchneri, acetic acid, 1,2-propanediol, and 1-propanol, indicated by stable pH and lactic acid content during the aerobic stability test. Conclusion: L. buchneri, acetic acid, 1,2-propanediol, and 1-propanol had no adverse effect on in vitro digestibility, while ensiling TMR with the additives produced more acetic acid and ethanol, subsequently resulting in improvement of aerobic stability. There is a potential for some fermentation boosting additives to enhance aerobic stability of fermented TMR on Tibetan plateau.

Keywords

References

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