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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0972    [Accepted] Published online April 12, 2020.
Evaluating fermentation quality, in vitro digestibility and aerobic stability of a total mixed ration ensiled with different additives on Tibet plateau
Zhi hao Dong1  , Siran Wang1  , Jie Zhao1  , Junfeng Li1  , Qinhua Liu1, Tao Shao1,* 
Institute of Ensiling and Processing of Grass, College of Agro-grassland Science, Nanjing Agricultural University, Nanjing 210095, China
Correspondence:  Tao Shao,Email: taoshaolan@163.com
Received: 23 December 2019   • Revised: 28 January 2020   • Accepted: 26 March 2020
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) L. buchneri (B); (iii) acetic acid; (A); (iv) propionic acid, (P); (v) 1,2-propanediol, (E); and (vi) 1-propanol, (F). 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 dry matter digestibility (IVDMD) and in vitro neutral detergent fibre digestibility (IVNDFD). 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: Additive; Aerobic Stability; Fermentation Quality; Ensiled Total Mixed Ration; Tibet Plateau


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