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Changing the Proportions of Grass and Grain in feed substrate Impacts the Efficacy of <i>Asparagopsis taxiformis</i>to Inhibit Methane Production <i>in Vitro</i>

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American Journal of Plant Sciences 2021年第12期12卷 1835-1858页

作者： R. D. Kinley S. Tan J. Turnbull S. Askew B. M. Roque Futurefeed Pty Ltd. Townsville Australia Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food Townsville Australia College of Public Health Medical and Veterinary Sciences James Cook University (JCU) Douglas Campus Townsville Australia Advanced Analytical Centre (AAC) James Cook University (JCU) Douglas Campus Townsville Australia University of California Davis Davis USA

Benefits of the red seaweed Asparagopsis taxiformis as an ingredient to manage methane (CH4) emissions from the red meat and dairy industries continue to evolve. Asparagopsis has been demonstrated to eliminate enteric CH4 emissions in vitro and reduce it greater than 80% in animals. Variability in animal studies is suspected to be associated with variable inclusion and proportions of grass and grain in the diet. This in vitro study aimed to elucidate effects of gradient grass to grain proportions in the fermentation using five steps from 100% Rhodes grass (RG) to 100% barley grain (BG). Gradient inclusion of Asparagopsis was in six steps of Control with no inclusion (C), Low (L), Low-Medium (LM), Medium (M), Medium-High (MH), and High (H) levels tested in three fermentation durations (24 h, 48 h, 72 h). There was significant effect of RG/BG and inclusion of Asparagopsis such that CH4 production decreased with increasing Asparagopsis independent of RG/BG;however, there was enhanced reduction at greater proportions of BG. Thus, the level of Asparagopsis required to completely inhibit CH4 production in vitro was decreased with decreasing RG/BG. Increasing the duration of fermentation had greatest effect on CH4 at C, L, and LM levels of Asparagopsis independent of RG/BG, although magnitude of CH4 production was greater for higher proportions of BG for the C and L levels. Digestibility of in vitro substrate increased with fermentation duration and increasing BG;however, there was no change associated with inclusion levels of Asparagopsis. Increases in total volatile fatty acids (tVFA) were observed with increased fermentation duration and concomitant with increasing substrate digestion. Increasing proportions of BG induced increase in tVFA. In contrast, and independent of changes in substr

关键词： Asparagopsis taxiformis Enteric Methane Greenhouse Gas Mitigation feed substrate Rhodes Grass Barley Grain In Vitro

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