1
|
Tanaka K, Collins S, Polkoff K, Fellner V. Inhibiting methanogenesis by targeting thermodynamics and enzymatic reactions in mixed cultures of rumen microbes in vitro. Front Microbiol 2024; 15:1322207. [PMID: 39206376 PMCID: PMC11349738 DOI: 10.3389/fmicb.2024.1322207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 07/17/2024] [Indexed: 09/04/2024] Open
Abstract
Mitigation of enteric methane (CH4) emissions from ruminant livestock represents an opportunity to improve the sustainability, productivity, and profitability of beef and dairy production. Ruminal methanogenesis can be mitigated via two primary strategies: (1) alternative electron acceptors and (2) enzymatic inhibition of methanogenic pathways. The former utilizes the thermodynamic favorability of certain reactions such as nitrate/nitrite reduction to ammonia (NH3) while the latter targets specific enzymes using structural analogs of CH4 and methanogenic cofactors such as bromochloromethane (BCM). In this study, we investigated the effects of four additives and their combinations on CH4 production by rumen microbes in batch culture. Sodium nitrate (NaNO3), sodium sulfate (Na2SO4), and 3-nitro-1-propionate (3NPA) were included as thermodynamic inhibitors, whereas BCM was included as a enzymatic inhibitor. Individual additives were evaluated at three levels of inclusion in experiments 1 and 2. Highest level of each additive was used to determine the combined effect of NaNO3 + Na2SO4 (NS), NS + 3NPA (NSP), and NSP + BCM (NSPB) in experiments 3 and 4. Experimental diets were high, medium, and low forage diets (HF, MF, and LF, respectively) and consisted of alfalfa hay and a concentrate mix formulated to obtain the following forage to concentrate ratios: 70:30, 50:50, and 30:70, respectively. Diets with additives were placed in fermentation culture bottles and incubated in a water bath (39°C) for 6, 12, or 24h. Microbial DNA was extracted for 16S rRNA and ITS gene amplicon sequencing. In experiments 1 and 2, CH4 concentrations in control cultures decreased in the order of LF, MF, and HF diets, whereas in experiments 3 and 4, CH4 was highest in MF diet followed by HF and LF diets. Culture pH and NH3 in the control decreased in the order of HF, MF, to LF as expected. NaNO3 decreased (p < 0.001) CH4 and butyrate and increased acetate and propionate (p < 0.03 and 0.003, respectively). Cultures receiving NaNO3 had an enrichment of microorganisms capable of nitrate and nitrite reduction. 3NPA also decreased CH4 at 6h with no further decrease at 24 h (p < 0.001). BCM significantly inhibited methanogenesis regardless of inclusion levels as well as in the presence of the thermodynamic inhibitors (p < 0.001) while enriching succinate producers and assimilators as well as propionate producers (p adj < 0.05). However, individual inclusion of BCM decreased total short chain fatty acid (SCFA) concentrations (p < 0.002). Inhibition of methanogenesis with BCM individually and in combination with the other additives increased gaseous H2 concentrations (p < 0.001 individually and 0.028 in combination) while decreasing acetate to propionate ratio (p < 0.001). Only the cultures treated with BCM in combination with other additives significantly (padj < 0.05) decreased the abundance of Methanobrevibacter expressed as log fold change. Overall, the combination of thermodynamic and enzymatic inhibitors presented a promising effect on ruminal fermentation in-vitro, inhibiting methanogenesis while optimizing the other fermentation parameters such as pH, NH3, and SCFAs. Here, we provide a proof of concept that the combination of an electron acceptor and a methane analog may be exploited to improve microbial efficiency via methanogenesis inhibition.
Collapse
Affiliation(s)
- Kairi Tanaka
- Department of Animal Science, North Carolina State University, Raleigh, NC, United States
- Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, United States
| | - Scott Collins
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, United States
| | - Kathryn Polkoff
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, United States
| | - Vivek Fellner
- Department of Animal Science, North Carolina State University, Raleigh, NC, United States
| |
Collapse
|
2
|
Guo W, Wang W, Zhang Y, Zhou M. Effect of 3-Nitropropionic Acid at Different Doses on In Vitro Rumen Fermentation, Digestibility, and Methane Emissions of Grazing Yak and Cattle. Animals (Basel) 2024; 14:1804. [PMID: 38929423 PMCID: PMC11201064 DOI: 10.3390/ani14121804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 06/13/2024] [Accepted: 06/14/2024] [Indexed: 06/28/2024] Open
Abstract
3-nitropropionic acid (3NPA) has been proposed as an useful modifier to mitigate ruminal enteric methane emissions. However, few studies investigated the effects of 3NPA on ruminal fermentation characteristics of grazing ruminants in vitro. Rumen fluid from grazing yak and cattle were collected and incubated with additions of 0, 8, and 16 mM 3NPA. The total gas production, CH4 production, and dry matter digestibility significantly decreased with increasing 3NPA doses in both ruminant species (p < 0.05) and methane production decreased to almost 100% in cattle at 8 mM NPA but not yak, while H2 accumulation showed an opposite trend. The total fatty acid (TVFA) production, acetate concentration, and propionate concentration in cattle decreased as 3NPA doses increased at 12 and 24 h incubation. For yak, the H2 accumulation reached its apex at 8 mM NPA (p < 0.05). The TVFA in yak decreased significantly with increasing 3NPA doses at 12 and 72 h incubation. Moreover, the acetate concentration and propionate concentration in yak decreased as 3NPA doses increased at 12 and 24 h incubation. Overall, these findings demonstrated that 3NPA could be used as a strategy to mitigate methane emissions; although, it negatively affected the dry matter degradability in vitro.
Collapse
Affiliation(s)
- Wei Guo
- Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, Ministry of Education, Guizhou University, Guiyang 550025, China; (W.G.); (W.W.)
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
| | - Weiwei Wang
- Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, Ministry of Education, Guizhou University, Guiyang 550025, China; (W.G.); (W.W.)
| | - Ying Zhang
- School of Public Health, Lanzhou University, Lanzhou 730000, China;
| | - Mi Zhou
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
| |
Collapse
|
3
|
Levent G, Božić A, Petrujkić BT, Callaway TR, Poole TL, Crippen TL, Harvey RB, Ochoa-García P, Corral-Luna A, Yeater KM, Anderson RC. Assessment of Potential Anti-Methanogenic and Antimicrobial Activity of Ethyl Nitroacetate, α-Lipoic Acid, Taurine and L-Cysteinesulfinic Acid In Vitro. Microorganisms 2023; 12:34. [PMID: 38257860 PMCID: PMC10819541 DOI: 10.3390/microorganisms12010034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/30/2023] [Accepted: 12/20/2023] [Indexed: 01/24/2024] Open
Abstract
Livestock producers need new technologies to maintain the optimal health and well-being of their animals while minimizing the risks of propagating and disseminating pathogenic and antimicrobial-resistant bacteria to humans or other animals. Where possible, these interventions should contribute to the efficiency and profitability of animal production to avoid passing costs on to consumers. In this study, we examined the potential of nitroethane, 3-nitro-1-propionate, ethyl nitroacetate, taurine and L-cysteinesulfinic acid to modulate rumen methane production, a digestive inefficiency that results in the loss of up to 12% of the host's dietary energy intake and a major contributor of methane as a greenhouse gas to the atmosphere. The potential for these compounds to inhibit the foodborne pathogens, Escherichia coli O157:H7 and Salmonella Typhimurium DT104, was also tested. The results from the present study revealed that anaerobically grown O157:H7 and DT104 treated with the methanogenic inhibitor, ethyl nitroacetate, at concentrations of 3 and 9 mM had decreased (p < 0.05) mean specific growth rates of O157:H7 (by 22 to 36%) and of DT104 (by 16 to 26%) when compared to controls (0.823 and 0.886 h-1, respectively). The growth rates of O157:H7 and DT104 were decreased (p < 0.05) from controls by 31 to 73% and by 41 to 78% by α-lipoic acid, which we also found to inhibit in vitro rumen methanogenesis up to 66% (p < 0.05). Ethyl nitroacetate was mainly bacteriostatic, whereas 9 mM α-lipoic acid decreased (p < 0.05) maximal optical densities (measured at 600 nm) of O157:H7 and DT104 by 25 and 42% compared to controls (0.448 and 0.451, respectively). In the present study, the other oxidized nitro and organosulfur compounds were neither antimicrobial nor anti-methanogenic.
Collapse
Affiliation(s)
- Gizem Levent
- School of Veterinary Medicine, Texas Tech University, Lubbock, TX 79409, USA;
| | - Aleksandar Božić
- Faculty of Agriculture, Department of Animal Science, University of Novi Sad, 21000 Novi Sad, Serbia;
| | - Branko T. Petrujkić
- Department of Nutrition and Botany, Faculty of Veterinary Medicine, University of Belgrade, 110000 Belgrade, Serbia;
| | - Todd R. Callaway
- Department of Animal and Dairy Science, University of Georgia, Athens, GA 30609, USA;
| | - Toni L. Poole
- United States Department of Agriculture/Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX 77845, USA; (T.L.P.); (T.L.C.); (R.B.H.)
| | - Tawni L. Crippen
- United States Department of Agriculture/Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX 77845, USA; (T.L.P.); (T.L.C.); (R.B.H.)
| | - Roger B. Harvey
- United States Department of Agriculture/Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX 77845, USA; (T.L.P.); (T.L.C.); (R.B.H.)
| | - Pedro Ochoa-García
- Facultad de Zootecnia y Ecología, Universidad Autónoma de Chihuahua, Chihuahua 31000, Mexico; (P.O.-G.); (A.C.-L.)
| | - Agustin Corral-Luna
- Facultad de Zootecnia y Ecología, Universidad Autónoma de Chihuahua, Chihuahua 31000, Mexico; (P.O.-G.); (A.C.-L.)
| | - Kathleen M. Yeater
- United States Department of Agriculture/Agricultural Research Service, Office of the Area Director, 104 Ambrose Hill, Williamsburg, VA 20250, USA
| | - Robin C. Anderson
- United States Department of Agriculture/Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, TX 77845, USA; (T.L.P.); (T.L.C.); (R.B.H.)
| |
Collapse
|
4
|
Arzola-Alavarez C, Castillo-Castillo Y, Anderson RC, Hume ME, Ruiz-Barrera O, Min BR, Arzola-Rubio A, Beier RC, Salinas-Chavira J. Influence of Pine Bark Tannin on Bacterial Pathogens Growth and Nitrogen Compounds on Changes in Composted Poultry Litter. BRAZILIAN JOURNAL OF POULTRY SCIENCE 2020. [DOI: 10.1590/1806-9061-2018-0911] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
5
|
Guo W, Bi S, Kang J, Zhang Y, Long R, Huang X, Shan MN, Anderson RC. Bacterial communities related to 3-nitro-1-propionic acid degradation in the rumen of grazing ruminants in the Qinghai-Tibetan Plateau. Anaerobe 2018; 54:42-54. [PMID: 30081086 DOI: 10.1016/j.anaerobe.2018.07.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Revised: 07/23/2018] [Accepted: 07/31/2018] [Indexed: 12/25/2022]
Abstract
The objectives of this current study were to characterize the overall rumen bacterial community in grazing yak and two sheep species (Tibetan and Small Tail Han sheep) reared in the unique environmental conditions of the Qinghai-Tibetan Plateau, as well as the bacterial community associated with the detoxification of a phytotoxin, 3-nitro-1-propionic acid (NPA), during in vitro culture with 4.2 mM NPA. Using 16S rRNA gene high-throughput sequencing, it was found that the yak rumen harbored populations showing a higher bacterial diversity compared to Tibetan sheep. The rumen bacterial community in the three ruminant species differed from each other. PICRUSt analysis identified that the pathway involved in nitrogen metabolism was enriched in Tibetan sheep while that related to fatty acid biosynthesis was over-represented in the yak. The methane metabolism pathway was dominant in bacterial populations from the Small Tail Han sheep. Comparisons between freshly collected rumen fluid and populations subjected to consecutive 72 h batch cultures revealed substantial decreases in alpha diversity in populations cultured with NPA. Moreover, the relative abundances of some bacterial taxa changed significantly, with increased abundance of Proteobacteria and Actinobacteria. In addition, the overall community structure of the bacterial population in the freshly collected ruminal fluid was clearly different than that within populations observed in the 72 h batch cultures likely due to the impact of NPA treatments and the more restrictive growth conditions of the culture medium. In regard to PICRUSt analysis, the methane metabolism pathway became scarce in Tibetan and Small Tail Han sheep, whereas the energy and carbohydrate metabolic pathways such as nitrogen metabolism, ABC transporters and glycolysis/gluconeogenesis were found to be maintained across all populations. Results from the present study provide new information on the bacterial and functional composition within ruminal populations adapted to three economically important grazing ruminant species prominent on the Qinghai-Tibetan Plateau. The results further reveal that effects of NPA treatment on community structure can have an impact not only the metabolism of NPA but on other digestive functions as well.
Collapse
Affiliation(s)
- Wei Guo
- College of Pastoral Agriculture Science and Technology, State Key Laboratory of Grassland Agro-ecosystems, Lanzhou University, Lanzhou City 730020, China
| | - Sisi Bi
- School of Life Sciences, Lanzhou University, Lanzhou City 730020, China
| | - Jingpeng Kang
- College of Pastoral Agriculture Science and Technology, State Key Laboratory of Grassland Agro-ecosystems, Lanzhou University, Lanzhou City 730020, China
| | - Ying Zhang
- School of Public Health, Lanzhou University, Lanzhou City 730020, China.
| | - Ruijun Long
- College of Pastoral Agriculture Science and Technology, State Key Laboratory of Grassland Agro-ecosystems, Lanzhou University, Lanzhou City 730020, China; School of Life Sciences, Lanzhou University, Lanzhou City 730020, China
| | - Xiaodan Huang
- School of Public Health, Lanzhou University, Lanzhou City 730020, China; Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Qinghai Plateau Yak Research Center, Xining City 810000, China
| | - M N Shan
- School of Life Sciences, Lanzhou University, Lanzhou City 730020, China
| | - Robin C Anderson
- USDA/ARS, Southern Plains Agricultural Research Center, Food and Feed Safety Research Unit, 2881 F&B Road, College Station, TX 77845, USA
| |
Collapse
|