Relationship of Rumen Volatile Fatty Acids to Type of Grain, Sorghum Grain Processing Method and Feedlot Performance

1972 ◽  
Vol 35 (2) ◽  
pp. 404-409 ◽  
Author(s):  
Larry G. Franks ◽  
James R. Newsom ◽  
R. E. Renbarger ◽  
Robert Totusek
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Grain Sorghum ◽  
Processing Method ◽  
Feedlot Performance ◽  
Grain Processing ◽  
Sorghum Grain ◽  
Relationship Of

EFFECT OF MONENSIN AND A DEAMINASE INHIBITOR ON FEED UTILIZATION BY LAMBS

1980 ◽  
Vol 60 (1) ◽  
pp. 169-172 ◽  
Author(s):  
G. M. J. HORTON
Keyword(s):  
Fatty Acids ◽  
Propionic Acid ◽  
Feed Efficiency ◽  
Volatile Fatty Acids ◽  
Control Diet ◽  
Animal Health ◽  
Feed Utilization ◽  
Feedlot Performance ◽  
Gain Ratio ◽  
Health Products

Lambs were fed monensin (Rumensin®, monensin sodium, Eli Lilly and Co., Greenfield, Ind.) and a deaminase inhibitor 4,4’-dimethyldiphenyliodonium chloride (SmithKline Animal Health Products, West Chester, Pa.) (DAI) at 33 and 25 mg/kg of diet, respectively. Digestibility and ruminal volatile fatty acids were measured using five yearling lambs per treatment. There were no treatment effects on digestibility. Molar proportions of propionic acid were 93% higher when monensin plus DAI were fed than when lambs were offered the nonmedicated control diet. Feedlot performance was measured using eighty 18-kg crossbred lambs, with two pens of 10 lambs per treatment. Lambs fed DAI consumed 8% less feed than controls, though feed to gain ratio was not affected. Gains and feed efficiency with monensin were 8% and 5% higher (P < 0.05), respectively, than control values, though feed was utilized most efficiently when both monensin and DAI were fed.

scholarly journals Effect of Inoculum Pretreatment on the Composition of Microbial Communities in Anaerobic Digesters Producing Volatile Fatty Acids

2020 ◽  
Vol 8 (4) ◽  
pp. 581 ◽  
Author(s):  
Lucia Blasco ◽  
Minna Kahala ◽  
Elina Tampio ◽  
Markku Vainio ◽  
Satu Ervasti ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Microbial Communities ◽  
Volatile Fatty Acids ◽  
Cost Effective ◽  
Added Value ◽  
Methane Formation ◽  
Anaerobic Digesters ◽  
Formation Pathway ◽  
Fuels And Chemicals ◽  
Relationship Of

Volatile fatty acids (VFAs) are intermediates in the methane formation pathway of anaerobic digestion and can be produced through the fermentation of organic wastes. VFAs have become an anticipated resource- and cost-effective way to replace fossil resources with higher added value and more versatile fuels and chemicals. However, there are still challenges in the production of targeted compounds from diverse and complex biomasses, such as urban biowastes. In this study, the aim was to modulate the microbial communities through inoculum treatment to enhance the production of green chemicals. Thermal and freeze-thaw treatments were applied to the anaerobic digester inoculum to inhibit the growth of methanogens and to enhance the performance of acidogenic and acetogenic bacteria. VFA fermentation after different inoculum treatments was studied in batch scale using urban biowaste as the substrate and the process performance was assessed with chemical and microbial analyses. Inoculum treatments, especially thermal treatment, were shown to increase VFA yields, which were also correlating with the dynamics of the microbial communities and retention times of the test. There was a strong correlation between VFA production and the relative abundances of the microbial orders Clostridiales (families Ruminococcaceae, Lachnospiraceae and Clostridiaceae), and Lactobacillales. A syntrophic relationship of these taxa with members of the Methanobacteriales order was also presumed.

Unravelling a microbial synergy to boost caproate production via carboxylates chain elongation with ethanol

2019 ◽  
Vol 26 (2) ◽  
pp. 63-71
Author(s):  
Ling Leng ◽  
Ying Wang ◽  
Peixian Yang ◽  
Takashi Narihiro ◽  
Masaru Konishi Nobu ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Microbial Consortia ◽  
Chain Elongation ◽  
Desulfovibrio Vulgaris ◽  
Rrna Gene ◽  
Selective Enrichment ◽  
Microbial Network ◽  
Cost Efficient ◽  
Rrna Gene Sequencing

Chain elongation of volatile fatty acids for medium chain fatty acids production (e.g. caproate) is an attractive approach to treat wastewater anaerobically and recover resource simultaneously. Undefined microbial consortia can be tailored to achieve chain elongation process with selective enrichment from anaerobic digestion sludge, which has advantages over pure culture approach for cost-efficient application. Whilst the metabolic pathway of the dominant caproate producer, Clostridium kluyveri, has been annotated, the role of other coexisting abundant microbiomes remained unclear. To this end, an ethanol-acetate fermentation inoculated with fresh digestion sludge at optimal conditions was conducted. Also, physiological study, thermodynamics and 16 S rRNA gene sequencing to elucidate the biological process by linking the system performance and dominant microbiomes were integrated. Results revealed a possible synergistic network in which C. kluyveri and three co-dominant species, Desulfovibrio vulgaris, Fusobacterium varium and Acetoanaerobium sticklandii coexisted. D. vulgaris and A. sticklandii (F. varium) were likely to boost the carboxylates chain elongation by stimulating ethanol oxidation and butyrate production through a syntrophic partnership with hydrogen (H2) serving as an electron messenger. This study unveils a synergistic microbial network to boost caproate production in mixed culture carboxylates chain elongation.

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