Influence of Ethanol on Rumen Fermentation and Nitrogen Metabolism1

Chalupa, William; Evans, J. L.; Stillions, M. C.

doi:10.2527/jas1964.233802x

Cited by 30 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The effects of adding ethanol to rumen cultures was dosedepending, and a decrease in cellulose digestibility occurred with the highest dose (Chalupa et al, 1964), whereas no effects on total VFA concentration was found in another in vitro experiment (Pradhan and Hemken, 1970). Emery et al (1959) found a tendency to decrease OM and N digestibility when feeding ethanol to sheep.…”

Section: Effects Of Dihydrogen Accumulation On the Rates Of Fermentatmentioning

confidence: 90%

Metabolic Hydrogen Flows in Rumen Fermentation: Principles and Possibilities of Interventions

2020

View full text Add to dashboard Cite

Rumen fermentation affects ruminants productivity and the environmental impact of ruminant production. The release to the atmosphere of methane produced in the rumen is a loss of energy and a cause of climate change, and the profile of volatile fatty acids produced in the rumen affects the post-absorptive metabolism of the host animal. Rumen fermentation is shaped by intracellular and intercellular flows of metabolic hydrogen centered on the production, interspecies transfer, and incorporation of dihydrogen into competing pathways. Factors that affect the growth of methanogens and the rate of feed fermentation impact dihydrogen concentration in the rumen, which in turn controls the balance between pathways that produce and incorporate metabolic hydrogen, determining methane production and the profile of volatile fatty acids. A basic kinetic model of competition for dihydrogen is presented, and possibilities for intervention to redirect metabolic hydrogen from methanogenesis toward alternative useful electron sinks are discussed. The flows of metabolic hydrogen toward nutritionally beneficial sinks could be enhanced by adding to the rumen fermentation electron acceptors or direct fed microbials. It is proposed to screen hydrogenotrophs for dihydrogen thresholds and affinities, as well as identifying and studying microorganisms that produce and utilize intercellular electron carriers other than dihydrogen. These approaches can allow identifying potential microbial additives to compete with methanogens for metabolic hydrogen. The combination of adequate microbial additives or electron acceptors with inhibitors of methanogenesis can be effective approaches to decrease methane production and simultaneously redirect metabolic hydrogen toward end products of fermentation with a nutritional value for the host animal. The design of strategies to redirect metabolic hydrogen from methane to other sinks should be based on knowledge of the physicochemical control of rumen fermentation pathways. The application of new -omics techniques together with classical biochemistry methods and mechanistic modeling can lead to exciting developments in the understanding and manipulation of the flows of metabolic hydrogen in rumen fermentation.

show abstract

Section: Effects Of Dihydrogen Accumulation On the Rates Of Fermentatmentioning

confidence: 90%

Metabolic Hydrogen Flows in Rumen Fermentation: Principles and Possibilities of Interventions

2020

View full text Add to dashboard Cite

show abstract

“…Ethanol in ruminant feeding has not proven to be a stimulator of intake (reviewed by Chalupa et al, 1964). Therefore the positive correlation between the concentration of ethanol and SDMI is most probably an associative effect, due to the negative correlation between the concentration of ethanol and ammonia-N (Table 3).…”

Section: Linear Relationships Between Animal and Feed Characteristicsmentioning

confidence: 95%

Voluntary intake of silages in dairy cows depending on chemical composition and in vitro gas production characteristics

et al. 2007

View full text Add to dashboard Cite

“…Ethanol is also related to the organoleptic quality of milk (Gordon and Morgan, 1972; Randby et al. , 1999), changes in ruminal fermentation with increases in ruminal acetate and caproate concentrations (Chalupa et al. , 1964; Durix et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of an indigenous and a commercial Lactobacillus buchneri strain on quality of sugar cane silage

Ávila¹,

Pinto²,

Figueiredo³

et al. 2009

Grass and Forage Science

View full text Add to dashboard Cite

The aim was to evaluate the effects of adding a novel Lactobacillus buchneri strain and a commercial inoculant on the fermentation and aerobic stability of sugar cane silages (Saccharum spp.). In the first experiment samples were collected from sugar cane silage at 5, 20, 40 and 80 d after ensilage in experimental silos and microorganisms belonging to the Lactobacillus genus were isolated and identified, with a wild strain of L. buchneri, UFLA SIL 72, being selected as an inoculant. In the second experiment sugar cane was inoculated with either the novel bacteria or a commercial inoculant at the moment of ensiling and compared with a control silage prepared without an inoculant. Experimental silos were opened at 0, 3, 10, 30, 60 and 90 d of ensilage and their chemical composition measured. The silages opened after 90 d were also assessed for aerobic stability. The addition of L. buchneri resulted in a higher concentration of acetic acid and reduced populations of yeasts in silage compared to the other silage treatments, and a lower ethanol concentration in the silage. The novel L. buchneri isolate and the commercial inoculant also improved aerobic stability of the sugar cane silages. It was concluded that the addition of the novel inoculants L. buchneri UFLA SIL 72 to sugar cane silage can be recommended.

show abstract

Influence of Ethanol on Rumen Fermentation and Nitrogen Metabolism1

Cited by 30 publications

References 0 publications

Metabolic Hydrogen Flows in Rumen Fermentation: Principles and Possibilities of Interventions

Metabolic Hydrogen Flows in Rumen Fermentation: Principles and Possibilities of Interventions

Voluntary intake of silages in dairy cows depending on chemical composition and in vitro gas production characteristics

Effects of an indigenous and a commercial Lactobacillus buchneri strain on quality of sugar cane silage

Contact Info

Product

Resources

About