Influence of Methane Inhibition on Energetic Efficiency of Lambs

Trei, John Earl; Scott, George C.; Parish, Roger C.

doi:10.2527/jas1972.343510x

Cited by 64 publications

(43 citation statements)

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“…Water concentration was assumed to be 50 M (Kohn and Boston, 2000). It is acknowledged that the upper limit of H 2 pressure in Figure 6 is high for most methanogenesis-inhibition experiments, but similar values have been reported in some in vitro batch culture (Van Nevel et al, 1969; O'Brien et al, 2013) and in vivo (Rufener and Wolin, 1968; Trei et al, 1971, 1972; Kung et al, 2003) experiments where methanogenesis was inhibited.…”

Section: Resultssupporting

confidence: 72%

A theoretical comparison between two ruminal electron sinks

Ungerfeld

2013

Front. Microbiol.

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Dihydrogen accumulation resulting from methanogenesis inhibition in the rumen is an energy loss and can inhibit fermentation. The objective of this analysis was to compare the energetic and nutritional consequences of incorporating H2 into reductive acetogenesis or additional propionate production beyond the acetate to propionate shift occurring along with methanogenesis inhibition. Stoichiometric consequences were calculated for a simulated fermentation example. Possible nutritional consequences are discussed. Incorporating H2 into reductive acetogenesis or additional propionate production resulted in equal heat of combustion output in volatile fatty acids (VFA). Incorporation of H2 into reductive acetogenesis could result in moderate decrease in ruminal pH, although whole-animal buffering mechanisms make pH response difficult to predict. Research would be needed to compare the microbial protein production output. There could be post-absorptive implications due to differences in VFA profile. Electron incorporation into reductive acetogenesis could favor energy partition toward milk, but increase risk of ketosis in high-producing dairy cows on ketogenic diets. Greater propionate production could favor milk protein production, but may be less desirable in animals whose intake is metabolically constrained, like feedlot steers. Because of the different nutritional implications, and because practical solutions to incorporate H2 into either pathway are not yet available, it is recommended to research both alternatives.

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Section: Resultssupporting

confidence: 72%

A theoretical comparison between two ruminal electron sinks

Ungerfeld

2013

Front. Microbiol.

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“…The relatively small amount of emitted hydrogen and the trend for decreasing hydrogen emissions from week 6 to the end of the experiment also suggest possible adaptation and decreased hydrogen production or redirection to alternative hydrogen sinks. It is well known that when halogenated methane analogs and some other halogenated hydrocarbons are administered to ruminants, the increase in hydrogen production is generally of a similar order of magnitude to the decrease in methane production (14,37). The fact that in the current experiment, the increase in the measured emissions of hydrogen was only about 3% of that expected due to the decrease in methane production, suggests that the modes of action of 3NOP may be different to those of the halogenated methane analogs and halogenated hydrocarbons.…”

Section: Discussionmentioning

confidence: 99%

“…Compounds such as bromochloromethane, 2-bromoethane sulfonate, chloroform, and cyclodextrin have been tested, some successfully, in various ruminant species (5). Inhibition of methanogenesis by these compounds in vivo can be up to 60% with the effect of bromochloromethane shown to persist in long-term experiments (5,14). However, the viability of these compounds as mitigation agents has been questioned due to concerns for animal health, food safety, or environmental impact.…”

Section: Significancementioning

confidence: 99%

An inhibitor persistently decreased enteric methane emission from dairy cows with no negative effect on milk production

Hristov

Giallongo

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

362

295

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A quarter of all anthropogenic methane emissions in the United States are from enteric fermentation, primarily from ruminant livestock. This study was undertaken to test the effect of a methane inhibitor, 3-nitrooxypropanol (3NOP), on enteric methane emission in lactating Holstein cows. An experiment was conducted using 48 cows in a randomized block design with a 2-wk covariate period and a 12-wk data collection period. Feed intake, milk production, and fiber digestibility were not affected by the inhibitor. Milk protein and lactose yields were increased by 3NOP. Rumen methane emission was linearly decreased by 3NOP, averaging about 30% lower than the control. Methane emission per unit of feed dry matter intake or per unit of energy-corrected milk were also about 30% less for the 3NOP-treated cows. On average, the body weight gain of 3NOP-treated cows was 80% greater than control cows during the 12-wk experiment. The experiment demonstrated that the methane inhibitor 3NOP, applied at 40 to 80 mg/kg feed dry matter, decreased methane emissions from high-producing dairy cows by 30% and increased body weight gain without negatively affecting feed intake or milk production and composition. The inhibitory effect persisted over 12 wk of treatment, thus offering an effective methane mitigation practice for the livestock industries.

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“…Amichloral (a hemiacetal of chloral and starch) appeared to be safer and increased liveweight gain in sheep [137], but unfortunately its antimethanogenic activity declined with prolonged feeding [21,57]. Similarly the effects of trichloroacetamide and trichloroethyl adipate on ruminal methanogenesis were apparently transient [19,20,138]. The anti-methanogenic activity of bromochloromethane was also reported to be transient [125], however May and colleagues [88,89] suggested that a combination of bromochloromethane and α-cyclodextrin was more stable and capable of suppressing methane emissions in sheep and cattle over a prolonged period.…”

Section: Direct Inhibitionmentioning

confidence: 99%

Methane production by ruminants: its contribution to global warming

Moss

Jouany

Newbold³

2000

Ann. Zootech.

1,120

915

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-The aim of this paper is to review the role of methane in the global warming scenario and to examine the contribution to atmospheric methane made by enteric fermentation, mainly by ruminants. Agricultural emissions of methane in the EU-15 have recently been estimated at 10.2 million tonnes per year and represent the greatest source. Of these, approximately two-thirds come from enteric fermentation and one-third from livestock manure. Fermentation of feeds in the rumen is the largest source of methane from enteric fermentation and this paper considers in detail the reasons for, and the consequences of, the fact that the molar percentage of the different volatile fatty acids produced during fermentation influences the production of methane in the rumen. Acetate and butyrate promote methane production while propionate formation can be considered as a competitive pathway for hydrogen use in the rumen. The many alternative approaches to reducing methane are considered, both in terms of reduction per animal and reduction per unit of animal product. It was concluded that the most promising areas for future research for reducing methanogenesis are the development of new products/delivery systems for anti-methanogenic compounds or alternative electron acceptors in the rumen and reduction in protozoal numbers in the rumen. It is also stressed that the reason ruminants are so important to mankind is that much of the world's biomass is rich in fibre. They can convert this into high quality protein sources (i.e. meat and milk) for human consumption and this will need to be balanced against the concomitant production of methane. methane / ruminants / global warning / reduction strategies Résumé -Production de méthane par les ruminants : sa contribution au réchauffement de la planète. Cet article examine le rôle du méthane dans le processus de réchauffement de la planète et évalue la contribution au méthane atmosphérique des gaz d'origine digestive issus principalement des ruminants. Les émissions annuelles de méthane d'origine agricole dans l'Europe des quinze ont été estimées récemment à 10,2 millions de tonnes et représentent la principale source des entrées Ann. Zootech. 49 (2000) 231-253 231 © INRA, EDP Sciences

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Influence of Methane Inhibition on Energetic Efficiency of Lambs

Cited by 64 publications

References 0 publications

A theoretical comparison between two ruminal electron sinks

A theoretical comparison between two ruminal electron sinks

An inhibitor persistently decreased enteric methane emission from dairy cows with no negative effect on milk production

Methane production by ruminants: its contribution to global warming

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