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ScienceDaily_2014 12018.txt

#Camels emit less methane than cows or sheepwhen digesting ruminants exhale methane. Their contribution to this global greenhouse gas is considerable. So far the assumption had been that camels with similar digestion produce the same amount of the climate-damaging gas. However researchers at the University of Zurich and ETH Zurich have shown now camels release less methane than ruminants. Ruminant cows and sheep account for a major proportion of the methane produced around the world. Currently around 20 percent of global methane emissions stem from ruminants. In the atmosphere methane contributes to the greenhouse effect--that's why researchers are looking for ways of reducing methane production by ruminants. Comparatively little is known about the methane production of other animal species --but one thing seems to be clear: Ruminants produce more of the gas per amount of converted feed than other herbivores. The only other animal group that regularly ruminates like ruminants are camels. This includes alpacas llamas dromedaries and Bactrian camels. They too have chambered multi forestomachs. They too regurgitate food from the forestomach in order to reduce it in size through renewed chewing. That's why people assumed up to now that camels produce a similar amount of methane to ruminants. Researchers at the University of Zurich and ETH Zurich have examined now this assumption in a project sponsored by The swiss National Science Foundation and have come to the following conclusion: in absolute terms camels release less methane than cows and sheep of comparable body size. However if one compares methane production with the amount of converted feed then it is the same in both groups. To calculate the proportion of methane produced different estimated values should be used for camels than those used for ruminants explains Marcus Clauss from the Vetsuisse Faculty of the University of Zurich. Lower metabolism--less feed--less methanethe modified calculation of the methane budget may be important for those countries with lots of camels--like the dromedaries in the middle East and in Australia or the alpacas and llamas in various South american countries. In cooperation with Zurich Zoo and private camel keepers scientists from the University of Zurich and ETH Zurich have measured methane production in three types of camelids. The results show us that camels have a lower metabolism. Hence they need less feed and release less methane than our domestic ruminants says the vet Marcus Clauss. The lower metabolism of camels could explain why they thrive particularly in areas with a shortage of food--desert and barren mountain regions. Story Source: The above story is provided based on materials by University of Zurich. Note: Materials may be edited for content and length. Journal Reference e

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