How much methane is produced from the manure of one cow in one day?

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    Depends on the specific breed of cattle since there are over 800 breeds recognized worldwide.  According to a 2007 study from Cornell University, the average dairy cattle in the United States produces 580 liters of methane every day!  In 1944, that amount was 332 liters a day, which is a whopping 175% increase.  Since milk production is likely to increase per individual cattle in the United States if no action is taken, expect larger unhappier cows, producing individually more milk and more methane, while consuming a larger proportion of water than other species of fauna.

    If the trend is not stopped, cows in the U.S. might look like this in the future:

    http://www.gijar.com/wp-content/uploads/2012/04/dff23rcow.jpg

    source for image: http://www.gijar.com

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