How much solid waste does the average cow produce each day?

I am doing a project on producing electricity from biogas and I need certain information that how much manure(typically, solid waste) is produced by a cow per day, how much biogas can be produced from that much manure, how much do we need to feed cows so that they can give that much waste etc. Any information will... show more I am doing a project on producing electricity from biogas and I need certain information that how much manure(typically, solid waste) is produced by a cow per day, how much biogas can be produced from that much manure, how much do we need to feed cows so that they can give that much waste etc. Any information will be helpful. Please help me out. I only have 2 weeks for my project to be submitted.
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