A lactating cow can produce more than (60 mathrm{~kg}) of manure (about (7 mathrm{MJ} / mathrm{kg}) on

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A lactating cow can produce more than \(60 \mathrm{~kg}\) of manure (about \(7 \mathrm{MJ} / \mathrm{kg}\) on a dry basis) per day. What is the energy efficiency of converting cow manure to biogas if it yields \(25 \mathrm{~m}^{3}\) per \(\mathrm{Mg}\) with the methane content of \(55 \%\left(35 \mathrm{MJ} / \mathrm{m}^{3}\right)\) ?

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