These adjustments show that in mass terms (kg of feed/kg of edible meat and associated fat), the recent American feeding efficiency ratios have averaged about 25 for beef (but it must be remembered that most of it is phytomass indigestible by nonruminants), nine for pork and more than three for chicken, implying respective energy conversion efficiencies of less than 4%, nearly 10% and 15%, and protein conversion efficiencies of 4%, 10% and 30%, while about 25 MJ of feed energy are needed to produce a gram of beef protein and the rates are about10 MJ/g for pork and 2.5 MJ/g for chicken (Smil
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