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Webster John (2022). Animal Welfare: Understanding Sentient Minds and why it matters. UFAW, Wiley Blackwell
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Compassion in World Farming (CIWF)
Farm Animal Welfare Committee, (FAWC, formerly Farm Animal Welfare Council)
Comparison of conversion of Metabolizable Energy (ME) and Protein from competitive and complementary systems to ME and protein for human consumption.
Emergy Yield Ratio (EYR) = Food/NR (imported food, fuel, labout high = good
hiEnvironmental load ration (ELR) = (NR +F)/R high = bad
Sustainability Index (ESY) =EYR/ELR high = good
Energy yield ratio (EYR)= Food/NR =imported food, fuel, labour : HIgh = good
Enironmental load ratio (ELR)=(NR+F)/R Low = good
Sutainability Index (ESI=EYR/ELR High = good