Reading that Wikipedia article I wondered whether it was possible to have an FCR (feed conversion ratio) of less than 1. And indeed it is! https://pdf.usaid.gov/pdf_docs/PA00K8MQ.pdf Of course, the livestock are consuming highly processed, energy rich feed, but so do humans.
OTOH, none of this means that the same amount of net calories are available to the human. FCR is not the same thing as trophic efficiency. In particular, as per the above explanation, FCR is often calculated using wet mass of the output but dry mass of the input.
All that said, the conversion efficiencies for chicken and farmed fish are still amazing.
OTOH, none of this means that the same amount of net calories are available to the human. FCR is not the same thing as trophic efficiency. In particular, as per the above explanation, FCR is often calculated using wet mass of the output but dry mass of the input.
All that said, the conversion efficiencies for chicken and farmed fish are still amazing.