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Feed conversion ratio

In animal husbandry, feed conversion ratio (FCR), feed conversion rate, or feed conversion efficiency (FCE), is a measure of an animal's efficiency in converting feed mass into increased body mass.
Specifically FCR is the mass of the food eaten divided by the body mass gain, all over a specified period of time. FCR is dimensionless, i.e. there are no measurement unit associated with FCR.
Animals that have a low FCR are considered efficient users of feed. Poultry usually can convert 2-3 kg of feed into 1 kg of live weight, while sheep and cattle need more than 8 kg of feed to put on 1 kg of live weight. Farm raised Atlantic salmon have a very good FCR, about 1.2.

Reference

Brown, L., Hindmarsh, R., Mcgregor, R., 2001. Dynamic Agriculture Book Three (2nd ed.). McGraw-Hill Book Company, Sydney.