Feed Conversion Ratio and Average Daily Gain
Two production metrics from a feeding period: average daily gain ADG = (final - initial weight)/days, and feed conversion ratio FCR = total feed / total gain (lb of feed per lb of gain). A steer going 650 to 1,250 lb over 200 days on 3,900 lb of feed gains 3.0 lb/day at a 6.5:1 FCR. Enter feed as-fed (standard); a lower FCR is more efficient, and FCR rises as an animal finishes. A benchmarking aid; the ration, breed, and environment govern.
Formula and source
total_gain = final_weight - initial_weight; ADG = total_gain / days_on_feed; FCR = total_feed / total_gain (lb feed per lb gain).
Standard livestock production metrics (average daily gain, feed conversion ratio) per USDA / land-grant extension animal-science references, by name.
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