1. nutrient concentration – nutrient requirement parts of feed : This equation determines the amount of nutrient required in a given quantity of feed, based on the concentration of nutrient in the feed.
2. (parts of feed 1/parts of feed 2) x 100 weight of feed : This equation determines the percentage of feed component 1 in a mixture of two feeds, based on the weight of the feeds.
3. percentage of feed/100 percentage of feed : This equation determines the decimal equivalent of a percentage of feed.