Most cattle producers are familiar with the term "feed conversion." It is simply the amount of feed an animal consumes as compared to the amount of body weight gained, expressed as a ratio. Feed conversion ratios in the neighborhood of 6:1 (6 lbs of feed per pound of gain) are common in modern beef cattle feedlots. Stocker cattle producers are also interested in feed conversion, but the calculation is a little different. When feeding stockers that are grazing forage, we are most interested in "supplement conversion," which is the amount of supplement fed compared to the amount of additional gain the cattle exhibit. This additional gain is over and above what the cattle would gain from the forage alone, without the supplement. Supplement conversion is hard for a producer to measure, because they usually don't have a control group of non-supplemented animals.

Stocker producers typically must rely on research experiments to help them estimate supplement conversion in different situations. There are a multitude of variables that can affect supplement conversion, making it difficult to confidently predict. Furthermore, there is limited research information available concerning the conversion of byproducts in these different situations. For this reason, the Noble Foundation has begun to conduct a few experiments to address this.

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