Not a cull decision — a timing one. Put in what they are worth today, what you think they will be worth later, and what it costs to get them there. The arithmetic is the same one your extension office teaches; this just does it with your numbers instead of theirs.
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This page answers a timing question about animals you are already going to sell. If the question is whether an animal still earns their place in the herd at all, that is a different sum — use the Cull Calculator.
Barnyard Boss already knows all ten for every head you own, because it has been adding them up since the day the animal arrived.