Whats the difference between the Sold and Sold (Culled) statuses?
This distinction is really up to the individual herd to determine what works for them, and for reporting purposes that will work as long as the herd is consistent in how it makes its entries. One defining line could be that animals that are culled by selling are those that are substandard, and are being sold without papers as family milkers, as pet wethers, or butcher animals, etc.
