Put in what they're worth, what they'll cost to carry, and what you think they'll bring later. This works out which choice leaves you better off, and shows every step. Free, nothing to sign up for, and nothing leaves your phone.
Barnyard Boss already knows all eight for every head you own — because it has been keeping the cost as it happened. It runs this same arithmetic on your whole herd, and it still has last month's when you want to compare.
Free to keep records. You only pay if you want the arithmetic.
See Barnyard Boss