Access a "Ledger" or "Clipboard" item that shows:
Allow players to buy and apply colored ear tags to livestock. This would help track specific bloodlines or age groups at a glance. File: Ranch.Simulator.v0.573.zip ...
If the herd management isn't what you had in mind, here are other areas where features are often "made" or requested for v0.573: Access a "Ledger" or "Clipboard" item that shows: