On your turn, you can use one of the two dice you chose (with any number) to take a Feedbag. You can use the Feedbag immediately when selling one of your herds.
You can have any number of Feedbags in your supply.
Each time you sell a Herd (during the game or during the final scoring), you can discard up to 2 Feedbags. For each Feedbag you discard, you can increase the value of the most valuable Cattle Tile in the Herd by 1. So you could increase a Cattle Tile of value 12 to a value of at most 14. Remove any discarded Feedbags from the game.