How much/often do you want to feed them mince? Just plain mince isn't a balanced diet; you either need to add some organs and (raw) bones or else use supplements to balance it out if you want to make it a significant part of their diet.
Hi ,i was thinking of adding cooked beef /turkey mince to their wet food .At the moment they each get half a100g wet pouch per meal with some dry food added to it .Sometimes Misha and Callie will leave half of it uneaten .Also the cost is a factor ,i could feed them cheap dry food but i don't want to do that .
Its good because cats being obligate carnivores, they need meat every day to stay healthy. Thus ground meat is a good option. their body is designed to absorb nutrients best from animal proteins. Gove in small measure sand should be fresh.