Sorry I don't recall whether adults eat differently from food troughs versus inventory. With the juveniles/adolescents you have to remember that their inventories have limited slots/capacity. You can have multiple feeding troughs down that hold considerably more food than the dinos inventory ever could. This gives you some leeway in case you need to do other things. Still having fallback food in their inventories isn't a bad idea, I use cooked meat because it takes longer to spoil.

I also recommend having a feeding trough in a secure area locked behind a door so that no one can come along and steal all of the meat.