Hi Sheltie’s Mom –
If you’re feeding a balanced commercial food you don’t need to add any organ meat and I’d keep the tripe to 20% or less of the meal. If you’re making your own food organ meat should account for 10% of the diet (5% liver and 5% other organs) and tripe can account for as much of the other 90% of the diet as you want. Tripe has a 1:1 calcium to phosphorus ratio so calcium doesn’t have to be supplemented to account for the tripe. Organ meat is very rich in phosphorus and contains almost no calcium so you’ll want to add around 1,200 mg. calcium per pound of organ meat fed. Gullet and trachea contain mostly cartilage and a small amount of muscle meat – they have close to a 1:1 calcium to phosphorus ratio. If you’re just feeding trachea or gullet once in awhile as a chew, I wouldn’t worry about balancing the calcium to phosphorus ratio.
