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Hi! I'm CalCatDoc and I can help with your question.
Specifically addressing your question about feeding beef in addition to the K/D - the K/D has been precisely formulated to meet the needs of patients with kidney disease. Keeping the phosphorus down is critical - and muscle meat like beef is very high in phosphorus. This will put the calcium:phosphorus ratio out of balance and can really adversely affect the cat's condition.
With respect to the quality of ingredients - I guess I need to ask what leads you to believe that K/D contains inferior ingredients? And in comparison to what?
Sorry, had to be AFK for a few. Let me read through your response.
Well I guess we have differing opinions about what constitutes quality so I will go ahead and release this question back to the pool and let someone else help you.