Hi Sherri and thanks everyone for the tags!
I have received values from the manufacturers on the foods I have
on the spreadsheet Here. I have noted Phosphorus values as well - I've been trying to keep Genghis' lower due to her advancing age. I was feeding FF but had some issues with cost, cost, and did I mention cost? And I think the phosphorus level is a little high for my girl.
I am no expert, but you need to be very careful when using the calculators that you are using "As Fed" or Dry Matter Basis values. The "Guaranteed Analysis" you often see on websites or on the can
sounds more accurate, but it is only a range of minimums or maximums that has a tendency to throw the final calculation off. You can usually only get As Fed or Dry Matter Basis values directly from the manufacturer (although in my experience, some companies think this is a state secret and refuse to disclose them, but that is another story!).
Do not despair - I think you are just fine feeding Shamus the Friskies you have been, even if you think the values are 12-15% - I know you had a bit of a BG issue earlier, so I understand why you are concerned. That said, I'd want to keep on a good track too, so keep in mind a few things.
- Anything can temporarily spike a BG reading, usually stress. Could be "bad" (=vet visit) or "good" (= he might have chased a bug, seen a bird, been startled).
- For a healthy cat in good weight, the wet food you are feeding is better than most dry foods. If you still feel less than confident feeding it, you could always mix what you already have with a very low carb food - shredded cooked chicken or turkey, chopped egg whites, or some of the zero carb canned varieties like Tiki Cat, Almo, or Boreal. These foods are likely not complete diets on their own as they don't have added taurine (99% sure about Tiki Cat, positive about Almo and Boreal) but you could supplement the Friskies with it to lower the % of calories from carbs overall.
Keep doing what you are doing - unless Shamus' BG is consistently higher for days, I think you are already on an excellent track.