Thanks on the SS, I just found it made life simpler to color code what I was looking for. I actually too Dr. Lisa's whole list and reformatted it back into a SS. What I have in the Tab are just what I think will work for carbs and Phos for Tess. Unfortunately there are a lot of new foods out there and I haven't updated it recently.
You got the .50% from Tanya's list? If so that is not the "As Fed" number I use in the calculation it is Dry Matter, so you would need to get it back to where it is the % of the food w/ the moisture in it. Unfortunately, Tanya doesn't list the % of moisture so we have to go w/ the Guaranteed Analysis of not more than 78% and hope that is close to the what it actually is.
If so then the DM is 22% of the food. Multiply that times the .50 Phos would give you .11% Phos As Fed. Use that for the calculation:
- .11 x 156 = 17.16 ÷ 191.95 = 0.089 x 1000 = 89.4 mg Phos per 100 kcal
So, yes that is a good food for Phos!

I may have to get some. And I'm also glad to see that Tanya's has now listed carbs on their updated list! YAY! Remember though, if you look at the carbs on Tanya's list it will be different from how we discuss carbs here because we use Dr. Lisa's list and that is ME.
It took me a week of studying Dr. Lisa's articles to understand the differences in the way nutrition is reported and to use her calculations. Here's what I understand about the differences:
- Guaranteed Analysis: -- is what AAFCO requires to be put on cans, but since some numbers are maximum and some minimum, they can't be used to calculate carbs, which are not required to be listed and are what we really need to know. Moreover, Phosphorus is listed as a minimum when it is included and who cares about that, we need to know the maximum! :roll:
As Fed: -- actual results of the food being analyzed, I think they have to do it twice a year. Some of the better companies will actually post this on their websites, otherwise you have to call and talk to an operator who really doesn't understand what you are asking for.
Dry Matter: -- What is left after dividing the As Fed numbers by what remains after the Moisture is subtracted. Subtract the As Fed Moisture from 100 and what is left is the solids contained in the food (Total DM). Divide each of the As Fed nutrient numbers by the Total DM number for the DM for each of the nutrients.
Metabolized Energy: -- This is how many calories come from protein, fat and carbs. There won't be a ME number for Phos because it has no calories. There are several more steps to calculate the ME but I'm stopping because it's making my head swim again! @-) I set all the formulas up on a SS so I wouldn't have to think about it every time!
p.s. My husband who is an engineer and former physics major helped me figure out all the equations for the SS. Especially getting the decimals right when converting to and from %. ohmygod_smile