Originally Posted by pearce1974
I have recently acquired a neutered male cat who is happily on friskies dry gourmet poultry and 9 lives canned when I got him and I would like to change for preventative measures. this is the breakdown:
friskies dry gourmet poultry: phosphorus 1%
9 lives chicken and tuna wet: ash 3.5 %
I looked online at the purina pro plan urinary tract health for adult cats and while the wet looked promising the dry had 6.2% ash! but Phosphorus (P) (Min.) 0.6%
Magnesium (Mg) (Max.) 0.075% looked good.
the wet: 1.5% ash
What foods would meet my requirements for preventative health. this is a great cat but I would like to better his diet. Please respond asap!! thanks!!
I'll wait for the experts to give you some ideas for specific foods.
For urinary tract health, the most important thing is moisture IMO, so wet food in general is good. Of course the recall mess limits your choices now, and that's a bummer. If he has a history of bladder/urinary problems, I would suggest avoiding "fishy" flavors. If he doesn't have a history of trouble, I would still only serve the fishy foods in moderation....lean toward the other meats instead.
The reason the ash %'s look so different in wet and dry is because the numbers are not expressed in the same terms (dry matter). The wet food %'s have the moisture factored in. So you have to convert to compare "apples to apples".
Since most canned food is about 78% moisture, an easy quick way to estimate the dry matter %'s is to multiply by 4. So on the can you see
Ash 1.5% ...multiply by 4 and you get 6%. That's an estimate.
If you want to be exact, you take 100 minus the moisture %
100%-78% = 22% - this gives you the % of the food that is "dry" ..ie total minus water = dry
Then divide your values on the can by that (22)
So you see Ash 1.5%, divide that by 22
1.5 divided by 22 equals .068 ...multiply by 100 to make it a percentage and that gives you the dry matter %..which is 6.8% ...so pretty close to the estimate done the easy way.
I'll spare you any further math details..but to be fair you can make the same conversion for the dry food...because I'm guessing it's 10% moisture. Long story short, the bare bones "dry matter" Ash % for the dry you mentioned (purina pro plan urinary tract health) is 6.9%. ...if it shows 6.2% on label w/ a 10% moisture content.
This is also why the protein % looks lower in canned food...but it's not. When you compare dry matter to dry matter, the wet's protein numbers are generally higher than dry. It's very confusing for the consumer.
I hope I didn't completely confuse you.