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Ask Dr. Michael Salkin Your Own Question
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Cat Veterinary
Satisfied Customers: 25215
Experience:  University of California at Davis graduate veterinarian with 44 years of experience.
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How much phosphorus would raw stewing beef have in it?

Customer Question

How much phosphorus would raw stewing beef have in it?
Submitted: 1 year ago.
Category: Cat Veterinary
Expert:  Dr. Michael Salkin replied 1 year ago.

On average, fresh meat contains 65 mg of phosphorus per ounce. A balanced protein-restricted home-cooked recipe for a cat might contain 3 ounces of beef. Please see here:

ground beef, 10% fat, cooked, 3 ounces

rice, white, long-grain, cooked. 3/4 cup

canola oil, 4 tsp

salt substitute (potassium chloride), 1/4 tsp

salt, iodized (sodium chloride), 1/8 tsp

bone meal powder, 1/4 tsp

baking soda substitute (calcium carbonate), 1/8 tsp

multivitamin & mineral tablet, kids complete, 1/2 each

vitamin K, 100 mcg vitamin K per tablet, 1 tablet

taurine powder, 1000mg per 1/4 tsp, 1/4 tsp

This provides 517 kcal - the daily requirement of a 20 lb cat.

Please respond with further questions or concerns if you wish.

Customer: replied 1 year ago.
Thank you so much. Do you have any idea what that 65 grams might work out to be on a dry matter basis? Because they say that cats with kidney issues should have only about .5% phosphorus on a dry matter basis.
Expert:  Dr. Michael Salkin replied 1 year ago.

That's actually a complicated computation requiring my knowing the amount of water in the complete diet. I can tell you, however, that the recipe I posted above contains 0.43% DM of phosphorus. Please continue our conversation if you wish.

Customer: replied 1 year ago.
Okay last question - can the beef be served raw? He isn't so much into the cooked beef.
Expert:  Dr. Michael Salkin replied 1 year ago.

It wouldn't be my preference but if handled carefully should be safe. Wash it thoroughly.

Customer: replied 1 year ago.
Thank you. Sorry - i do have one more. Will cooking or freezing increase or decrease phosphorus in meat or diets? And in general what makes some cat foods higher in phosphorus than others? It can just be a protein relationship because some diets are hi
Customer: replied 1 year ago.
high in protein but relatively low in phosphorus
Expert:  Dr. Michael Salkin replied 1 year ago.

No.

In general, meats are low in calcium and high in phosphorus. Veggies are high in calcium and low in phosphorus.

Customer: replied 1 year ago.
Hi Dr. Salkin - I just had a follow up question. I'm curious - it seems by far the majority of canned cat foods are well over 1% phosphorus on a dry matter basis. And even the raw manufacturers of beef diets tend to be over 1% phosphorus. Why is the aforementioned so low in phosphorus (.43% dry matter)? What makes it that way? or what makes the manufactured diets so high in phosphorus?
Expert:  Dr. Michael Salkin replied 1 year ago.

Phosphorus can be restricted by simply choosing ingredients that are low in phosphorus and vice versa. Veterinary nutritionists are employed by food manufacturers to ensure that diets are what they're purported to be. The recipe I provided above was designed by Patricia A. Schenck, DVM, PhD, a board certified veterinary nutritionist and can be found in her Home-Prepared Dog and Cat Diets, 2nd Ed., 2010. It's beyond the scope of this venue for me to list all of the low phosphorus foods but you could google them easily.

I can't set a follow-up in this venue so please return to our conversation - even after rating - with an update at your convenience.