Question @ calculating phosphorous levels in food

[Jenny and Sue]

Arrgh! I'm frustrated. I calculated the phosphorous levels of Merrick BG foods using Janet and Binky's calculator (after I called the company and got the "as fed per values"). On a different CRF board, though, they say that Merrick BG phosphorous levels are very high because they calculate it on a dry matter basis and said that is more accurate.

So, which is right?

Should the phosphorous content be calculated on dry matter or as fed per? I'm so confused.

This is what I came up with for Merrick BG:

I called Merrick and got the "as fed per values" for Merrick BG :

all 3.2 oz. cans
Beef: 12.91 protein, 7.57 fat, .28 carbs, .18 phosophorous; 846 kcal/kg (calculated) - a 3.2 oz can provides 76 kcal (calories) of metabolizable energy (calculated)

Chicken: 9.99 protein, 9.06 fat, .68 carbs, .39 ; 984 kcal/kg (calculated) - a 3.2 oz can provides 89 kcal (calories) of metabolizable energy (calculated).

Quail and Chicken: 11.03 protein, 9.21 fat, .52 carbs, .60 phosphorous; 859 kcal/kg (calculated) - a 3.2 oz can provides 79 kcal (calories) of metabolizable energy (calculated).

Salmon: 9.48 protein, 9.47 fat, .67 carbs, .67 phosphorous; 890kcal/kg (calculated) - a 3.2 oz can provides 80 kcal (calories) of metabolizable energy (calculated).

Tuna: 11.34 protein, 7.68 fat, .54 carbs, .48 phosphorous; 909 kcal/kg (calculated) - a 3.2 oz can provides 82 kcal (calories) of metabolizable energy (calculated).

Turkey: 11.58 protein, 10.22 fat, .68 carbs, .23 phosphorous; 945 kcal/kg (calculated) - a 3.2 oz can provides 85 kcal (calories) of metabolizable energy (calculated).

Using the spreadsheet from Janet and Binky,this is what I came up with:

Beef
Protein~41
Fat~58
Carbs~1
Fiber~.36
Phosph~163
Calories per 3.2 oz can~89

Chicken
Protein~31
Fat~67
Carbs~2
Fiber~.35
Phosph~157
Calories per 3.2 oz can~89

Turkey
Protein~31
Fat~67
Carbs~2
Fiber~.01
Phosph~177
Calories per 3.2 oz can~85

Quail and Chicken
Protein~33
Fat~66
Carbs~1.5
Fiber~.01
Phosph~505
Calories per 3.2 oz can~79

Salmon
Protein~29
Fat~69
Carbs~2
Fiber~.01
Phosph~577
Calories per 3.2 oz can~80

Tuna
Protein~37
Fat~61
Carbs~2
Fiber~.01
Phosph~449
Calories per 3.2 oz can~82

If these calculations are right, then the Beef, Chicken and Turkey varieties are great for kitties with CKD as well because they are so low in phosphorous!


So, does anyone know if this is accurate????

Thanks,
Jenny

 

[Larry and Kitties]

Your value look right. There is no difference if you use wet or dry matter basis since the values are based on the amount (mg) of ph per 100 calories in J&Bs tables and SS. Water does not have any calories. The wet as-fed values of ph will be a lot lower than the dry as-fed values since those numbers are based on % weight.

 

[Jenny and Sue]

Okay, so I'm not crazy? They said I'm wrong! cat(2)_steam