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Author Topic: First Step to Raw Recipe  (Read 8493 times)
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Mark T
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« Reply #15 on: November 27, 2009, 09:00:32 AM »

AC, thanks for that input, at 5% liver that fits perfectly with Cato's recommendation of "no more than 30 gms/week"

Regarding veggies, grains and fruits, try telling that to our cats. Just yesterday I caught one of our cats nibbling on a loaf of bread (again), just minutes out of the oven.
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Cato
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« Reply #16 on: November 27, 2009, 11:41:57 AM »

MarkT:  That's great of you to try raw on your kitty while yet young!  You'll never regret it. 

Yes, MarkT - I know it doesn't all add up.  The "no more than 30 grams of liver per cat per week" rule was taken from an book written by a veterinarian.  I read the vitamin A section more closely again last night and the good doctor I think may be referring to ADDITIONAL REAL LIVER TREATS on top of regular cat food which already has some liver or some kind of preformed vit A in it. 

I also read a study some months ago on vit A toxicosis in cats.  It appears that in order to over-dose a cat on vt A. massive amounts are needed - like 30,000IU of Vit A a week for several weeks in a row. 

The mean value of vitamin A content in ONE gram of chicken liver is 427IU (Denmark) or 333IU (Britain, United Kingdom) [mean and average ranges not yet published in the US].  So, if we give kitty 30 grams of liver per week, kitty will be STORING around 12810IU (Denmark) or 9990IU of Vitamin A.  This fits well with many raw feeder guidelines.  For example, Anitra Frazier recommends 10,000IU vit A per week, if I recall correctly. 

The NRC recommends a Daily Allowance of Pre-formed Vit A of 24.7micrograms (24.7 x3.3 = 81.51IU);
with a Safe Upper Limit of 2,469 IU.  So, usng lower limit of 81.51IU/day, kitty should ingest at least 570.7 MINIMUM per week of vit. A.  Safe upper limit will be 17,283IU per week.

I thnk we're pretty safe with 30 grams of liver in the recipe, ah?   Grin

Additional notes for the curious:

Vitamin A activity is measured in International Units (IU) and different vitamin A compounds have different activities:
1 IU =   0.300 mcg vitamin A alcohol (retinol)
   0.344 mcg vitamin A acetate (retinyl acetate)
   0.549 mcg vitamin A palmitate (retinyl palmitate)

or, measuring the activity of 1 mg of each compound:
1 mg retinol   = 3333 IU vitamin A
1 mg retinyl acetate   = 2907 IU vitamin A
1 mg retinyl palmitate   = 1818 IU vitamin A

Sources: 
English translation of Kolb E., Probleme eines hohen Gehalts an Vitamin A in der Leber von Kälbern, Rindern, Schafen und Schweinen für den Verbraucher. Umfang der Speicherung und teratogener Wirkungsmechanismus. Berl. Münch. Tierärztl. Wschr. 107, 342-347 (1994)

English translation of Kessler Jürg; Morel Isabelle, Vitamin A-Konzentration in Kalbslebern: Eine Praxiserhebung. Agrarforschung, 5 (5), 225-227, 1998

Leth Torben; Skotte Jacobsen Jytte, Vitamin A in Danish Pig, Calf, and Ox Liver. Journal of Food Composition and Analysis 6, 3-9 (1993)

Pikkarainen Seija A; Parviainen Markku T., Vitamin A Levels in Bovine and Pork Liver. Internat. J. Vit. Nutr. Res. 63 (1993), 86-88

Scotter MJ, Thorpe SA, Reynolds SL, Wilson LA & Lewis DJ: Survey of Animal Livers for Vitamin A Content. Food Additives and Contaminants, 1992, Vol. 9, No. 3, 237-242




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petslave
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« Reply #17 on: November 27, 2009, 09:30:09 PM »

Now I'm all nervous about the liver.  Is the amount in the T&T recipe OK?  I think each cat is getting around 10 grams a day (double batch with 100 g liver feeds 5 cats for around 2 days).

Course the canned food I've been feeding probably has way over that amount!
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Mark T
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« Reply #18 on: November 28, 2009, 02:13:24 PM »

Cato, thank you very much for your detailed and thorough reply, with references no less.  I have a better understanding of Vit A in cats as a result.

Quote
I thnk we're pretty safe with 30 grams of liver in the recipe, ah?   Grin
 
I guess that depends on how much a cat eats Smiley. One of my cats would eat two cups of your recipe in 3-4 days, so I would have to use less liver or they would get double the amount in a week.
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