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Location: Glasgow, UK
Joined: Jan 2008
Posts: 810
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Originally Posted by
Ziva
I agree, when talking the "best" food, it's as nature intended - raw. It's around 20% protein (which is obviously high quality), 15% fat and 65% water, which makes it an ideal food for large breed puppies.
Ziva, you told me the same thing and I took it on board at the time. But I've since realised that there's a serious flaw in your logic, and a meat diet is in fact much higher protein than that.
I'll try and explain...
I have a bag of James Wellbeloved kibble in front of me and it breaks down as follows:
21% protein
10.5% oil/fat
4.8% fibre
9.5% ash
The amount of water and carbs aren't stated, but the typical is 10% moisture in kibble, which leaves around 40% carbs.
Raw minced beef (as an example) works out as approximately:
20% fat
20% protein
60% water
Now your argument is that they both have roughly the same percentage of protein. But in terms of the dog's diet (rather than the delivery of the diet) they most certainly don't.
You have to discount the water in both diets to get the true percentage of protein in the diet. After all, if you added half a pint of water to your dog's kibble it wouldn't change the percentage of the energy that he gets from protein.
So to calculate the dry matter basis we calculate as follows (assuming 10% moisture):
21 divided by 90 times 100 =
23.3% protein
Now calculate the dry matter basis of raw mince (assuming 60% moisture):
20 divided by 40 times 100 =
50% protein
Or to look at it from another angle, consider the recommended feeding guidelines for each diet.
For my 10kg dog the recommended amount of kibble is 180 grams per day. That's
21 divided by 100 times 180 =
37.8 grams of protein a day
The recommended amount of raw meat is 2.5% of bodyweight which works out as 250 grams a day. That's
20 divided by 100 times 250 =
50 grams of protein a day
So the actual amount of protein you're dog is getting each day on an all meat diet is quite a bit higher. And what is more, the percentage is higher still as there are no carbs to 'dilute' the protein in the diet.
Of course, the logical thing to do next is to figure out what percentage of calories come from each component in the diet. I haven't got time to do that right now, but will figure it out when I get home. It could well be that as fat is much richer in calories than carbs the percentage of energy from protein is the same in both diets. I guess you need to know more about why they recommend low protein levels for large breed pups. If it's the actual amount in grams of protein that must be kept low then raw might well have too much. However, if it's the percentage of total calories from protein that must be kept low it may well be fine.
Also you need to weigh up the differing arguments as to digestibility. Some say that the protein sources in raw are much more digestable, indicting that you'd want your pup to be getting even LESS protein on an all meat raw diet. Others say that cooking partially digests food and the dog can therefore make use of more of the protein in a good quality kibble (such as Burns or JWB). If the latter is true then the higher volume of protein in raw might be ok.
But certainly if you stick to feeding guidlines you'll be feeding your dog more grams of protein on raw meat than you would be on JWB.