The "balanced diet" claim of the pet food industry always cracks me up. Essentially, they are making us believe that a highly processed food of questionable ingredients is superior to a varied diet of fresh foods.
I am not sure how we keep buying into this claim. Just from a common sense point of view. How is it, that we as humans survive when we feed our kids, we don't weigh all the macronutrients or only feed our kids a exactly "balanced" diet of exactly the same every day. It would be like feeding our kids one kind of cereal day in, day out and claiming this is better for humans than a varied diet of fresh ingredients.
Now, technically the kibble that we are feeding our dogs has a exact balance of macronutrients (protein, carbs, fat). The problem is, that it doesn't work that way. For the calculation of pet food manufactures, they are only required to use crude protein, which doesn't take into consideration the biological value and the digestability.
The biological value depends on the composition of amino acids that the protein is made up of (i.e Eggs are 100, fish meal is 92, beef 78, wheat gluten 40).
Digestability is the extent to which the gi tract can absorb it, one source maybe 70 % digestible, the other 90 %. Some proteins (like those in hair) are less digestible because they are harder or even impossible for the body to break down
However, crude protein makes no differentiation, all proteins are the same in the calculation for pet food manufacturers. So depending on the ingredients the "balance" of nutrients may not be what the lable says. And in fact it may be quite unbalanced!
Not only that but the processing will increase the loss of nutrients, vitamins, minerals. To make up for that pet food manufacturers will add a number of synthetic or isolated vitamins. If that doesn't get destroyed through heat processing, through interactions with other substances, or simply by exposure to air during storage.
That all being said, I don't think we need to become animal nutrionists to feed our pets a varied diet of fresh food. It balances itself out over time, just as it does when we eat a whole variety of fresh, unprocessed foods.
A couple of things to keep in mind. If you feed raw meat only without bones it can throw of the calcium : phosphorus ratio. So just throwing a piece of raw meat every day won't do the trick.
You can feed the meat but then you need to supplement with raw bones, chicken necks, turkey necks, etc every other day. About 30 % of my dog's diet is raw, meaty bones.
About 1/3 of the other food is veggies and grains (oatmeal, rice, millet, etc) and 2/3 meat. I cook the grains and veggies and add the raw meat. Here is a thread that gives you kind of an idea of what I feed my dogs.
http://69.0.137.118/dc/dcboard.php?..._id=379713&mesg_id=379713&listing_type=search
Check out
http://www.dogaware.com/dogfeeding.html, it gives you a pretty good idea of what to feed.
I would say, you won't need to weigh every morsel of food that goes in your pets' mouth. I don't stress over it, I don't weigh every morsel that goes in my kids' mouth either, nor do I think I need to. However, if you are very detail oriented and rather get the recipes and exact recommendations, I would recommend Dr. Pitcairn's book "The Complete Guide to Natural Health for Cats and Dogs". It has recipes and lots of good information.
Don't worry about feeding a balanced diet with EVERY meal.
Carola