Hound Dog Mom,
That is a great compilation of articles on large breed growth. The most important tenets of large breed nutrition are to keep the puppy lean during the growth period and to feed foods that have a calcium level near 1% (dry diets).
Calcium levels over 1.3 % in a dry food are likely approaching or above the safe upper limit for growth. Since there is no benefit to feeding these higher calcium products to a growing large breed and there may well be risk to the developing skeleton, IMHO they should not be fed during the growth period of a large/giant breed puppy.
Unfortunately, manufactures may state their foods are appropriate for large breed growth when they exceed the recommended level and may even say it is a dietary factor other than calcium that is responsible for the growth problems seen in large breeds. It really is a buyer beware situation as even foods labeled as “large breed puppy” sometimes exceed the recommended level of calcium.
On a energy basis the recommended amount of calcium is 3 grams/1000 kcals. The National Research Council sets the safe upper limit for calcium during growth at 4.5 grams/1000kcals. The European Pet Food Association sets the limit at 4 grams calcium /1000 kcals in puppies less than 6 months. AAFCO allows 7.14 grams/1000 kcals which is why large breed puppy owners have to be vigilant.
Additionally, as you pointed out, when evaluating calcium levels in foods you have the know the actual calcium level in the food. Manufactures often report min. calcium levels so that their foods appear to have a calcium level lower than what they actually have.
