Is meat by-product a good protein source for dogs?

I’ve primarily seen dairy, soy, and sometimes egg as recommend protein sources for dog’s with HE.
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The rotation of protein sources plays an integral part in feeding a raw food diet to your canine and feline. Through an ongoing rotation of proteins, you will offer your pet a varied source of amino acids and fats, the two most crucial elements of a wholesome diet for dogs and cats. Each protein source offers different omega fatty acid structures.We recommend rotating your pet's food source often. Most consumers will rotate to a new protein source after each bag is finished. While you can rotate each protein source daily, we don't recommend feeding multiple protein sources for one meal.If your animal is allergic to a particular protein source, simply eliminate that source from the rotation. You can utilize our wide selection of proteins to offer your pet protein alternatives.
Best Protein Sources for Dogs
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Results: As a protein source, lamb meal showed significantly lower values for multiple measures of protein quality and essential amino acid content when compared with both poultry meal and fish meal. Even though all three diets were formulated to provide complete and balanced nutrition, the lamb meal diet was found to be deficient in the essential amino acid methionine, when digestibility was taken into account. Although differences between poultry and fish meals were not as dramatic, poultry meal was of lower quality than fish meal. As a protein source in dog food, fish meal had the highest values on almost all quality measures, including digestibility and essential amino acid content. When tested in adult dogs, the protein digestibility values of the three foods were 71.5, 80.2, and 87.0 for lamb meal, poultry meal and fish meal, respectively. Overall, this study suggests that, at least for the sources used in this work, the order of protein quality was lamb meal (poor), poultry meal (moderate), and fish meal (high). Additionally, although the reported level of lamb meal in the diet exceeded the minimum methionine requirement for adult dogs, the actual amount of methionine that was available to the dogs (i.e. was digested) was less than their minimum requirement for this nutrient. The Best Protein Sources For Dogs - - Bully Max
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Photo provided by FlickrBest Protein Sources for Dogs | SlimDoggy
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The digestive tracts of dogs and cats are much smaller than those of humans. Typical food transit time is 12-30 hours for dogs and 12-24 hours for cats, much lower than the 30 hours to 5 day transit times in humans. Shorter transit times mean that dogs and cats are not able to fully process many grains and other forms of carbohydrates. Pet foods that uses grains and vegetables as protein sources are not optimal for dogs and cats. As such, it is crucial that pet owners read their pet food labels carefully to identify foods that adequately supply the correct sources of protein.The digestive tracts of dogs and cats are much smaller than those of humans. Typical food transit time is 12-30 hours for dogs and 12-24 hours for cats, much lower than the 30 hours to 5 day transit times in humans. Shorter transit times mean that dogs and cats are not able to fully process many grains and other forms of carbohydrates. Pet foods that uses grains and vegetables as protein sources are not optimal for dogs and cats. As such, it is crucial that pet owners read their pet food labels carefully to identify foods that adequately supply the correct sources of protein.