Recent studies by The IAMS™ Company examined how the type of protein in a diet affected body composition of adult and senior dogs.1
Adult and senior dogs were fed diets with varying amounts of protein from chicken and corn-gluten meal, and their body composition (muscle versus fat tissue) was analyzed. In addition, levels of key blood and muscle proteins were measured.
Compared with dogs fed a diet with 100% chicken protein, dogs fed diets with decreasing levels of chicken and increasing levels of corn-gluten meal had the following:
- Decreased lean tissue
- Increased body fat
- Decreased levels of blood proteins routinely used as markers of superior nutritional status
This was independent of the overall dietary protein level (12% or 28%), which was also examined in each of the four test groups.
As dogs age, body composition and muscle-specific proteins decline. Therefore, another study looked at the differences between feeding senior dogs a 32%-protein chicken-based diet, a 32%-protein chicken and corn-gluten meal diet, or a 16%-protein chicken-based diet. Senior dogs fed the 32%-chicken protein, chicken-based diet had better body composition and a muscle-specific protein pattern identical to that in healthy young-adult dogs. However, those results were not seen in either of the other two diets.