Textured vegetable protein, effect

Another experiment compared the effects of feeding partially defatted beef with textured vegetable protein (TVP) derived from soy... 

Hill, R.C. C.F. Burrows G.W. Ellison J.E. Bauer. The effect of texturized vegetable protein from soy on nutrient digestibility compared to beef in cannulated dogs. /. Anim. Sci. 2001, 79, 2162-2171. 

Several soy products may be used as protein sources in dog foods. In dry extruded diets, both ileal and total tract crude protein digestibilities of soy-containing diets appear to be equal or superior to diets containing animal protein by-products. On the other hand, in canned foods, texturized vegetable protein can reduce dry matter and crude protein digestibilities by dogs, and soy protein sources usually increase fecal output. A lack of information is apparent on the effects of including soy protein sources in diets fed to cats. 

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