The other ingredients include protein rich meat concentrate and salmon meal, besides rice bran. (usbones.com)
There are sauces that contain mustard and other spices and have proven to be great for rich meats like pork because they provide a contrast to the flavor. (thefashionablehousewife.com)
However, as we mentioned earlier, chicken meal and turkey meal are both high quality sources of protein - rich meat concentrates. (mysweetpuppy.net)