Research from the University of Illinois is helping to determine the quality of protein in wheat middlings and red dog. Both are co-products of the wheat milling process. Each can be fed to pigs and other livestock.
There is information about the digestibility of crude protein in some wheat co-products produced in Canada and China, says University of Illinois Animal Scientist Hans Stein, but only very limited information about the nutritional value of wheat middlings and red dog produced in the United States.
Stein and U of I researcher Gloria Casas fed wheat middlings from 8 different states and red dog from Iowa to growing pigs. Despite the variety in the wheat middlings sources the concentration of crude protein were generally consistent. However, they did find some variation in the digestibility of the amino acids.
The red dog contained slightly less crude protein than wheat middlings.
Stein says the results of this study provide guidance to producers who hope to incorporate wheat co-products into diets fed to pigs. The paper appears in the June 2017 issue of the Journal of Animal Science. The National Pork Board provided funding for the study.