Effect of Body Weight on the Biological Value of Proteins for Growing Swine

Data are presented to show that the biological value of protein fed at a level of 10% decreases as pigs increase in body weight. It is suggested that studies on biological value of protein for growing pigs be designed to permit analyses by covariance as a means of measuring the collective errors introduced by variables associated with advancing weight and age. Comparisons of data from various studies may then be made without confounding with these factors.