“…Using the NRC model, 53 individual diet calculations were made with experimental diets from 10 published studies (Adams et al, 1989(Adams et al, , 1993Hollingsworth-Jenkins et al, 1996;Lamb et al, 1997;Lardy et al, 1997;Villalobos et al, 1997;Lardy et al, 1999;Ciminski et al, 2002;Jordan et al, 2002;Patterson et al, 2003a) to evaluate MP balance. Of the 53 diets evaluated, 47 had negative MP balances.…”