byproduct meal exists (Dong et al., 1993). Other animal
proteins such as hydrolyzed porcine intestines and a spent
hen–soybean meal (SBM) mixture are also available for
animal feeding, but for all of these ingredients there is a
lack of data on the digestibility of AA and the concentration
of DE and ME, which limits the use of these ingredients in
diets fed to weanling pigs. Therefore, the objectives of the
present experiments were to determine the concentration
of DE and ME and the apparent ileal digestibility (AID)
and the standardized ileal digestibility (SID) of AA and
CP in chicken meal, poultry byproduct meal, hydrolyzed
porcine intestines, and the spent hen–SBM mixture when
fed to weanling pigs and to compare these values to values
obtained for SBM.