Hydrolyzed porcine mucosa results from the enzymatic hydrolysis of clean digestive mucosal tissue from pigs, after heparin extraction. The hydrolyzed mucosa is sprayed into high protein soybean meal (SBM) and included in diets for weanling pigs as a substitute for animal plasma, fish meal, and other high quality protein sources (Bregendahl and Zimmerman, 2001; Corassa et al., 2007). Solà-Oriol et al. (2010) reported higher BW gain (BWG) and improved feed conversion ratio (FCR) in weanling pigs fed 5% hydrolyzed porcine mucosa sprayed into SBM (HPM) than in weanling pigs fed 3.82% fish meal or 3.32% potato protein. Martínez-Puig et al. (2007) and Solà-Oriol et al. (2011) attributed the improvement observed to the high palatability of HPM. However, the authors have not found any full report on the effect of inclusion of HPM on growth performance, small intestine mucosa morphology, and nutrient retention in broilers.