The hypothesis that the values obtained for the apparent total tract digestibility (ATTD) of energy and digestible energy (DE) and metabolizable energy (ME) in pistachio shell powder are not different from the values obtained for soybean hulls when fed to growing pigs. A basal diet containing corn, a diet containing corn and 20% pistachio shell powder, and a diet containing corn and 20% soybean hulls were formulated. Twenty-four growing pigs (initial body weight: 32.0 ± 1.7 kg) were allotted to the three diets in a randomized complete block design with eight pigs per diet. After a 7-d adaptation period, feces and urine were quantitatively collected for 4 days. The diets and feces were analyzed for dry matter, and all samples were analyzed for gross energy (GE). The results indicated that the ATTD of GE was greater (p < 0.05) for soybean hulls than for pistachio shell powder, but less (p < 0.05) than for corn. Pistachio shell powder provided less (p < 0.05) DE than corn (i.e., 1778 kcal/kg vs. 3787 kcal/kg; dry matter basis), but the DE in pistachio shell powder was not different from that in soybean hulls (i.e., 2010 kcal/kg; dry matter basis). In conclusion, pistachio shell powder can be used as an alternative ingredient in diets for growing pigs and provides 1778 kcal/kg of DE on a dry matter basis.
Kim et al. (Sun,) studied this question.