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An experiment was conducted to test the hypothesis that spray dried plasma (SDP) increases the apparent total tract digestibility (ATTD) of gross energy (GE), nitrogen (N), total dietary fiber (TDF), Ca, and P and the standardized total tract digestibility (STTD) of P from other ingredients in diets for young pigs. Eighty barrows (body weight: 9.30 ± 0.97 kg) housed in metabolism crates were allotted to a randomized complete block design with 10 diets and 2 blocks. Diets typically used in 4 regions using combinations of corn, soybean meal, wheat, barley, or rice were formulated: U.S.A., European Union, Canada, and Asia, and included 0 or 6% SDP. Differences between measured and predicted values for ATTD and STTD of energy and nutrients in diets with SDP were calculated. Data were analyzed using PROC MIXED of SAS as a 2 × 4 factorial with 2 SDP levels and 4 regions. When 6% SDP was included in the diet, ATTD and STTD values, except TDF, were increased (P &amp;lt; 0.05) compared with diets without SDP (Table 1). The ATTD of GE, TDF, and P and the STTD of P was greater (P &amp;lt; 0.05) for the Asia diet compared with the other diets. The measured ATTD of TDF was greater (P &amp;lt; 0.05) than the predicted for the U.S.A. and European Union diets (Table 2), and the measured ATTD of GE, N, Ca, and P and STTD of P was greater (P &amp;lt; 0.05) than the predicted for the Asia diet compared with the other diets. In conclusion, addition of 6% SDP to a diet increases the ATTD of energy and nutrients and the STTD of P regardless of diet composition, and therefore, the actual ATTD of energy and nutrients and the STTD of P in diets with SDP may be greater than predicted.

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137 Inclusion of Spray Dried Plasma in Diets Based on Different Ingredient Combinations Increases the Digestibility of Energy, Fiber, Ca, and P by Young Pigs