1325
Apparent total tract digestibility and Ileal digestibility of dry matter, nitrogen, energy and amino acids in conventional, Bacillus subtilis fermented and enzyme treated soybean meal fed to weanling pigs
This experiment was conducted to determine the apparent total tract digestibility (ATTD), apparent ileal digestibility (AID) and standardized ileal digestibility (SID) dry matter, nitrogen, energy and amino acids of 6 soybean products. The products were soybean meal (SBM), fermented soybean meal A (FSMA), fermented soybean meal B (FSMB), fermented soybean meal C (FSMC), enzyme treated soybean meal (ETSM) and speciality soya protein (HP300). There are six treatments: SBM, FSMA, FSMB, FSMC, HP300 and N-free dietary treatments. In the experiment, six ((Landrace × Yorkshire) × Duroc) weanling barrows with average BW 8.99± 0.40 kg were surgically equipped with simple T-cannulas approximately 15 cm prior to the ileo-cecal junction and allowed to a 6-week feeding trial. Results of the experiment showed that FSMC and HP300 had the greatest (90.03, 89.35 %; P < 0.05) ATTD for most AA, but the ATTD for Arg, Ile, Lys, Met and Phe in FSMB similar to FSMC. Piglet fed FSMC and HP300 had higher(89.02, 88.86 vs.85.84 %; 88.19, 87.69 vs. 84.42 %；P < 0.05) DM and energy digestibility compared to SBM. AID of DM, N and energy and total AA in FSMB, FSMC and HP300were higher (82.40, 82.71, 82.59 vs. 78.45 %; 82.54, 83.24, 82.95 vs. 79.33 %; 81.26, 82.27, 81.68 vs. 76.77 %; 80.90, 81.45, 80.78 vs. 77.83 %; P<0.05) than SBM in which the value was highest in the FSMC diet. The AID of Isoleucine was greater in pigs fed FSMB and HP300 than in FSMA. The AID of Arg, Leu, Phy and Val in FSMC was greatest of all the other soybean meals. The AID of Lys (74.73%) and total AA (77.90%) in FSMA was the least (P<0.05) among the entire soybean products, but the AID for most other AA in FSMA was not different from the value of AID of AA in SBM. The SID of His (82.28%), Lys (78.65%) and total AA (82.34%) in FSMA was the least (P<0.05) among all the protein sources but SID for most other AA in FSMA was not different from the SID of AA in SBM. In conclusion, dietary supplementation of FSMC and/or HP300 can improve the ATTD, AID and SID of DM, N, energy, total AA and most of the essential amino acids in weanling pigs.
Keywords: amino acids, apparent ileal digestibility, apparent total tract digestibility, fermented soybean meal, hamlet protein, weanling pigs