Comparative efficacy of different soy protein sources on growth performance, nutrient digestibility and intestinal morphology in weaned pigs

초록

To elucidate the efficacy of different soy protein sources on piglet's performance, a total of 280 weaned piglets (DurocxYorkshirexLandrace, 23 3 d of age, 5.86 +/- 0.45 kg initial BW) were allotted to 5 treatment diets comprising soybean meal (SBM), soy protein concentrate (SPC), Hamlet protein (HP300), fungal (Aspergillus oryzae) fermented soy protein (FSP-A), and fungal plus bacterial (A. oryzae+Bacillus subtilis) fermented soy protein (FSP-B), respectively. Experimental diets for feeding trial were formulated to contain each soy protein sources at 8% level to com-whey powder basal diet. There were 14 pigs per pen and 4 pens per treatment. Experimental diets were fed from 0 to 14 d after weaning and then a common commercial diet was fed from 15 to 35 d. Also for ileal digestibility studies, 18 pigs were assigned to 6 dietary treatments as N-free, SBM, SPC, HP300, FSP-A and FSP-B with T-canulation at distal ileum for 6 days. At 14(th) d of experimental feeding, the ADG was significantly higher (p < 0.05) in SPC fed diet as compared with others. Similar trend was noticed during the 15-35 d and overall study (0-35 d). All the processed soy protein sources tested in this experiment improved (p < 0.05) growth than SBM during overall study. The nutrient digestibility of GE, DM, CP and Ca showed lower (p < 0.05) values in SBM and FSP-A fed groups than SPC and FSP-13 treatments. The apparent ileal digestibility of TEAA, non-TEAA and TAA showed lower (p < 0.05) in SBM treatments compared with other soy protein sources. The true ileal digestibility of TEAA, non-TEAA and TAA were lower (p < 0.05) in SBM fed group than SPC and HP300 treatments, and lower than FSP treatments though they didn't achieve significant difference (p > 0.05). Villous height and crypt depth was not affected by dietary treatments. In conclusion, the growth and digestibility of nutrients in weaned pigs fed SPC was superior to others. Also FSP-A and FSP-B showed improved performance than those fed SBM.

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