Comparative Efficacy of Different Soy Protein Sources on Growth Performance, Nutrient Digestibility and Intestinal Morphology in Weaned Pigs

Abstract

To elucidate the efficacy of different soy protein sources on piglet's performance, a total of 280 weaned piglets (Duroc×Yorkshire×Landrace, 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 corn-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 Tcanulation 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-B 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.

Determination of standardized ileal crude protein and amino acid digestibilities in protein supplements for piglets

“…The SID in SBM hp , reported herein, are in good agreement with those reported by Yang et al (2007), whereas Walker et al (1986) reported up to 17 percentage units greater SID. For soy protein concentrate, reports on SID of indispensable AA vary between 94% and 100% (Walker et al, 1986) and between 81% and 91% (Yun et al, 2005;Yang et al, 2007). Moreover, Yun et al (2005) and Yang et al (2007) determined up to 6 percentage units smaller SID of indispensable AA in soy protein concentrate compared with the present study, whereas Walker et al (1986) reported up to 17 percentage units greater SID of indispensable AA in soy protein concentrate than the present study.…”

“…For piglets, reports on SID of indispensable AA in soy protein concentrate and soybean meal are not consistent between studies. For example, SID of indispensable AA in soybean meal range from 86% to 98% and from 76 to 86% in studies by Walker et al (1986) and Yang et al (2007), respectively. The SID in SBM hp , reported herein, are in good agreement with those reported by Yang et al (2007), whereas Walker et al (1986) reported up to 17 percentage units greater SID.…”

“…For example, SID of indispensable AA in soybean meal range from 86% to 98% and from 76 to 86% in studies by Walker et al (1986) and Yang et al (2007), respectively. The SID in SBM hp , reported herein, are in good agreement with those reported by Yang et al (2007), whereas Walker et al (1986) reported up to 17 percentage units greater SID. For soy protein concentrate, reports on SID of indispensable AA vary between 94% and 100% (Walker et al, 1986) and between 81% and 91% (Yun et al, 2005;Yang et al, 2007).…”

Substitution of blood plasma with soy protein concentrate in piglet diet

“…Nevertheless, despite the positive influence of spray-dried plasma on piglet performance in the present study, the diet containing 5% BP did not lead to the best performance; however, the diet containing 2.5% BP and 2.5% SPC led to the best performance. This can be explained by the reduced stimulation of the immune system caused by the presence of spray-dried plasma and by the protein quality of the soy protein concentrate, together with its high digestibility, as described by Yang et al (2007).…”

“…Soy protein concentrate (SPC), which does not contain antinutritional factors, such as allergenic proteins and oligosaccharides that are present in soybean meal, is effective in improving the performance of post-weaning piglets (Lenehan et al, 2007;Yang et al, 2007).…”