Abstract
To elucidate the efficacy of different levels of microbial-fermented soy proteins (FSP) on piglet performance, a total of 240 weaned piglets (L×Y×D, 22±3 d of age, 5.16±0.07 kg initial BW) were allotted to 4 treatment diets comprising control, FSP-3%, FSP-6% and FSP-9%. The fermented soybean product named Pepsoygen® was utilized for the study. There were 15 pigs per pen and 4 pens per treatment. The control diet contained 15% soybean meal (SBM), and SBM for the treatment diets was replaced at 3, 6 and 9% with FSP, respectively. Experimental diets were fed from 0 to 14 d (phase-I) after weaning and then a common commercial diet was fed from 15 to 35 d (phase-II), There was a linear (p<0.05) increase in ADG and ADFI at both phases of measurement. The feed to gain ratio was also improved, showing a linear (p<0.01) trend as the level of supplementation increased. Except for phosphorus, the digestibility of all other nutrients was improved linearly (p<0.05) in the FSP added diets. However, villous height and crypt depth were not affected by dietary treatments. No special effect on intestinal morphology was noticed between FSP-added and control diets. In conclusion, the growth, digestibility of nutrients and morphological changes in weaned pigs fed FSP showed improved performance at higher levels of supplementation.
Highlights
Soybean meal is an essential component in the feed formulation used for farm animals throughout the world
The analyzed amino acid composition of fermented soy protein for essential amino acid (EAA) was nearly similar to soybean meal (SBM) but the CP content was higher in FSP than SBM
At 15-35 d, the average daily gain (ADG) was higher (p
Summary
Soybean meal is an essential component in the feed formulation used for farm animals throughout the world. Because of antigenic activity and antinutritional factors, young animals such as calves and piglets are sensitive to SBM and poor growth and digestive disorders are common when it is fed (Lalles, 1993). Milk products such as dried skim milk and dried whey as well as other animal protein sources such as spraydried plasma proteins are typical feed ingredients in young pigs due to their high palatability and digestibility, but these are somewhat expensive. Fermented soybean meals were shown to contain proteins with high proportion of small peptides due to enzymatic degradation during fermentation process (Hong et al, 2004)
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