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One experiment was conducted to evaluate the effect of a single cell protein (SCP) produced by Corynebacterium ammoniagenes on ileal amino acid digestibility in growing pigs. Single cell protein (SCP) is a microbial protein extracted from pure or mixed culture of algae, yeasts, fungi or bacteria. Compared to fish meal (FM), most sources of SCP (from bacteria and yeast) have similar lysine (Lys), methionine and cysteine content, and a higher proportion of tryptophan and threonine. Different studies have shown that SCP can replace up to 550 g soybean meal (SBM)/kg without impairing growth performance in weanling and growing-finishing pigs. Nine barrows [(Yorkshire×Landrace)×(Hampshire×Duroc)] with an initial body weight (BW) of 20.2 ± 1.47 kg fitted with a T-cannula in the distal ileum were allotted to a 3×3 Latin square with three diets and three periods per square. Pigs were weighed individually at the beginning of each experimental period that lasted 7 days. After a 5 days adaptation period to the diet, ileal digesta samples were collected form 08:00 and 18:00 h on days 6 and 7. Two diets containing 300g of soybean meal (SBM) or SCP as the only source of amino acid and a nitrogen-free diet were formulated.
The results showed that SCP contained higher crude protein (CP), methionine and threonine concentration than SBM. The coefficient of apparent ileal digestibility (CAID) and standardized ileal digestibility (CSID) of CP were lower (P<0.05) for SCP than for SBM. The SCP had lower (P<0.05) CAID and CSID for all indispensable AA except Lys, methionine, threonine and valine. Also, the CAID for serine and tyrosine was lower (P<0.05) in SCP than in SBM and with opposite result for glutamine.
The results provide information on the amino acid composition and digestibility of a new protein source in growing pigs.
J P Wanga, J D Kim, J E Kim and I H Kim (2013). Amino acid digestibility of single cell protein from Corynebacterium ammoniagenes in growing pigs. Animal Feed Science and Technology. 180;111–114. doi:10.1016/j.anifeedsci.2012.12.006