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Single cell protein (SCP) typically refers to sources of mixed protein extracted from pure and mixed cultures of microorganisms like yeasts, bacteria, fungi and algae, grown in large scale culture systems (Nasseri et al., 2011). SCP can be produced using a variety of raw substrates from inexpensive agro-industrial by-products and can be used in poultry feed as an alternative protein source to soyabean meal or fishmeal (El-Deek et al., 2009). Corynebacterium ammoniagenes, a small, non-moving Grampositive soil bacterium, has been used on sugars as a substrate to produce amino acid such as L-lysine and inosine 5’-monophosphate. C. ammoniagenesderived SCP has been marketed in livestock industry as a functional feed supplement to promote growth or immune system development, or as a flavour enhancer to increase palatability. It contains crude protein (609 g CP · kg−1 dry matter (DM)), ether extract (79 g EE · kg−1 DM) and balanced amino acids. In comparison with fishmeal it is characterized by lower lysine content (Zhang et al., 2013). Zhang et al. (2013) further reported that C. ammoniagenesABSTRACT. In total six hundred, day-old Ross 308 male broiler chickens were fed one of four diets containing 0, 10, 30 or 50 g of Corynebacterium ammoniagenes-derived single cell protein (SCP) per kg for 35 days to investigate the effect of graded level of SCP on growth performance, organ weights, serum and tibia characteristics, and meat quality. In each treatment were 5 replicates, 30 chickens per replicate. Graded levels of dietary SCP did not affect (P > 0.05; linear or quadratic) daily weight gain of broilers at all ages. However, chickens fed a diet containing 10 g SCP · kg−1 had higher (P < 0.05) body weight gain in comparison with the control group at days 1–21. Dietary SCP linearly lowered (P < 0.05) feed intake at all ages, but quadratically enhanced feed conversion ratio at days 1–21 as the SCP levels in diets increased. Chickens fed the diet containing 10 g SCP · kg−1 consumed more (P < 0.05) at days 22–35 and 1–35 as compared with the control group. Dietary SCP did not affect (P > 0.05) the relative weights of various organs, serum and tibia characteristics, and meat quality parameters. In conclusion, the obtained results suggest that C. ammoniagenes-derived SCP can be added at the level of 1% to broiler diet as a non-conventional protein source without any negative effects on blood and bone characteristics, and meat quality. Received: 19 March 2017 Revised: 29 April 2018 Accepted: 8 June 2018

journal of animal and feed sciences

Effects of dietary &lt;i&gt;Corynebacterium ammoniagenes&lt;/i&gt;-derived single cell protein on growth performance, blood and tibia bone characteristics, and meat quality of broiler chickens