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Glycerine, a by-product of popular nowadays biodiesel production, is easy available and can possibly be used as a new energy feed ingredient (Koreleski et al., 2011). Currently, in Europe it is produced and consumed about 80% of total global biodiesel production (Pond et al., 2005). Using biodiesel byproducts in poultry feeding could reduce feed costs and consequently enhance profitability. Glycerine or glycerol is an odourless, colourless sweet syrupy liquid. In the living organisms, glycerine is a part of all triglyceride molecules present in animal and plant tissues (Pond et al., 2005). It was discovered almost 250 years ago as a result of simple chemical reaction. Commercially, it is synthetized from propylene or it is obtained during saponification process as a by-product (Morrison, 2000). A huge amount of glycerine is produced mainly in USA and Europe. It is widely used in food, cosmetic, pharmaceutical and others industries. In the past, glycerine was used to treat ketosis in animals (Johnson, 1954). ABSTRACT. The aim of the study was to evaluate the effect of dietary inclusion of crude glycerine on growth performance, carcass traits, body measurements and blood cholesterol level of growing Japanese quails. In total 375 one-dayold Japanese quails were randomly divided into five equal groups under complete randomized design. Experimental groups were as follows: T1: basal diet (without glycerine addition), T2: basal diet + 2.5% glycerine, T3: basal diet + 5% glycerine, T4: basal diet + 7.5% glycerine, and T5: basal diet + 10% glycerine. Each treatment was replicated 5 times, 15 birds in each replicate. It was observed that glycerine supplementation did not significantly (P > 0.05) affect the feed intake and body weight of birds. Dietary inclusion of glycerine at a dose of 2.5 and 5% had positive impact on feed conversion ratio (quadratic, P = 0.021) in comparison to control group. Glycerine inclusion in the diet did not affect total blood cholesterol level. Furthermore, neither carcass traits nor body measurements were statistically influenced by the different inclusion levels of glycerine. So, it could be stated that in order to obtain positive effects on quail growth performance, crude glycerine could be used in diets as a source of energy at levels of 2.5 and 5%. Received: 2 September 2016 Revised: 31 January 2017 Accepted: 8 March 2017

Impact of increasing crude glycerine levels in diet on growth, carcass traits, body measurements and blood cholesterol in growing Japanese quails