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Nowadays, great social and environmental pressure is being exerted to reduce environmental pollution resulting from the production of agroindustrial by-products, and so countries are trying to adapt to this challenge by reutilizing them as animal feed (Tufarelli et al., 2013). Waste disposal and by-product management in food processing industry pose problems in the areas of environmental protection and sustainability (Russ and MeyerPittroff, 2004). Vinasse (condensed molasses solubles, CMS) is an agro-industrial by-product of alcohol, citric acid, yeasts, monosodium glutamate and ephedrine production by fermentation of molasses (Karalazos and Swan, 1977; Stemme et al., 2005; LópezCampos et al., 2011). In the ethanol production ABSTRACT. Thirty-two goat male kids (body weight 20 ± 2 kg; age ~5–6 months) were used to examine the effects of vinasse supplementation on growth, carcass characteristics, and blood and ruminal parameters in a completely randomized design. Kids were randomly divided into four groups: control diet without vinasse (T1) and diets containing 4 (T2), 8 (T3) and 12% (T4) of vinasse on dry matter (DM) basis. Dry matter intake (DMI) was recorded daily and animals were weighed every 21 days during the 90-day experimental period. Vinasse supplementation had no significant effect on DMI (P = 0.21), average daily gain (P = 0.61) and feed conversion ratio (P = 0.79). Adding vinasse to diets at high levels (T3 and T4) enhanced rumen pH (P = 0.03); however, it had no effect on rumen ammonia nitrogen (P = 0.62) and volatile fatty acids concentration. Plasma metabolites concentrations were not affected by treatments except the magnesium level which increased in line with the level of vinasse (P = 0.03). Vinasse supplementation induced significant reduction of the internal fat weight in the T3 and T4 groups (P = 0.02), whereas hot carcass weight (P = 0.75), carcass yield (P = 0.81), longissimus muscle (LM) area (P = 0.97), backfat thickness (P = 0.68) and LM chemical composition (crude protein (P = 0.18), ether extract (P = 0.93) and ash percent (P = 0.21)) were not affected. The obtained results may suggest that vinasse can be added into the goat kids diet up to 12% without any adverse effects on performance but with the potential to reduce the internal fat content. Received: 3 September 2018 Revised: 20 July 2019 Accepted: 21 November 2019

journal of animal and feed sciences

Effect of vinasse (condensed molasses solubles) on performance, blood metabolites, ruminal parameters and carcass characteristics of Mahabadi goat male kids