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The efficiency of new dietary protein additives based on the wastes and by-products of the slaughter and primary processing of poultry was studied on four treatments of broilers (cross “Smena-8”, 1-38 days of age; 3 replicates per treatment, 35 birds per replicate) reared in similar conditions of management and nutrition. Control treatment 1 was fed vegetable diets without animal-derived ingredients; control treatment 2 was fed diets supplemented with fishmeal; in diets for treatments 3 and 4 fishmeal was substituted by two new protein additives produced by the fermentation of the preliminary hydrolyzed slaughter wastes (feathers, intestines, blood, meat-bone residues, etc.) by proteolytic enzymes in different conditions (2 hours at 55°C for treatment 3; 1.5 minutes at 160°C for treatment 4). The best productive performance in broilers was found in treatment 3: average live bodyweight at 38 days of age in this treatment was significantly higher by 8.47% in compare to control and by 4.57% in compare to treatment 2 (p≤0.05); feed conversion ratio was lower by 2.96 and 1.80%, respectively. In treatment 4 these parameters were slightly worse in compare to treatment 3 though better than in treatments 1 and 2. Treatments 3 and 4 also featured higher meat yield and better sensory characteristics of cooked meat and broth.

The productive performance in broilers fed diets supplemented with new animal-derived protein additives