The effect of crude glycerin in broiler rations on performance, excreta moisture, footpad dermatitis, blood parameters, ileum histopathology and intestinal microbiology

Alternatives to corn, the primary energy source in poultry farming, are being sought. The aim of this study was to determine the effects in broiler diets of crude glycerin, considered an alternative energy source, on performance, footpad dermatitis, blood parameters, intestinal histopathology and microbiology, and to evaluate its use as a substitute for corn. The study included seven groups: one control group and six treatment groups. Different amounts of crude glycerin were added to the diets of these groups for different durations. The rations were isonitrogenic and isocaloric. Feed intakes were increased over 11-21 and 5-21 days with 10% crude glycerin (P<0.05). In all periods, 5% crude glycerin con- sumption resulted in higher body weight gain (P<0.05) compared to 0% crude glycerin consumption. Feed conversion ratios were better with 5%, and 10% crude glycerin for 5-10 and 5-21 days (P<0.05). 10% crude glycerin increased excreta moisture, and 5% crude glycerin caused less moist excreta (P<0.05) than in the control group. As consumption increased, serum triglyceride decreased, the footpad dermatitis degree-score-incidence increased (P<0.05). There was an increase in coliform count with an increase in consumption (P<0.05). With increasing consumption, crypt width, villus height, villus surface area, and villus height/crypt depth increased, and crypt depth and villus width decreased (P<0.05). These results show that if the ration is prepared in a balanced way, crude glycerin can be used in broilers diets up to 10% without impairing health and performance.