Abstract
Investigations were carried out to assess the effect of lighting program and energy levels in the diet on carcass characteristics of broilers. The experiment was performed on chickens Cobb 500 hybrids for up to 42 days. The setting was reflected by the principle of two factorial experiments (2x2) at the 40 broiler carcasses of both sexes (10 per replications). The first factor was the lighting program where a group represented by the application of broiler chickens lighting 23L: 1D and group B of the regime 1. wk - 23L: 1D; 2. wk - 12L: 12D, 3. wk -14L: 10D; 4. wk - 16L: 8D; 5.wk -18L: 6D, 6. wk -20L: 4D. Another factor was the energy level where meals are in the "A" group were carcasses of broiler chickens fed diets with standard protein and energy in group "B" were the carcasses of chickens fed diets with high energy content to 0.40 ME MJ / kg compared the standard mixtures. Tests have shown that a lighting program and energy level as factors have no significant effect on carcass yield of broiler chickens, but significant differences (p <0.05) emerged as the interaction Axb and Bxa combinations of the parameters "ready to roast" and "ready to grill". The amount of abdominal fat was significantly higher (p <0.05) in group A and Axb combination compared to Bxa and Bxb. Share weight edible offal expressed as % of "carcass cut classic" was significantly higher (p <0.05) in group B. The combination of Axb had a significantly lower proportion of edible offal compared to the combination of Bxa.
Highlights
Broiler chickens are usually grown on a continuous or nearly continuous program of lighting (23 L: 1 D) in order to increase food intake and their growth (Kampo and Davila, 2002)
Analysis of carcass yield (Table 1) shows that there were statistically significant differences among all treatments and interaction treatment of processing the bodies (KO, SP and SR), which is due to different average body weight of broiler chickens selected sacrificed
This is an indicator that the lighting program and energy content in the diet of chickens factors that significantly affected (P
Summary
Broiler chickens are usually grown on a continuous or nearly continuous program of lighting (23 L: 1 D) in order to increase food intake and their growth (Kampo and Davila, 2002). The downside of this is the accumulation of fat in the carcasses, higher incidence of metabolic disorders, and increased occurrence of skeletal deformities (Kristensen et al, 2006; Olanrewaju et al 2006; Onbasilar et al, 2007; Škrbić et al 2009b, 2012). Testing was done in order to determine the effect of the length of the light period and the level of energy in food to carcass yield, abdominal fat content and edible offal of broiler chickens
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