Abstract
In order to determine the effect of intensity of light and stocking density, as well as the interaction of light intensity x stocking density on body weight and individual carcass traits, an experiment was performed on 1200 broilers of the Ross 308 genotype. The investigated factors were the intensity of light (LI): 20 lx (K) ; 150 lx (O) and stocking density (SD): 10 broilers/m2 (A); 13 broilers/m2 (B); 15 broilers/m2 (C), in 4 repetitions. The light source was incandescent bulbs of adequate intensity and a light program 16L: 4D: 2L: 2D was applied. Broiler body weight was controlled on 11th, 21st, 35th and 42nd day, by individual measurement of all chickens in the trial. The average sample containing 12 chickens per treatment with equal gender representation (total of 72 broilers) was used to study the slaughter quality of carcasses based on the parameters of absolute and relative yield of more valuable carcass parts (breast, thighs and drumsticks) and meat in the more valuable parts of the carcass. The effect of light with different intensity on the body weight differed depending on the broiler rearing phase. The interaction effect of the intensity of light and stocking density on the body weight of broilers was confirmed in all stages of growing up to the age of 42 days. A higher intensity of light (150 lx) showed the potential to alleviate the negative effects of higher stocking density (15 broilers/m2) on the final body weight of the broiler. The carcass traits were not significantly affected by the intensity of the light, while the stocking density, as well as the intensity of the light x stocking density did influence the yield of whole breast and the yield of breast meat.
Highlights
In commercial production conditions, broiler activity has been reduced to a minimum in order to achieve higher growth and more efficient use of food
Broilers in group A had a more intensive gain of body weight compared to groups B and C, which resulted in significantly higher (p
Based on the results of the presented research, it can be concluded that the effect of light of different intensity on the body weight of broilers differed depending on the growing stage
Summary
Broiler activity has been reduced to a minimum in order to achieve higher growth and more efficient use of food. In such conditions, the problem of endangered welfare and health of broilers occurs, and efforts are made to establish the control of their physical activity by certain environmental factors. The environmental factors that exert the effect on the physical activity of broilers are light and stocking density (Estevez, 2007; Kristensen et al, 2006b, Deep et al, 2010b). The use of low-intensity light is based on the effect of reducing the physical activity of broilers (Downs et al, 2006) and the expected benefits in terms of gain and quality of the carcass. According to Alvino et al (2009), the highintensity light is desirable for the expression of certain patterns of behaviour
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