[Effect of population density on the raising of broiler chickens]

Experiments were carried out to study the influence of density in industrial broiler-raising. They took place during different seasons of the year and with a different density of habitation (12, 14, 16, 18, 20 and 22 pieces on m2) and through an optimization of technological indices in broiler-raising. The dynamism of microclimatic indices was traced out (temperature, humidity, gas composition, dust and microbe contamination of air in the buildings having a different density of habitation. Hematological and biochemical studies were carried out concerning total protein, protein fractions, contents of hemoglobin and number of erythrocytes, as well as the contents of alkaline reserves of blood. The experiments were also devoted to the growth and development, the consumption of fodder for a single unit of production, the morbidity rate and the death rate with chickens raised in different density. It was proved that the density of habitation exerts an influence over microclimatic indices. If the density is greater the contents of ammonia in the buildings is by 1.5 times over the zoohygienic requirements. Under the influence of the density of habitation certain changes occurred concerning the hematological and biochemical indices of blood. A correlation was observed between the density of habitation and the development of some diseases. Certain changes occurred also in the growth and in the development of broilers. By virtue of the results obtained, suggestions are put forward to optimize the density of habitation in industrial broiler-raising.