CALCIUM AND PHOSPHORUS IN THE BODY OF BROILER CHICKENS ON THE BACKGROUND OF HIGH ENERGY DIETS
Being the mineral basis of the body, Ca and P are involved in many biological processes, including the development and mineralization of bones, the metabolism of other elements, blood homeostasis, energy metabolism and acid-base balance, etc. Metabolism of Ca and P is closely related, and therefore the lack of one of them is reflected in productivity. Their deficiency hinders the achievement of maximum productivity during the period of intensive growth. During the experiment, three groups were formed with different content of metabolic energy in the diet (MJ/kg): control - 12.99; experimental I - 13.7; experimental II - 15.0. When evaluating Ca and P in the tissues of the control and experimental groups, it was noted: in the blood serum, there is a significant decrease in Ca in the experimental groups by 1.4% and 9.2%, respectively; in the muscle tissue of I and II experimental groups, Ca decreased by 21.1% (p<0.05) and 24.9% (p<0.05), P values fell by 19.9% and 21.2%; change in bone tissue is accompanied by a tendency to decrease Ca and P in the group with the highest metabolic energy (experimental group II) by 16.2% (p<0.05) and 13.4% (p<0.05) relative to control values, and also a significant decrease in bone mass by 0.7% and 6.3% (p<0.05) relative to the control. An increase in the level of fats in the diet of broiler chickens is accompanied by a decrease in Ca and P in the body of the bird, which in turn can lead to metabolic disorders and functional instability of the body.