Infl uence of phytobiotic feed additive on nutrients digestibility of diet in broiler chickens

Inclusion of chicory decoction in the diet of broiler chickens at a dosage of 35 mg, 70 and 105 mg/kg of live weight during the entire period of poultry rearing showed that the best results in live weight at the age of 38 days were shown by broilers with the addition of a medium dosage of phytobiotic (70 mg/kg). In terms of absolute live weight gain, they exceeded the control group by 6.4 %, while in the group with a low rate of introduction of the studied additive it was at the level of the control group, and with a high rate it was higher by 3.6 %. A study of the digestibility of nutrients in the poultry diet depending on age showed that the group with a medium dosage of chicory decoction had the best indicators. Thus, at the age of 3 weeks, broilers of the 2nd experimental group had higher digestibility of crude protein by 3.81 abs.%, crude fat by 7.93 abs.%, crude fi ber by 7.03 abs.%, at the age of 5 weeks, respectively, by 4.27 abs.%, 2.92 and 2.49 abs.%. At the same time, nitrogen deposition in the body of broiler chickens exceeded the control group by 0.38 and 0.52 g, which increased its use, both from the accepted and from the digested amount. The study of broiler blood at the fi nal stage of rearing confi rmed the results of the metabolism experiment and showed that the average dosage of phytobiotic stimulates protein metabolism in the broilers’ body, better use of phosphorus for energy purposes, and reduces the excretion of nitrogen with uric acid. Positive changes in the body of broilers with the addition of the phytobiotic at an average dosage reduced protein costs per unit of live weight gain by 6.4 % compared to the control group, while in the group with low and high input rate the differences were 1.5 and 3.7 %.