The effectiveness of a phytobiotic and a probiotic in diets for broiler preparental lines selected by the Center for Genetics & Selection "Smena"
The effects of a phytobiotic (FHY) and a probiotic (PRO) in diets for broiler breeders (three preparental lines: B6, fast-feathering B7, slow-feathering B7) on the productive performance, digestibility of dietary nutrients, biochemical and morphological blood indices were studied. It was found that digestibility of dietary crude protein in all FHY treatments was higher by1.21-1.80%, in all PRO treatments by 1.09-1.76% in compare to the respective control treatments (CON) fed diets without the additives; nitrogen retention in these treatments was higher by 1.27-1.67 and 1.13-1.71%, respectively. Availability of lysine and methionine in all FHY and PRO treatments was significantly higher in compare to CON treatments by 0.96-1.94 and 1.71-2.09%, respectively (p<0.01); digestibility of crude fat was 74.03-75.80%, higher by 1.06-2.10% in compare to CON treatments. In B6 line tryptic activity in blood serum in FHY treatment was lower by 38.5% in compare to the respective CON treatment. Activity of alkaline phosphatase in blood serum in all PHY treatments was significantly lower by 13.1-55.7% in compare to the respective CON treatments, concentration of total protein higher by 25.8-33.4%, concentration of triglycerides higher by 32.2-137.5% (p<0.05). In fast-feathering B7 line concentrations of erythrocytes and hemoglobin in PHY treatment were significantly higher in compare to the respective CON treatment by 15.0 and 12.9%, respectively (p<0.05). In all PRO treatments concentrations of total protein and triglycerides in blood serum were significantly higher in compare to the respective CON treatments by 6.9-18.1 and 25.8-162.5%, respectively (p<0.05). The significant differences with CON were found in PRO treatment of slow-feathering B7 line in total concentration of leukocytes and in the percentages of certain leukocytic fractions; concentrations of erythrocytes and hemoglobine in this treatment were significantly higher in compare to CON by 16.7 and 16.1%, respectively, hematocrit higher by 10.2% (p<0.05). The conclusion was made that the changes found in the biochemical and morphological blood indices agreed with the data on growth efficiency and digestibility of dietary nutrients and indicated the optimization of the metabolism in all three preparental lines fed the additives studied.