The Effects of Diets Supplemented with Phytase on the Productive Performance, Biochemical and Morphological Blood Indices in Broilers and Layers of Broiler Preparental Lines

The effects of exogenous phytase in the vegetable diets on the productive performance, digestion, blood indices were studied on broilers (100 ppm, 35 birds per treatment, 1-35 days of age) and layers of three broiler preparental lines (B6, Cornish breed, B7 and B8, Plymouth Rock breed; 50 ppm, 25 birds per treatment, 21-62 weeks of age). In broilers increase in average daily weight gains by 5.7%, decrease in feed conversion ratio by 7.74%, significantly higher digestibility of crude protein by 2.23% (P<0.05), crude fat by 1.94% (P<0.001), nitrogen retention by 1.99% (P<0.01), phosphorus availability by 7.98% (P<0.001) in compare to control was found. The improvement of bone mineralization was also found. The activization of metabolism was evidenced by the significant increases (P<0.05) in concentrations of RBC (by 10.7% in compare to control) and hemoglobin (by 14.6%), and in hematocrit (by 10.5%). In layers slight increases in egg production and significant improvements in eggshell thickness and elastic deformation in all lines in compare to non-supplemented control treatments were found. Phytase was found to significantly (P<0.05) increase concentration of total protein in blood serum, decrease activity of ALP and diversely alter concentrations of glucose and total cholesterol. The changes in morphological blood profiles in certain treatments included increases in the percentages of neutrophils and basophils and decrease in the percentage of monocytes; as a result the general index of immune reactivity was higher in phytase-supplemented treatments in compare to control treatments in B6 and B7 lines while lower in B8 line.