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20211
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Subject: Poultry Science × Author: SREEDHARA, J. N. × End date: 2021 × Start date: 2020 × Type: Thesis × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    EFFECT OF PHYTASE SUPPLEMENTATION ON THE PERFORMANCE OF SWARNADHARA BREEDERS FED LOW NON-PHYTATE PHOSPHORUS DIET
    (VETERINARY COLLEGE, HEBBAL, BANGALORE KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR-585401, 2021-01) SREEDHARA, J. N.; AYANAIK
    Two biological trials were conducted to evaluate the effect of phytase supplementation on growth performance, fertility, hatchability, egg quality parameters, phosphorus retention in Swarnadhara breeders reared from 29th to 48th week and progeny performance up to 6 week. Both trials had 5 treatments with 450 birds (90 birds per treatment) in the trial I and 500 birds (100 birds per treatment) in the trial II. Control diet was formulated according to ICAR (2013) nutrient requirements and the group T2 to T5 had available phosphorus levels viz.,0.12 % in T2, 0.18 % in T3, 0.12 % with 500 IU/kg phytase in T4 and 0.18 % with 500 IU/kg phytase in T5. Weight gain, hen day egg production, shape index, albumen index, yolk index, Haugh unit score, fertility, hatchability, serum calcium and phosphorus, survivability and feed cost per egg produced were not significantly (P>0.05) affected by phytase supplementation. Egg weight was significantly (P <0.05) higher in phase I, III and IV in phytase supplemented groups. Phytase supplementation significantly (P <0.05) reduced nitrogen, calcium and phosphorus (P) excretion and increased (P<0.05) retention of the same and also improved the bone phosphorus per cent in T4 and T5. Shell weight was significantly (P<0.05) higher in phytase supplemented groups compared to control in Phase III and IV. Similarly, shell thickness was higher (P<0.05) in phytase supplemented groups compared to control during Phase IV. Cumulative body weight in Swarnadhara chicks in trial II were significantly (P <0.05) higher during week V and VI and survivability in progeny was not significant. However, antibody titre against NDV in progeny was significantly (P <0.05) higher in T5 and lowest in control group. Phytase supplementation improved the shell thickness, shell weight, bone phosphorus, nutrient availability and significantly reduced P excretion in Swarnadhara breeders and improved their progeny performance. Phytase supplementation can reduce the NPP level (0.12 %) in the diet without affecting the egg production and egg quality. Available P level of 0.12 % with phytase is optimum for Swarnadhara breeders to maintain egg production and egg quality.