INFLUENCE OF PHYTASE SUPPLEMENTATION ON PERFORMANCE AND MINERAL RETENTION IN LOW PHOSPHORUS DIET FED IN GIRIRAJA BIRDS
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Date
2017-09
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
The effects of phytase supplementation on growth performance, mineral retention,
bone and blood Minerals content, carcass characteristics and economy in Giriraja birds
were studied from 1 to 42 d of age. Four hundred twenty one-day-old Giriraja chicks
were assigned at random to seven dietary treatments. The basal diet Control (0.45%
available P -T1), Low P diet (0.35% available P -T2), low P diet (0.3% available P -T3),
Low P diet (0.35% available P + Phytase 500 FTU/kg -T4), Low P diet (0.3% available P
+ phytase 500 FTU/ kg-T5), Low P diet (0.35% available P + Phytase 1000 FTU/kg -T6),
Low P diet (0.3% available P + Phytase 1000 FTU/kg -T7) were fed to respective
experimental group of birds. The supplementation of phytase in Giriraja birds diets
improved the body weight gain, feed intake and feed conversion ratio at the end of 42nd d
of age. Phytase enzyme was effective in significantly improving mineral retention
(Calcium and Phosporus). It was also revealed significant (P≤0.05) effect in bone mineral
retention (Ca and P) The blood Calcium was not affected significantly by feeding of
phytase enzyme but had significant effect on blood phosphorus. The phytase based diets
did not show any significant difference in abdominal fat per cent, liver and gizzard
weights. However, there was significant comparable effect on dressing percentage and
heart percentage. There was significant (P≤0.05) difference in economy in control when
compared to experimental groups.