Kassem,, M. (2006). EFFECT OF PHYTASE SUPPLEMENTATION ON UTILIZATION OF PHOSPHORUS IN LAYING HEN DIETS. Journal of Animal and Poultry Production, 31(3), 1233-1246. doi: 10.21608/jappmu.2006.235441
M . G. Kassem,. "EFFECT OF PHYTASE SUPPLEMENTATION ON UTILIZATION OF PHOSPHORUS IN LAYING HEN DIETS". Journal of Animal and Poultry Production, 31, 3, 2006, 1233-1246. doi: 10.21608/jappmu.2006.235441
Kassem,, M. (2006). 'EFFECT OF PHYTASE SUPPLEMENTATION ON UTILIZATION OF PHOSPHORUS IN LAYING HEN DIETS', Journal of Animal and Poultry Production, 31(3), pp. 1233-1246. doi: 10.21608/jappmu.2006.235441
Kassem,, M. EFFECT OF PHYTASE SUPPLEMENTATION ON UTILIZATION OF PHOSPHORUS IN LAYING HEN DIETS. Journal of Animal and Poultry Production, 2006; 31(3): 1233-1246. doi: 10.21608/jappmu.2006.235441
EFFECT OF PHYTASE SUPPLEMENTATION ON UTILIZATION OF PHOSPHORUS IN LAYING HEN DIETS
Anim. Prod. Res. Institute, Agric. Res. Center, Ministry of Agric., Dokki, Giza.
Abstract
An experiment was conducted to examine the effects of adding microbial
phytase enzyme (E) [each gram contains 2500 FTU] at 0.05% of corn-soybean meal
diets containing varying available phosphorus (AP) levels on the performance of Sinai
laying hens. Six isocaloric-(2700 kcalfkg) isonitrogenous—(160/o CP) with 3.3% Ca
diets were formulated. Diet 1 contained 0.405% AP (a normal level) and served as a
negative control (T1). Diet 2 had the same AP level plus E and designated as a
positive control (T2). Whereas, diets 3, 4, 5 and 6 of T3, T4, T5 and T6 contained
0.334, 0.262, 0.190 and 0.119% AP, respectively, plus E. Each diet was fed to six
replicates of 5 birds each from 32 to 52 weeks of age.
No significant differences were observed among dietary treatments in the
performance of Sinai laying hens foe egg production, egg weight, egg mass, feed
intake and feed conversion, with the exception of those of T6 which gave a
significantly lower egg weight. As for reproductive performance; egg fertility,
hatchability, and embryonic mortality were not affected by the dietary treatments.
Neither exterior nor interior egg quality traits were influenced by the dietary
treatments, as measured at 36, 40 or 44 weeks of age. No significant differences were
detected among the dietary treatments in blood constituents of 52-wk-old Sinai
laying hens; as assessed by the concentration of plasma total protein, total lipids,
cholesterol, Ca and P. in addition, dietary treatments had no effect on carcass traits
of these experimental birds. Economically, T2, T4, T5 and T6 exhibited a higher
economic efficiency, but T6 had the advantage over all dietary treatments.
It would be concluded that Sinai laying hens can be fed on a layer diet
containing as low available phosphorous level as 0.119% plus 0.05% Exogenous
supplemental phytase without any adverse effect on their productive and
reproductive performance.
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