Effect of phytase supplementation on utilization of phosphorus in laying hen diets [electronic resource].
Language: English Summary language: Arabic Description: p.1233-1246Other title:- تأثير أضافة إنزيم الفيتيز علي الاستفادة من الفوسفور في علائق الدجاج البياض [Added title page title]
- Mansoura University journal of agricultural sciences, 2006 v. 31 (3) [electronic resource].
Includes references.
An experiment was conducted to examine the effects of adding microbial phytase enzyme (E) [each gram contains 2500 FTUj at 0.05% of corn-soybean meal diets containing varying available phosphorus (AP) levels on the performance of Sinai laying hens. Six isocaloric-(2700 kcai/kg) isonitrogenous·(16% CP) with 3.3% Ca diets were formulated. Diet 1 contained 0.405% AP (a normal levei) 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 iaying 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 infiuenced 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 iayer 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.
Summary in Arabic.
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