EFFECTS OF DIFFERENT DIETARY LEVELS OF AVAJLABlE PHOSPHORUS AND MICROBIAL PHYTASE ON THE PRODUCTIVE PERFORMANCE OF MAMOURAH LAYING HENS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 1, Volume 29, Issue 4, April 2004, Page 1665-1676 PDF (748.05 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2004.239144 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| H. A. Abou Khashaba,; M. A. Ibrahim; M. A. M. sayed | ||||
| A.rIimal Production Research lnstttute, Agriculture Research Center, Ministry of Agricul1ure, Ockki, Cairo, Egypt. | ||||
| Abstract | ||||
| A 3 x 3 faclorial experiment was conducted to determine the enects of difierenl available phosphorus (AP) I eveis In cliets of Marnourah laying hens with or without dietary microbial phytase (MP) supplementation on productive performance (egg production rate, egg weight. egg mess and feed conversion), egg quality ( some exterior and interior parameters end Ca and P contents of egg shell ), and some blood constituents (levels of ptasma total protein. albumin and globulin, and activities of the transaminase enzymes: GOT and GPI ). Tibia bona length and wIdth and its content of Ca and P were also determined. Three isccatoric (ME or about 2760 kcat/f:Q)- isonitrogenous (CP of about 16 %) diets, containing AP revels of 0.405, 0.269 or O. t 35 ~~ were formulale<! ....nlh three levels of supplemental MP (0. 500 or 1000 Ulkg die!), All birds had a free access 10 feed and water throughoul the experiment.al ~riod from JO to 50 weeks of age. The obtaioed results can be summarized as (ollows: 1- Regardless of MP supplementation, re<!ucing dietary AP level from D.<lQS 10 0.135% caused a sigf'lificanllncrease in (eed InL:lke wilh concornitanlry less eHicif:nl feed conversion, and signifICant reductions In eggshell weight and lhicknes s. obis bone width, and P content of ~gshell, but Increased the activities ot plasma transarninases ( GOT and GPT ). In addition, egg production of the layers was deaeased: but oct signil1canUy, with reduci"9 dietary AP level. 2· lndependently of the eHect of dietary AP level, the dietary supplernentatoo with MP resulted In significanl improvements in egg production rate. egg weight, egg mass, feed conversion, and eQgshell weight and thickness, as well as significant increases in tibia length and Ca content of the eggshell. Concentrations of total protein. albumin. Ca and P in the plasrna or layers were signlficanlly increased. whereas activities of GOT and GPT were reduced In response 10 dielary MP supplementation. J. There were significant ioreracuons between the eHecls of dielarv liP and supplemental MP levels on most of the estimated parameters. It can be concluded that supplementation of laying hen diets: In particular tnose conraininq low available phosphorus. with microbial pbytase at a supplementary level of 500 U/kg diet. may improve the performance of laying hens lor egg production and leed convsrslon. with no detrimental eHect on egg Quality. | ||||
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