Effects Of Wheat Bran Levels And Phytase On Performance And Nutrients Metabolism In Laying Hens

An 12-week experiment was conducted to study effects of wheat bran levels and phytaseon productive performance, metabolism of main nutrients and serum parameters in layinghens. 375 brown shell Lomman laying hens aged 32wks were distributed randomly to fivegroups with five replicates and fifteen per replicate. Five diet treatments were designed asfollows: treatments A,B and C contained 0.35% available phosphorus(AP) and 0% ,5% and10% the wheat bran level was, respectively, treatment D contained 10% wheat bran and0.28%AP, and treatment E with 10%wheat bran and 500IU/kg microbial phytase whichsubstituted 0.12% AP,he total AP level of diet was 0.28%. All diets contained the equal levelof apparent metabolic energy, protein, calcium and main essential amino acids. Experimentresults showed that: 1. The egg mass and ratio of egg weight to feed intake were significantly greater for henssupplemented with 5% and 10% wheat bran than for hens fed no wheat bran diet at0.35%AP(P<0.05).As the wheat bran adding level increased, the egg production and eggweight intended to increase(P>0.05). Hens fed the diet contained 10% wheat bran had the bestproductive performance . 2.Egg mass of treatment D was significantly lower than that of treatment C, and the eggproduction intended to decrease in treatment D. Compared with treatment D, treatment Eintended to enhance the productive performance. 3.There was no significant differences in feed intake, eggshell quality and fecal moistureamong all the treatments. 4.Compared with treatment A, the apparent metabolic rate of total phosphorus(TP) andcrude protein(CP) in treatment B and C were increased by 9.9%(P>0.05),18.4%(P<0.05)and 4.56%(P>.05),9.03%(P<0.05),respectively. There were no significant difference inthe apparent metabolic rate of TP and CP between treatment C and D. The apparent metabolicrate of TP of treatment E was higher extremely than treatment D(P<0.01)and the apparentmetabolic rate of CP was increased in treatment E(P>0.05). There was no significantdifference in the apparent metabolic rate of Ca, dry material(DM)and general energy(GE)among all the treatments. 5．Compared with treatment A, the phosphorus( P ) content in serum in treatment B andC were increased by 5.2%(P>0.05)and 9.3%(P<0.05),respectively. The P content in serumin Treatment D decreased by 7.9%(P<0.05)compared with treatment C. The P content inserum in treatment E was higher than that in treatment C(P>0.05). There was no significantdifferences in the alkaline phosphatase(AKP) activity and Ca content in serum among all thetreatments.