Application Of Enzyme Addition In Corn-cottonseed, Rapeseed And Peanutseed Meals Basal Diet To Laying Hens

The study was conducted to evaluated the influence of enzyme mixture(EX) on eggperformance,egg quality and nutrient utilization of layers in corn-,cottonseed , rapeseed andpeanutseed meals basal diets. 720 Nike laying birds were randomly assigned to fivegroups(A-E), each of 4 replicates and 36 birds per replicate. One acted as group A and fedcore-soybean meal basal diet, another four treated groups were fed core-,cottonseed ,rapseedand peanutseed meal basal diet with different level EX.The supplementation levels were0%,0.05%,0.10%和 0.15%,respectively, namely B,C,D and E group. The trial lasted 8weeks.Feed intake(FI),laying rate(LR),average egg weight(AEW), feed/egg,egg specificgravity(ESG),egg-shape index,eggshell thickness and egg yolk colour were determined. Ametabolic trial was carried out at the end of experiment. The whole-faece-collected methodwas used to determing the effect of EX on feed utilization.The apparent utilization of proteinand energy were measured.The results were as follows:1 Effect of EX on production performance Group C, D and E had higher laying rate than group B(p<0.05),and there were nosignificant in contrast with group A.Group D was the best. Average egg weighe(AEW) in group C,D and E have been improved in some content.Group C, D and E increased 0.80%(p>0.05),2.01%(p<0.05).0.62%(p>.05).In contrast withgroup A,there were no significant. Feed/egg in group C, D and E were better than group B. Group C and D had beendecreased, significantly(p<0.05).Group E showed a decreasing tendency(p>.05). Feed intake,Rate of broken and abnorm egg and rate of dirty had no significant amonggroups.Rate of broken-abnorm egg decreased with addition of enzyme .2 Effect of EX on egg quality Egg shape index, egg yolk colour, eggshell thickness and egg specific gravity had nosignificant difference among groups(p>0.05).Group C, D and E had slightly improvement ineggshell thickness than group B .3 Effect of EX on feed utilization The resultsn showed that group C, D and E had better energy utilization ratio(EUR) thangroup B.Group D increased EUR(P<0.01),Group C increased EUR(P<0.05),but Group Ehad an improved tendency(P>.05). Group C, D and E had higher apparent protein digestibility(APE) than group B(P<0.05),and there were no significant in contrast with group A.Group D was the best.