添加木聚糖酶和植酸酶对蛋鸡生产性能和胫骨矿质化的影响

选择28周龄商品代‘罗曼’蛋鸡840只,采用单因子分组试验设计随机分为5组,每组8个重复,每个重复21只鸡,分别接受正对照(Ⅰ)、负对照(Ⅱ)、负对照+植酸酶60g.t-1+木聚糖酶200g.t-1(Ⅲ)、负对照+植酸酶60g.t-1+木聚糖酶350g.t-1(Ⅳ)和负对照+植酸酶60g.t-1+木聚糖酶500g.t-1(Ⅴ)5个试验处理,研究2种酶合用对蛋鸡生产性能及胫骨矿质化的影响.结果表明:与Ⅱ组相比,添加植酸酶与木聚糖酶后使Ⅲ、Ⅳ、Ⅴ组入舍母鸡产蛋率、入舍母鸡产蛋质量和胫骨灰分含量等指标显著提高(P0.05),死淘率和破汤蛋率显著降低(P0.05),耗料量呈下降趋势;各组蛋质量、蛋形指数、哈氏单位、蛋壳强度、蛋壳厚度、单位面积蛋壳质量及蛋壳率等指标都在正常范围;50周龄时Ⅲ组蛋壳强度显著低于Ⅰ组(P0.05),Ⅳ组蛋壳率显著低于Ⅰ组(P0.05),Ⅰ、Ⅱ组蛋壳厚度显示有高于Ⅲ、Ⅳ、Ⅴ的趋势.

Effects of xylanase and phytase supplement on performance and tibia mineralization of layers

The experiment was conducted to investigate the effects of xylanase and phytase on performance and tibia mineralization of layers.A total of 840 28-week-old 'Loman' brown layers were selected and randomly divided into 5 groups with 8 replicates per group and 21 layers per replicate by single factor nested design.Five treatments,positive control(Ⅰ),negative control(Ⅱ),negative + phytase 60 g·t-1 + xylanase 200 g·t-1(Ⅲ),negative control+ phytase 60 g·t-1 + xylanase 350 g·t-1(Ⅳ) and negative control + phytase 60 g·t-1 + xylanse 500 g·t-1(Ⅴ) were carried out.The results revealed that when supplemented with xylanase and phytase,the hen housed egg production rate(%),hen housed egg production weight(kg) and tibia ash ration of Ⅲ,Ⅳ and Ⅴ improved significantly (P<0.05) and mortality and broken and soft eggs decreased significantly compared with Ⅱ(P<0.05),feed intake was lower in treatment Ⅲ,Ⅳ and Ⅴ than that of treatment Ⅱ.All indexes of egg quality were within a normal range.At 50-week-old,the eggshell strength of treatment Ⅲ was significantly lower than that of treatment Ⅰ(P<0.05),the eggshell rate of treatment Ⅳ was significantly lower than that of treatment Ⅰ(P<0.05).The eggshell thickness of treatment Ⅰand Ⅱ were both significantly higher than that of treatment Ⅲ,Ⅳ and Ⅴ.