混和酶制剂对丝毛乌骨鸡生长速度和饲料利用及养分消化率的影响

Effects of mixed enzyme preparations on growth rate,feed conversion and nutrients digestibility of Gallus gallus domesticus brisson .

取２００羽１日龄丝毛乌骨鸡［始重（２４．７５±２．６６）ｇ］，随机分成试验１、２、３、４组和对照组，分别饲喂含中性蛋白酶、糖化酶及不含酶制剂的基础日粮，饲养试验在６０日龄结束．分别在３１日龄和６１日龄开始时对生长性能最佳试验组和对照组的鸡进行消化试验，并测定血液生化指标．结果表明：①日粮中添加混和酶制剂能提高日增重、降低料重比，其中以试验２组最佳，３０日龄时平均日增重提高２５．２８％（Ｐ＜０．０１），料重比降低１５．９２％．６０日龄时平均日增重提高８．５４％（Ｐ＜０．０５），料重比下降１０．７３％；②使用混合酶制剂可不同程度地提高饲料养分的表观消化率，试验２组鸡３７、６７日龄的干物质、粗蛋白、粗脂肪、无氮浸出物消化率分别提高了３．０５％（Ｐ＜０．０１）、７．２４％（Ｐ＜０．０５），７．６８％（Ｐ＜０．０５）、９．８２％（Ｐ＜０．０５），１２．７０％（Ｐ＜０．０１）、１３．９４％（Ｐ＜０．０１），５．４７％（Ｐ＜０．０１）、６．９０％（Ｐ＜０．０５）；③混合酶制剂对３７日龄和６７日龄丝毛乌骨鸡血糖、血清总蛋白无显著影响．

one day old chickens (24 75±2 66) g were divided into five groups (40each) at random, offered ad lib basal diet supplemented with neutralproteinase、glucoamylase in group 1,2,3,4, respectively, and without supplement basal diet in group5 (control) The chickens were weighted at 30 days and 60 days old, and slaughtered at the end of the digestion trial of the best performance group and the control group The results showed that mixed enzyme preparations improved average daily gain (ADG) and decreased feed gain ratio (F/G) Among the different levels, the level of group 2 was best , which increased ADG 25 28% ( P <0 01)、8 54% ( P <0 05) and decreased F/G 15 92%、10 73% at 30 and 60 days, respectively It also increased the apparent digestibility of dry matter , crude protein, crude fat and nitrogen free extract, at 37 days and 67 days old , by 3 65%( P <0 01)、7 24%( P <0 05), 7 68%( P <0 05)、9 82%( P <0 05),12 70%( P <0 01)、13 94%( P <0 01), 5 47%( P <0 01)、6 90%( P <0 05), respectively Mean while, it had no significant effect on serum glucose and serum total protein of the chickens