摘要
为探讨饲粮中不同浒苔水平对肉鸡养分利用率和消化酶活性的影响,试验选用1日龄健康艾维茵肉鸡240只,随机分为4组,每组6个重复,每个重复10只鸡。Ⅰ组为不添加浒苔的对照组,Ⅱ、Ⅲ、Ⅳ组浒苔添加量分别为2%、3%、4%,各组饲粮营养水平除代谢能有微小差异外均完全一致。试验期42 d。于22～28日龄进行浒苔和饲粮养分表观利用率的测定,于42日龄进行肉鸡胃肠道消化酶活性的测定。结果表明:1)肉鸡对浒苔中干物质、有机物、粗蛋白质的表观利用率分别为73.90%、77.53%、64.37%,表观代谢能为8.49 MJ/kg DM,各种氨基酸的表观利用率保持在79.10%～87.59%,平均为84.45%。2)2%、3%的浒苔添加量可显著或极显著提高肉鸡对干物质、能量、有机物、粗蛋白质和多种氨基酸的表观利用率(P<0.05或P<0.01),3%水平下各养分的表观利用率均最高,在常规养分中浒苔对粗蛋白质的表观利用率的改善作用最为明显。3)3%、4%浒苔添加量可显著或极显著增强腺胃中胃蛋白酶,胰腺、十二指肠、空肠中胰蛋白酶和胰腺中淀粉酶的活性(P<0.05或P<0.01),对脂肪酶活性的影响均不显著(P>0.05)。由此可知,浒苔中主要养分的表观利用率高,氨基酸组成合理,能够提高肉鸡对饲粮养分的表观利用率,增强相关胃肠道组织的消化酶活性,是一种优良的海藻饲料资源。本试验条件下,肉鸡饲粮中浒苔添加量以3%效果最好。
In order to study the effects of Enteromorpha prolifera on nutrient availability and digestive enzyme activities of broiler chickens,two hundred and forty healthy one-day-old Avian broiler chickens were randomly divided into four groups with six replicates in each group and ten chickens in each replicate.Group Ⅰ（control group） was fed with the diet without Enteromorpha prolifera.Groups Ⅱ,Ⅲ and Ⅳ were fed with the diets with 2%,3% and 4% Enteromorpha prolifera,respectively,and the nutrient levels of each group were exactly the same except that metabolizable energy was similar.The feeding test lasted for 42 days.At 22 to 28 days of age,apparent nutrient availability of Enteromorpha prolifera and diets were analyzed;and digestive enzyme activities in the gastrointestinal tract of broiler chickens at 42 days of age were measured.The results showed as follows： 1） apparent availability of dry matter,organism matter,and crude protein of Enteromorpha prolifera was 73.90%,77.53%,and 64.37%,respectively,and apparent metabolizable energy was 8.49 MJ/kg DM;apparent availability of amino acids was 79.10% to 87.59%,and 84.45% on average;2） compared with the control group,2% and 3% Enteromorpha prolifera significantly increased the apparent availability of dry matter,energy,organism matter,crude protein and many kinds of amino acids of the diets（P0.05 or P0.01）;3% Enteromorpha prolifera had the best effect,and apparent availability of crude protein had the highest improvement among general nutrients;3） 3% and 4% Enteromorpha prolifera significantly enhanced the activities of pepsin in proventriculus,trypsase in pancreas,duodenum and jejunum,and amylase in pancreas,respectively（P0.05 or P0.01）;but they had no significant effect on lipase activities（P0.05）.In conclusion,Enteromorpha prolifera has high nutrient availability and rational composition of amino acids,and can increase apparent availability of diets and digestive enzyme activities in the gastrointestinal tract of broiler chickens,so it is
出处
《动物营养学报》
CAS
CSCD
北大核心
2010年第6期1658-1664,共7页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
国家科技支撑计划项目(2008BAC49B04)
青岛市科技项目(08-1-7-5-hy)
关键词
浒苔
肉鸡
表观利用率
消化酶
Enteromorpha prolifera
broiler chickens
apparent availability
digestive enzyme
