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1.
木聚糖酶对肉中鸭生产性能及效益的影响   总被引：1，自引：0，他引：1  
试验选择12日龄奥白星肉中鸭360只,研究在小麦-豆粕型日粮中添加木聚糖酶(小麦酶制剂)对其生产性能的影响。试验采用单因素完全随机试验设计,将试验动物分成3组,即小麦-豆粕型饲粮组(负对照)、小麦-豆粕型加木聚糖酶组(负对照+酶)和玉米-豆粕型饲粮组(正对照),每处理组3个重复,每个重复40只,结果表明:饲粮中添加0.015%酶制剂组比小麦-豆粕型饲粮组日增重提高5.48%(P<0.05),同时,料肉比明显著降低(P<0.05),增重饲料成本降低了8.72%,差异显著(P<0.05);与玉米-豆粕型饲粮的处理相比日增重、日采食量、料肉比和增重饲料成本差异均不显著。说明在小麦-豆粕型饲粮中添加木聚糖酶(小麦酶制剂)具有一定的生产实用效果。  相似文献   

2.
试验选取1日龄朝鲜龙城鹌鹑108只,研究小麦-豆粕型基础日粮添加木聚糖酶对鹌鹑生长性能及免疫性能的影响。试验鹌鹑按体重随机分为3个处理组,每个处理设3个重复,每重复12只。第1组设为对照,饲喂玉米-豆粕型基础日粮;第2组饲喂小麦-豆粕型基础日粮;第3组在小麦-豆粕型日粮中添加2000U/kg的木聚糖酶,试验期42d。结果表明:小麦日粮对育雏期(0~21日龄)鹌鹑生长性能无显著影响(P>0.05),但是显著降低育成期(22~42日龄)鹌鹑的体重和日增重(P<0.05)。小麦日粮中添加木聚糖酶2000U/kg,对鹌鹑的生长性能无显著影响(P>0.05)。小麦日粮组的新城疫抗体效价显著低于玉米对照组(P<0.05),但是小麦日粮可以显著提高细胞免疫水平(P<0.05)。添加木聚糖酶对鹌鹑的免疫性能无显著影响(P>0.05)。  相似文献   

3.
试验旨在研究高粱替代玉米日粮添加蛋白酶对肉鸡生长性能、养分利用率、空肠形态和肉质的影响。选取健康、体重一致的AA肉鸡864只,随机分为4组,每组6个重复,每个重复36只。试验设计玉米-豆粕型、玉米-豆粕型+200 mg/kg蛋白酶、高粱-豆粕型及高粱-豆粕型+200 mg/kg蛋白酶4种日粮,试验共进行42日龄。结果显示:日粮添加蛋白酶显著提高22~42日龄和1~42日龄肉鸡日增重(P0.05);日粮添加蛋白酶显著提高19~21日龄和40~42日龄肉鸡的表观代谢能、总能和氮的利用率(P0.05);高粱型日粮有降低肉鸡表观代谢能、总能和氮利用率的趋势。日粮添加蛋白酶显著提高21日龄和42日龄肉鸡空肠绒毛高度、绒毛高度与隐窝深度比(P0.05),同时显著降低42日龄肉鸡隐窝深度(P0.05)。日粮添加蛋白酶显著提高肉鸡胸肌重量,显著降低胸肌滴水损失(P0.05)。结果表明:在本试验条件下,玉米或高粱型日粮添加蛋白酶可以提高22~42日龄和1~42日龄AA肉鸡日增重,改善1~21日龄AA肉鸡表观代谢能、干物质、总能和氮的利用率,提高肉鸡屠体、胸肌重量,降低胸肌滴水损失。  相似文献   

4.
用256头健康的杜×长×大三元肥育阉割公猪(体重55千克左右)为试验对象研究肥育猪日粮中添加非淀粉多糖(NSP)水解酶对其生长性能的影响。试验分为玉米-豆粕型日粮组(A)、玉米-豆粕型日粮加酶组(B)、小麦-豆粕型日粮组(C)和小麦-豆粕型日粮加酶组(D)四个处理。每个处理四个重复,每个重复16头猪。四个处理的配方营养水平符合N R C的要求,且保持一致。结果表明:在玉米-豆粕型日粮中添加酶制剂与未添加组比较日增重增加了3.02%(P<0.05),而料肉比下降3.56%(P<0.05),采食量没有显著差异。小麦-豆粕型日粮中添加木聚糖酶组与未添加组比较采食量没有差异,日增重增加了6.70%(P<0.05),而料肉比下降了4.14%(P<0.05)。从本试验可以看出,无论是玉米-豆粕型日粮还是小麦-豆粕型日粮添加NSP复合水解酶都能不同程度地改善肥育猪生长性能,但在小麦-豆粕型日粮中添加NSP水解酶,肥育猪的生长性能改善更为明显。  相似文献   

5.
为研究用小麦替代玉米并添加重组外源酶对肉鸡生长性能、屠宰性能和肠道发育的影响,将300只8日龄健康AA肉仔鸡随机分成5组,每组6个重复,每重复10只。5个处理组分别为:对照1组(玉米-豆粕型日粮)、处理1组(小麦替代40%玉米+酶制剂)、处理2组(小麦替代60%玉米+酶制剂)、处理3组(小麦替代80%玉米+酶制剂)和对照2组(小麦替代60%玉米)。试验为期5周。结果表明:与对照1组相比,处理1组除42日龄胸肌重外,其他指标均无显著差异(P0.05);处理2组除全期采食量、腿肌重外,其他生长性能和屠宰性能指标均显著下降,42日龄十二指肠相对长度、相对质量、以及回肠和盲肠相对质量分别增加12.12%、16.67%、19.23%和15.00%,添加重组外源酶后分别下降14.05%、19.05%、22.58%和21.74%(P0.05);处理3组各项生长性能和屠宰性能指标较对照1组降低,但优于对照2组。结果提示:在8~42日龄时,以小麦替代40%玉米并添加源于产琥珀酸丝状杆菌的重组1,3-1,4-β-葡聚糖酶和源于真菌Neocallimastix frontalis的重组木聚糖酶饲喂AA肉仔鸡,可以取得同玉米-豆粕型日粮相同的饲喂效果。  相似文献   

6.
本试验研究了小麦型日粮中添加不同酶制剂对黄羽肉鸡生长性能的影响。试验选取3600只快大型1日龄黄羽肉鸡,随机分为6个组,每组6个重复,每个重复100只鸡。试验分为6个组:A组为玉米-豆粕型日粮组(作为正对照组);B组为玉米-小麦-豆粕型日粮组(作为负对照组);C、D、E、F组为在负对照组基础上分别添加250g/t酶制剂产品Ⅰ、Ⅱ、Ⅲ、Ⅳ,试验为期51天,分1-21日龄与22-51日龄两个阶段。试验结果表明:21日龄日增重最小的是负对照组,分别比正对照组、试验C、D、E低4.32%、6.50%、4.62%、2.49%,均差异显著(P0.05),增重最大的为C组。从整个生长期来看,日增重最低的是负对照组,比试验C组低3.05%,差异显著(P0.05)。日增重最高的是C组,但与其他酶制剂添加组的D、E、F组之间无显著性差异(P0.05)。  相似文献   

7.
文章旨在研究玉米-小麦-豆粕型日粮添加木聚糖酶和葡聚糖酶对1～42 d肉鸡生长性能、屠宰性能、胴体成分及血液指标的影响。试验选择健康、体重一致的1日龄Cobb肉仔鸡800只,随机分为2组,每组5个重复,每个重复80只。对照组饲喂玉米-小麦-豆粕型日粮,试验组饲喂基础日粮添加2000 U/g木聚糖酶+800 U/g葡聚糖酶,试验分为3个阶段,1～14 d,15～28 d和29～42 d。与对照组相比,酶制剂组显著提高了28～42 d肉鸡能量和蛋白质利用率(P <0.05),显著降低了平均日采食量、日增重和料重比(P <0.05)。对于试验全期,酶制剂组显著提高了1～42 d肉鸡能量和粗蛋白质利用率(P <0.05),同时显著降低了平均日采食量、日增重和料重比(P <0.05)。酶制剂组较对照组显著提高了肉鸡的屠宰率和腿肌率(P <0.05)。对照组与酶制剂组对肉鸡胴体干物质、脂肪和灰分含量的影响均无显著差异(P> 0.05)。日粮添加复合酶较对照组显著提高了28和42 d肉鸡血液T3的含量(P <0.05),显著降低了42 d肉鸡血液T4的含量(P <0.05),同时酶制剂组较对照组显著提高了42 d肉鸡血液葡萄糖的浓度(P <0.05)。与对照组相比,酶制剂组显著降低了28和42 d肉鸡血液尿酸含量(P <0.05),显著提高了14和42 d肉鸡血液甘油三酯含量(P <0.05)。综上所述,1～42 d肉鸡日粮添加2000 U/g木聚糖酶和800 U/g葡聚糖酶可以显著改善料肉比,提高屠宰性能,可改变血液中甲状腺激素和部分代谢物的浓度,但对胴体成分影响不大。  相似文献   

8.
王琛  贺建华  苗朝华 《饲料工业》2006,27(12):33-35
用960羽1日龄双鬼头肉鸭研究了一种固体发酵复合酶(AllzymeSSF)在玉米-豆粕及玉米-小麦-豆粕型日粮中的应用效果,考察了添加该复合酶对肉鸭屠宰性能、血清生化指标的影响。试验结果表明,不同处理对49日龄肉鸭的半净膛率、全净膛率、腿肌率、胸肌率没有显著影响(P>0.05)。玉米-小麦-豆粕型日粮的屠宰率略高于玉米-豆粕型日粮;玉米-豆粕及玉米-小麦-豆粕型日粮中添加200PU/kgAllzymeSSF降低了腹脂率(P<0.05);玉米-豆粕型日粮中添加300PU/kgAllzymeSSF及玉米-小麦-豆粕型日粮中添加200PU/kgAllzymeSSF提高了血清磷的含量(P<0.05);玉米-小麦-豆粕型日粮中添加200PU/kgAllzymeSSF提高了血清球蛋白的含量(P<0.05)。  相似文献   

9.
试验采用单因素完全随机分组设计，选取800只1日龄罗斯308白羽肉鸡，随机分为4组，每组4个重复，每个重复50羽鸡。对照组饲喂不加酶制剂的玉米-豆粕型基础日粮，试验2～4组分别在基础日粮基础上分别添加250、350、500 g/t脂肪酶。试验期为42 d，分1～21日龄和22～42日龄两个阶段。结果表明：（1）玉米-豆粕型日粮中添加脂肪酶可改善肉鸡的生长性能；（2）脂肪酶添加水平为350 g/t可显著提高1～21日龄白羽鸡饲料转化率（P＜0.05）和22～42日龄白羽鸡平均日增重、饲料转化率（P＜0.05）；（3）饲料中添加350 g/t脂肪酶能显著提高脂肪、磷和干物质的表观利用率（P＜0.05）；（4）添加脂肪酶蛋白质表观利用率有提高的趋势（0.05＜P＜0.10），钙的表观利用率显著降低（P＜0.05）。由此可见，肉鸡玉米-豆粕型日粮中脂肪酶添加水平为350 g/t时效果最佳。  相似文献   

10.
本试验旨在研究在玉米-豆粕型日粮和小麦-豆粕型日粮中添加非淀粉多糖(NSP)酶对断奶仔猪肠道食糜黏度、挥发性脂肪酸及肠道形态的影响。选用128头健康的杜×长×大三元杂交断奶仔猪,按性别、体重分为4个处理,即以玉米为基础日粮组(试验1组),玉米为基础日粮降低能量加酶组(试验2组)、小麦为基础日粮组(试验3组)及小麦为基础日粮加酶组(试验4组)。每组4个重复,每个重复8头猪。结果表明:玉米-豆粕型日粮加酶对空肠和回肠食糜黏度没有影响,但有降低趋势;小麦-豆粕型日粮添加NSP酶显著降低了空肠食糜黏度(P<0.05);2种日粮加酶均增加回肠和盲肠挥发性脂肪酸的浓度,提高十二指肠、空肠前段及空肠后段绒毛的高度(P<0.01)。结果提示,2种日粮中添加NSP酶,不同程度的降低肠道食糜黏度、增加回肠、盲肠挥发性脂肪酸(VFA)浓度并改善肠道形态。  相似文献   

11.
1. Two experiments were conducted to study the effects of crude enzyme preparations (beta-glucanase and arabinoxylanase) and/or 20 g/kg Sepiolite (Exal) on the performance and nutrient digestion of broiler chickens fed on maize-barley-wheat based diets. 2. In experiment 1, enzymes improved daily bodyweight gain (by 14%; P<0.001) and food:gain ratios (8%; P<0.001). Sepiolite improved bodyweight gain on the diets not supplemented simultaneously with enzymes (by 6% in 21-d-old chickens, P<0.05) but reduced it for enzymes-supplemeented diets. Changes in productive perfiormance with both additives were associated with changes in diet digestibility and nitrogen balance. 3. In experiment 2, enzyme supplementation reduced viscosity in jejunum and ileum and the mean retention time of digesta in the gut. Sepiolite inclusion significantly reduced the viscosity of jejunum digesta and modified the retention times of digesta in the gut, depending upon whether enzymes had been added. There was a decreased retention time without enzymes but an increase with enzyme supplementation. 4. Although different mechanisms are presumed for enzymes and sepiolite, both seem to counteract the negative effects of soluble, non-starch polysaccharides (NSP) in the diet by modifying jejunal viscosity and improving organic matter digestibility.  相似文献   

12.
本文用１８０只肉仔鸡,进行饲养试验,研究黑麦日粮添加４种不同酶制剂,ＮＱ、ＲＭ１、ＲＭ２和ＲＭ３,对肉仔鸡的生产性能以及肠道食糜及泄殖腔粪样粘度的影响。酶制剂ＮＱ和ＲＭ１含有高的木聚糖酶活（７７００ＩＵ／ｇ,３４５０ＩＵ／ｇ）能极显著改进（Ｐ＜０．０１）增重（８．４％,１６．０％）和饲料转化率（１５．４％,１４．４％）,ＲＭ２,含有相对低的木聚糖酶（６０ＩＵ／ｇ）和相对高的阿拉伯呋喃糖苷酶活（５．３ＩＵ／ｇ）,产生类似的效果（Ｐ＜０．０１）：增重提高１０．５％,饲料转化率提高１１．８％,然而ＲＭ３,由于含木聚糖酶活较低（５ＩＵ／ｇ）和较高的蛋白酶活（８０ＩＵ／ｇ）,则对增重无效,但亦可改善饲料转化率（６．４％,Ｐ＜０．０５）。上述酶制剂在降低肠道食糜和泄殖腔粪样粘度方面与增重和饲料转化率有相同的趋势。一般说来,日粮中添加的酶量与食糜相应的粘度成倒数关系。这些结果证明：具有较高木聚糖酶活的酶制剂能明显降低肠道食糜和泄殖腔粪样的粘度,从而改善饲喂黑麦日粮肉仔鸡的生产性能。  相似文献   

13.
Two experiments were conducted to investigate the effects of a combined α-galactosidase and xylanase preparation on nutrients digestibility and growth performance in broiler chickens. Experiment 1 had 240 broilers allocated to 3 treatments with the dietary supplementation of 0, 300, and 500 g/t of the enzyme combination. Diet and amino acid (AA) digestibility were assessed. Experiment 2 was a 2 × 3 (enzyme × diet) factorial arrangement with 10 replicates of 12 male broilers per replicate. Diets were based on corn–soybean meal (SBM) diet and had 3 nutritional levels (normal, 2% apparent metabolizable energy (AME) and crude protein (CP) reduction, and 4% AME and CP reduction). Each of these diets was fed with or without enzyme supplementation. Growth performance, chyme viscosity, nutrients digestibility, and endogenous enzymes activity were assessed. In experiment 1, enzyme supplementation improved the digestibility of Ca (P = 0.025) and ileal digestibility of total AA, Pro, Alu, Ile, Lys, His, Thr, Glu, Val, Leu, Tyr, and Phe (P < 0.05), and also tended to increase the AME of diets (P < 0.10). In experiment 2, broilers fed the corn–SBM diet with 4% nutrient reduction had better growth performance (P < 0.05), jejunal digesta viscosity at 42 d (P < 0.01), and lower digestibility of gross energy (GE; P < 0.05) when compared with those fed the normal nutrient diet. Enzyme inclusion increased digestibility of CP (P = 0.044), GE (P = 0.009), raffinose (P < 0.001) and stachyose (P < 0.001), improved average daily gain (P = 0.031), and reduced jejunal digesta viscosity at 42 d (P = 0.011). Besides, similar improvements trend in amylase, trypsin, sucrase, and maltase activity with enzyme inclusion were observed as with energy. These data support that the enzyme supplementation increased nutrients and ileal AA digestibility, improved performance and endogenous enzymes activity.  相似文献   

14.
为研究益生菌与酶制剂对黄羽肉鸡生长性能、养分代谢率和肠黏膜形态的影响,试验选择5日龄体重相近的健康雌性黄羽肉鸡675羽,随机分成5个处理,每个处理5个重复,每个重复27羽,空白Ⅰ组饲喂基础饲粮,Ⅱ、Ⅲ、Ⅳ、Ⅴ组分别饲喂在基础饲粮中添加25 g/t益生菌制剂、150 g/t复合酶制剂、25 g/t益生菌制剂+150 g/t复合酶制剂、300 g/t抗敌素的试验饲粮。饲养试验至53日龄结束。结果表明:饲粮中组合添加益生菌与酶制剂获得了最高的全期平均日增重,且与空白Ⅰ组及抗生素Ⅴ组相比分别提高了4.22%(P<0.05)和2.12%(P>0.05);真代谢能以组合添加Ⅳ组最高,且与空白Ⅰ组及抗生素Ⅴ组相比分别提高了11.29%(P<0.01)和6.89%(P<0.05),酶制剂Ⅲ组粗纤维真代谢率极显著高于Ⅰ、Ⅱ、Ⅴ组(P<0.01),显著高于组合添加Ⅳ组(P<0.05);抗生素、益生菌与酶制剂及两者组合使用都不同程度地促进了十二指肠、空肠和回肠绒毛形态结构的发育。总体上说,益生菌与酶制剂联合使用表现出了一定优势,且具有替代某些抗生素饲料添加剂使用的潜能。  相似文献   

15.
Feeding broilers barley-based diets requires special consideration primarily due to effects on increased digesta viscosity and decreased nutrient digestion. Pelleting and glucanase supplementation are commonly performed prior to feeding broilers barley-based diets; however, the interaction of these practices is complex. The objective of this study was to establish a comprehensive evaluation of glucanase efficacy including: degree of processing, activity postpelleting, broiler performance, and digesta viscosity. Treatments were arranged in a 5 (diet formulation) × 2 (processing) factorial in a randomized complete block design with 8 replications/treatment. The 5 diet formulations consisted of positive control (PC), negative control (NC), glucanase A (GA) 125 or 1,000 β-Glu-U/kg feed, and glucanase B (GB) 1,000 β-Glu-U/kg feed. The PC and NC diets differed in metabolizable energy by 150 kcal/kg and enzymes were added to NC formulations. Diets were either fed as unprocessed mash or ground pellets. Diet formulation × processing did not interact for feed intake (FI), FCR, or total tract viscosity (P > 0.05); however, a trend was observed for ending bird weight, demonstrating that for ground pellets, GA 1,000 β-Glu-U/kg feed was improved relative to NC and similar to PC (P = 0.0903). Benefits associated with GB were not of similar magnitude, perhaps in part due to a 50% decrease in activity postpelleting. In addition, GA benefits were not suggested for unprocessed mash. The main effect processing was significant (P < 0.0001) demonstrating that broilers fed ground pellets resulted in greater pen ending bird weight, FI, and bird live weight gain (LWG) compared to birds fed unprocessed mash diets. Evaluations of glucanase should go beyond in vitro activity and include live bird performance using feed that has undergone pelleting.  相似文献   

16.
ABSTRACT

1. The influence of barley inclusion level and supplementation of a multi-component non-starch polysaccharide degrading enzyme on performance and nutrient utilisation in broilers was investigated. Normal-starch hulled barley was evaluated with five levels of inclusion (0, 141, 283, 424 and 565 g/kg) in a wheat-based diet and two levels of enzyme supplementation (0 and 150 g/tonne of feed; a 5 × 2 factorial arrangement of 10 dietary treatments). All diets were equivalent in metabolisable energy and digestible amino acid contents. A total of 400, one-d old male broilers (five cages/treatment; eight birds/cage) were used in the experiment.

2. Regardless of enzyme supplementation, weight gain (WG) increased up to 283 g/kg of barley and was reduced afterwards (P < 0.01). Increasing levels of barley resulted in greater (P < 0.001) gain per feed (G/F). Enzyme addition increased WG (P < 0.05) and G/F (P < 0.001) at each barley inclusion level.

3. Birds fed diets with 0 and 565 g/kg barley showed the lowest and highest (P < 0.001to 0.05) digestibility for all nutrients measured, respectively. Digestibility of all nutrients was improved by enzyme supplementation at each barley inclusion level (P < 0.05). The nitrogen-corrected apparent metabolisable energy improved with increasing inclusion of barley (P < 0.001) and supplemental enzyme (P < 0.01). Increasing inclusion of barley increased the relative weight of gizzard (P < 0.001) and reduced jejunal digesta viscosity (P < 0.001). Supplemental enzyme (P < 0.001) reduced digesta viscosity.

4. The optimum inclusion level of barley, with respect to growth performance, was 283 g/kg of diet. Increasing barley inclusion improved nutrient and energy utilisation, possibly through lowered digesta viscosity and better function of the gizzard. Feed efficiency and nutrient and energy utilisation can benefit from carbohydrase supplementation in barley-based diets, regardless of barley inclusion level.  相似文献   

17.
This study was conducted to evaluate the effects of thymol + carvacrol as plant essential oils on performance, digesta viscosity and some blood metabolites of broilers fed diets supplemented with carboxy methyl cellulose (CMC) and/or thymol+carvacrol. In a completely randomized design with a 2 × 3 factorial arrangement, two levels of CMC (0% and 2%) and three levels of thymol+carvacrol (0, 100 and 200 mg/kg) were used. Each of the six dietary treatments was fed to five replicate pens of 12 birds each from 0 to 42 days of age. Body weight gain (BWG), feed intake, feed conversion ratio (FCR), intestinal digesta viscosity and pH, plasma lipids and some blood metabolites were recorded. The inclusion of 2% CMC decreased (p < 0.05) BWG by 2.2% and increased FCR by 2.3% at 42 days of age. Carboxy methyl cellulose significantly increased the digesta viscosity and decreased serum total cholesterol, but had no significant effect on triglyceride, pH, HDL, LDL and other blood metabolites measured in this experiment. Thymol+carvacrol had no effect on feed intake, but significantly increased (p < 0.05) BWG from 1 to 42 days of age and improved FCR (p < 0.05) by the addition of 100 and 200 mg/kg thymol+carvacrol respectively. Inclusion of thymol+carvacrol at levels of 100 and 200 mg/kg in the diets decreased digesta viscosity and serum total cholesterol (p < 0.05) and also increased AST at a 200 mg/kg thymol+carvacrol without any effect on creatine kinase (CK). Thymol+carvacrol significantly increased total protein (TP), albumin and globulin (p < 0.05). In conclusion, CMC at an inclusion level of 2% of diet increased digesta viscosity and reduced growth performance. However, thymol+carvacrol decreased digesta viscosity and consequently improved the performance of broilers fed the CMC‐based diet. Therefore, thymol+carvacrol addition to viscose‐based diets might be helpful to alleviate the negative effects of viscous compounds in poultry diets.  相似文献   

18.
This study was conducted to determine the influence of exogenous acid protease (EAP) on growth performance, blood profiles, excreta noxious gas emissions, ileum digesta viscosity and apparent ileal digestibility in broilers. A total of 600 1-d-old broilers with average initial body weight of 47.0 ± 0.2 g were used in a 5-week feeding trial. The broilers were randomly allotted to 1 of 4 treatments with 10 replicate pens per treatment and 15 birds per cage. Dietary treatments consisted of: CON, basal diets; EAP1, CON + 2,700 exogenous acid protease unite (APU)/kg; EAP2, CON + 5,400 APU/kg; EAP3, CON + 8,100 APU/kg. The body weight gain (BWG) had a linear improvement when chicks fed 8,100 AP/kg diets from d 18 to 35 and overall (p < .05). Lower feed conversion ratio (FCR) was obtained in broilers fed 5,400 APU/kg and 8,100 APU/kg as compared with the CON during overall (p < .05). Birds fed diets supplemented with EAP diet led to a linear increase in the ileal digestibility of crude protein, energy and amino acids (lysine, methionine, cystine, threonine, isoleucine, leucine, histidine and tryptophan) compared with CON group (p < .05). In conclusion, based on our results, we suggest that supplementation with EAP diet was effective in improving growth performance through increasing ileal digestibility of some nutrients (crude protein, energy and amino acids) in broilers.  相似文献   

19.
This experiment was conducted to investigate the effects of butyrin on the growth performance,nutrient apparent digestibility,slaughter performance,intestinal morphology and microbial flora of broilers.A total of 384 1-day-old Rose 308 broilers were selected and randomly divided into 4 groups,4 replicates per group and 24 broilers per replicate.The blank control group was fed on basal diet,the experimental groups were fed on basal diet supplemented with 250,500 and 750 g/t butyrin,respectively,which replaced 40% oil of the basal diet.The experiment lasted for 42 days.The result showed that compared with the blank control group,diets supplemented with butyrin had an promoting effect on the performance of broilers,and the middle dose group (500 g/t) was the best.The slaughter performance of supplemented groups showed a tendency to be improved,but there was no significant difference with blank control group (P>0.05);The height of duodenum and jejunum villus of middle supplemented group were significantly improved (P<0.05),and the crypt depth of supplemented groups tended to be reduced,but there was no significant difference (P>0.05);Compared with the blank control group,the apparent digestibility of crude fat and crude fiber of middle supplemented group were significantly improved (P<0.05);The amount of Escherichia coli of middle supplemented group was significantly decreased (P<0.05);And the amount of Lactobacillus was significantly improved (P<0.05).In conclusion,basal diet supplemented with butyrin could promote the growth performance,increase the nutrient digestibility,improve the intestinal morphology and microbial flora of broilers.The best supplemented level of butyrin for diets was 500 g/t.  相似文献   

20.
本试验旨在研究无氮饲粮对14日龄和35日龄肉鸡盲肠微生物菌群结构及内源氨基酸基础损失量的影响。分别选用10日龄和31日龄罗斯(Ross)308雄性肉鸡,随机分为2个组:常规饲粮组和无氮饲粮组,每组5个重复,其中10日龄时每个重复12只鸡,31日龄时每个重复6只鸡,试验期均为4 d。结果表明:肉鸡14日龄和35日龄时,收粪法所得大多数氨基酸内源基础损失量均显著或极显著高于回肠食糜法(P<0.05或P<0.01)。相对常规饲粮,无氮饲粮改变了14日龄和35日龄肉鸡盲肠微生物16S rDNA V3高变区变性梯度凝胶电泳图谱的优势条带,其中14日龄和35日龄发生变化的优势条带灰度值占其整个优势条带总灰度值的比例分别为72%、39%。与常规饲粮相比,无氮饲粮对14日龄肉鸡盲肠食糜重、氨态氮浓度没有显著影响(P>0.05),但极显著降低了盲肠食糜中丁酸浓度(P<0.01),显著降低了异丁酸和戊酸浓度(P<0.05),极显著增加了丙酸浓度(P<0.01)。无氮饲粮组35日龄肉鸡盲肠食糜重极显著高于常规饲粮组(P<0.01),盲肠食糜氨态氮、乙酸、异丁酸、戊酸、异戊酸浓度则极显著降低(P<0.01)。综上所述,采用无氮饲粮测定内源氨基酸基础损失量时,收粪法所得大多数氨基酸内源基础损失量显著高于回肠食糜法。饲喂无氮饲粮4 d后,肉鸡盲肠食糜原有微生物优势菌群发生改变。  相似文献   

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