复合微生态制剂对肉鸡生长性能和免疫性能的影响

该试验通过将微生态制剂产品倍利素添加到肉鸡的饮水中,研究其对肉鸡生长性能和免疫性能的影响。试验选用150只1日龄健康AA肉鸡,随机分为2组,其中一组为对照组,另一组为试验组,每组3个重复,每个重复25只鸡。预饲期4d,正式期36d。结果表明:在12、19、26、40日龄时检测发现,试验组与对照组相比,料肉比下降,均差异显著(P<0.05),且在整个试验周期内,试验组比对照组料肉比下降10.9%,差异显著(P<0.05)。33日龄时检测发现,试验组的脾脏指数比对照组高出55.1%,差异显著(P<0.05)。26日龄时检测发现,试验组的法氏囊指数比对照组高出65.7%,差异显著(P<0.05)。12、19、26、33和40日龄时检测发现,试验组血清中新城疫血凝抑制抗体效价分别比对照组高出36.6%、40.4%(P<0.05)、37.7%、34.7%和38.8%;试验组盲肠内容物中分泌型IgA含量分别比对照组高出8.59%、10.6%、22.8%、68.7%、23.2%,均差异显著(P<0.05)。19、33、40日龄时检测发现,试验组血清中IgG分别比对照组高出17.9%(P<0.05)、40.9%(P<0.01)、41.1%(P<0.01)。19日龄时检测发现,试验组的E-C3bR、E-ICR花环率分别比对照组提高了105.9%(P<0.05)、14.3%(P>0.05);而在26、33日龄时检测发现,试验组的E-C3bR、E-ICR花环率与对照组相比,差异均不显著(P>0.05)。由此可知,倍利素能够提高肉鸡的生长性能,同时可以在一定程度上增强肉鸡的免疫功能。     

微生态制剂对黄羽肉鸡生长性能和免疫器官发育的影响

选21日龄健康黄羽肉仔鸡(母)176只,随机分成4组,每组2个重复,Ⅰ为对照组,饲喂基础日粮,Ⅱ、Ⅲ和Ⅳ为试验组,分别饲喂在基础日粮基础上添加不同剂量微生态制剂的日粮,试验21d,探讨微生态制剂对肉鸡生产性能和免疫器官发育的影响。结果表明:在21日龄黄羽肉鸡日粮中添加200mg/kg微生态制剂就能显著提高其体重和平均日增重(P<0.05),有提高饲料采食量和饲料转化率的趋势。添加微生态制剂可促进主要免疫器官(胸腺、脾脏和法氏囊)的生长发育,添加量为600mg/kg可显著提高42日龄时胸腺重量、胸腺指数和法氏囊指数(P<0.05)。     

微生态制剂对肉鸡生长性能和免疫器官发育的影响

微生态制剂是一种将有益微生物经过人工分离筛选,再经现代生物工厂化生产出来的活菌制剂,具有维持和改善动物肠道微生态区系的平衡,抑制有害微生物生长,促进有益微生物的生长,增强机体免疫力等作用,从而增进动物的健康水平,促进动物生长发育,提高饲料利用率,且产品中无药物残留。为了验证微生态制剂在肉鸡饲料中的使用效果,为微生态制剂的推广应用提供更多理论依据,进行了本试验。1材料与方法1.1试验材料微生态制剂,含嗜酸乳杆菌和纳豆芽胞杆菌,活菌数为200亿个/g。1.2试验动物分组与处理选择健康、生长良好和体重相近的21d黄羽肉仔鸡240羽,…     

微生态制剂对肉鸡生长和免疫器官的影响

选用180羽岭南黄快大型肉鸡,随机分成2组．对照组饲喂基础日粮,试验组在基础日粮中添加0．1％的益康源微生态制剂．饲养周期41d．比较生长性能和免疫器官指标。结果表明：添加微生态制剂对肉鸡前期采食量、后期和全期耗料增重比均有显著性的影响（p〈0．05）,肉鸡前期的免疫器官重及免疫器官系数均有增加．且对法氏囊重和法氏囊系数影响显著（p〈O．05）。     

复合微生态制剂对黑羽肉鸡生长性能和免疫功能的影响

为探究复合微生态制剂对黑羽肉鸡生长性能和免疫功能的影响。试验选取体重接近、健康状态良好的1日龄黑羽肉鸡480只,随机分为4组,每组6个重复,每个重复20只。Ⅰ组为对照组、Ⅱ、Ⅲ、Ⅳ组为试验组,试验组在基础日粮中分别添加0.5、1.0 g/kg和2.0 g/kg的复合微生态制剂,试验期结束分别测定各组的生长性能指标和免疫功能指标。结果显示,试验Ⅲ和Ⅳ组肉鸡的终末体重、平均日增重均显著高于对照组（P<0.05）,且试验Ⅳ组平均日增重最高,料重比最低。试验Ⅲ、Ⅳ的IgA和IgG含量显著高于试验Ⅰ组（P<0.05）,而IgM含量对各组间均无显著影响（P>0.05）。综上所述,黑羽肉鸡日粮中添加1.0 g/kg和2.0 g/kg的复合微生态制剂能够显著提高其生产性能和免疫功能。     

微生态制剂对肉鸡生产性能及肠道菌群的影响

本试验旨在探讨微生态制剂对肉鸡生产性能及肠道菌群的影响,通过测定肉鸡平均日增重、料重比、血清总蛋白含量、肠道菌群数等指标,探讨微生态制剂对肉鸡生产性能及肠道菌群的影响。结果表明,添加1‰微生态制剂与对照组相比提高平均鸡重16.08%,提高平均日增重7.98%,料肉比降低3.51%,(P0.05);与对照组相比,1‰微生态制剂可以提高血清总蛋白含量14.81%(P0.05);与对照组相比,3‰微生态制剂可以提高盲肠、直肠中乳酸杆菌数量18.04%、7.92%(P0.05),提高大肠杆菌感染肉鸡的盲肠、直肠中乳酸杆菌数量57.80%、49.54%(P0.05);微生态制剂能显著性的降低盲肠、直肠中的大肠杆菌数。结果表明微生态制剂能够提高肉鸡的生长性能并改善肠道菌群。     

在降低代谢能日粮中添加微生态制剂对肉鸡生产性能的影响

试验采用玉米—豆粕—杂粕型肉鸡日粮添加KDN微生态制剂饲喂肉鸡,研究添加不同微生态制剂日粮对肉鸡生产性能的影响。试验结果表明,在正常日粮基础上降低125.6kJ/kg代谢能再添加KDN微生态制剂组日耗料量与正、负对照组差异不显著(P>0.05);日增重在正、负对照组基础上可以显著提高11.7%、12.2%(P<0.05);料肉比在正、负对照组基础上降低0.13、0.11(P<0.05)。在降低代谢能的日粮添加微生态制剂可以提高肉鸡的生长性能。     

微生态制剂——聚力宝对肉鸡生长性能的影响

选用1日龄AA商品肉仔鸡22276羽，随机分成试验、对照两组。对照组饲喂基础日粮，试验组在日粮中添加微生态制剂聚力宝。肉鸡饲养6周后出栏．结果发现：试验组出栏平均体重比对照组高40克／羽，料肉比比对照组降低0．05，利润增加0．53元／羽．经济效益明显高于对照组。     

微生态制剂聚力宝对肉鸡生长性能的影响

选用1日龄AA商品肉仔鸡22276羽,随机分成2组。对照组饲喂基础日粮,试验组在日粮中添加微生态制剂聚力宝。试验期6周后出栏,结果发现:试验组出栏平均体重比对照组高40g/羽,料重比较对照组降低0.05,利润增加0.53元/羽,经济效益明显高于对照组。     

富硒微生态制剂对肉鸡生长性能、屠宰性能和血清抗氧化指标的影响

试验旨在研究富硒微生态制剂对肉鸡生长性能、屠宰性能和血清抗氧化指标的影响。选取480羽1日龄AA肉仔鸡,随机分为4组,每组8个重复,每个重复15羽肉仔鸡。对照组饲喂基础饲粮,3个试验组分别在基础饲粮中添加0.20%、0.40%、0.60%富硒微生态制剂（硒含量≥2 000 mg/kg,有效活菌数≥1×109 CFU/g）,试验期为42 d(1～21 d和22～42 d)。结果表明：相比于对照组,饲粮中添加0.40%和0.60%富硒微生态制剂提高了肉鸡的末重、平均日增重和平均日采食量（P<0.05）,降低了肉鸡耗料增重比（P<0.05）;添加0.40%和0.60%富硒微生态制剂均提高了肉鸡的全净膛率、胸肌率和腿肌率,降低了肉鸡的腹脂率（P<0.05）;添加0.20%、0.40%、0.60%富硒微生态制剂均提高了肉鸡21 d和42 d血清中谷胱甘肽过氧化物酶、过氧化氢酶水平（P<0.05）,降低了肉鸡21 d和42 d血清中丙二醛含量（P<0.05）;添加0.40%和0.60%富硒微生态制剂均提高了肉鸡21 d和42 d血清中超氧化物歧化酶和总抗氧化能力水平（...     

Effect of probiotic on growth performance and digestive enzyme activity of Arbor Acres broilers

The effect of probiotic, Bacillus coagulans NJ0516, on growth performance and digestive enzyme activity of Arbor Acres (AA) broilers was investigated. Strains NJ0516 were added to commercial basal diets as probiotic at three final concentrations: T-1, 1 × 10⁶ cfu g⁻¹; T-2, 2 × 10⁶ cfu g⁻¹ and T-3, 4 × 10⁶ cfu g⁻¹, respectively. Twelve groups, of 30 broilers, with three replicates for each treatment group (T-1, T-2 and T-3) and the control group treated without probiotic were used. After 49 days, broilers receiving the diets supplemented with probiotic showed significantly better growth performances including final weight and daily weight gain (DWG) than those fed the basal diet (control). As for feed conversion ratio (FCR), T-2 and T-3 showed lower value (P < 0.05) than the control. However, there was no significant different in final weight, DWG and FCR between T-1, T-2 and T-3 and the survival rate was not affected (P > 0.05) by the dietary treatments. The higher protease activities were observed in T-2 and T-3 (P < 0.05) compared with the control and T-1. However, there was not significantly different (P > 0.05) between T-2 and T-3 in protease activity. Amylase activity in T-1, T-2 and T-3 was remarkably higher (P < 0.05) than that in the control. Significantly higher amylase activity was observed in T-2 compared with that of T-1. There was no remarkable difference (P > 0.05) in amylase activity of T-2 compared with that of T-3, even though there was a tendency for increased activity. As for lipase activity of duodenum in broilers, assays showed no difference in all treatment groups. It showed that probiotic, B. coagulans NJ0516 administration in feed with a certain concentration displayed a growth promoting effect and increased the protease and amylase activities.     

添加不同油脂对肉鸡生长性能的影响

本文旨在研究饲喂不同油脂对肉鸡生长性能及油脂酸价对采食量和体重的影响。试验选用1日龄罗斯308商品肉仔鸡2100只,随机分为7个处理组,每个组10个重复。处理1组添加豆油,处理2组添加鸡鸭油,处理3组添加精炼混合油A(酸价1 mgKOH/g),处理4～6组分别添加不同酸价的劣质混合油A、B和C(酸价分别为8、35 mgKOH/g和53 mgKOH/g),处理7组添加劣质脂肪酸。结果表明,日粮添加劣质脂肪酸组可显著增加8～21、36～42日龄及1～42日龄肉鸡日采食量和料肉比(P<0.05)。劣质混合油C组8～21日龄肉鸡的采食量显著低于其他处理组;而与豆油组比,劣质混合油B和C组8～21日龄肉鸡日增重和21日龄体重显著降低。混合油的酸价与肉鸡采食量及42日龄体重呈负相关,随着酸价的升高,1～42日龄肉鸡平均采食量和42日龄体重逐渐降低,其中劣质混合油C组采食量显著降低。     

日粮维生素A水平对肉鸡生长性能及营养物质消化率的影响

试验采用单因子完全随机试验设计,以玉米和豆粕为主要原料配制基础日粮,将450只1日龄雌雄各半的健康艾维茵肉鸡,随机分为5个处理组,每个处理组设6个重复,每重复组15只鸡,试验期42d。维生素A的5个添加水平分别为3000、6000、15000、30000和60000IU/kg。在整个试验期内,与3000、6000IU/kg维生素A组相比,30000、60000IU/kg维生素A组的肉鸡生长速度与饲料转化效率有趋于显著的下降趋势(P0.10),15000IU/kg维生素A组生长速度也有降低的趋势。随日粮维生素A水平的增加,肉鸡对日粮粗蛋白质与钙的消化率呈一次线性降低趋势(P0.10),其中,日粮维生素A水平为3000～6000IU/kg时消化率较高,维生素A水平为30000～60000IU/kg时较低。日粮维生素A水平为15000IU/kg时,提示肉鸡维生素A临界过量;日粮维生素A水平达到30000IU/kg以上时,提示肉鸡维生素A过量。     

复合益生菌乳膏剂的制备和对断奶仔猪生长性能的影响

益生菌已经在畜禽养殖中广泛应用于动物保健。当前益生菌制剂仍存在需低温保存且有效期短的问题。此研究开发了一种由干酪乳杆菌、屎肠球菌和约氏乳杆菌组合而成的新型复合益生菌乳膏剂,在室温下贮存56 d后仍可维持较高活菌数(>108 cfu/g)。在断奶仔猪日粮中添加该复合益生菌乳膏剂可提高断奶仔猪平均日增重和末均重(P<0.05)、降低饲料增重比,而不影响平均日采食量。研究结果表明,所制备和优化的复合益生菌乳膏剂具有良好室温保存稳定性,在断奶仔猪中使用可有效促进饲料营养吸收,从而提高生长性能。     

Influence of probiotic supplementation on immune response in broilers raised under hot climate

1. The objective of the study was to evaluate the potential effects of dietary probiotic supplementation and stocking density and their interaction on growth performance, humoral and cellular immune responses of broiler chickens raised under hot climate conditions.

2. A total of 1800 1-d-old unsexed broiler chicks (Ross 308) were allocated in a completely randomised 3 × 2 factorial design, with three concentrations of dietary probiotic (0, 200 and 400 mg/kg) containing 4 × 10⁹ cfu/g of Bacillus subtilis and two stocking densities (12 or 18 birds/m²) in a total of 6 treatment subgroups.

3. Dietary probiotic and stocking density had no significant effect on live body weight, feed consumption and feed conversion ratio.

4. Dietary probiotic supplementation had a positive effect on serum immunoglobulin M (IgM) and cell-mediated immunity when compared to the control at 6 weeks of age, whereas serum immunoglobulin A (IgA) and immunoglobulin Y (IgY) were improved, but not significantly so. Dietary probiotic and stocking density had no effect on relative weights of the bursa of Fabricius and spleen.

5. Dietary probiotic supplementation had a positive significant effect on serum IgM concentration and cell-mediated immunity without penalising growth performance in broilers raised under high ambient temperature.     

枯草芽孢杆菌制剂对肉鸡生长、胴体和鸡肉品质的影响

本文研究了枯草芽孢杆菌制剂对肉鸡生长性能、胴体和鸡肉品质的影响。选用90羽7日龄的肉仔鸡,随机分成3个处理组,每个处理设3个重复。对照1组饲喂基础日粮,对照2组饲喂基础日粮添加0.05%的硫酸新霉素制剂,试验组饲喂基础日粮添加0.1%的枯草芽孢杆菌制剂。试验期35d。试验结果表明:试验组肉鸡的末期平均体重、净增重和日增重均比对照1组高,且差异显著(P<0.05),但均比对照2组低,差异不显著(P>0.05)。试验组鸡的平均采食量均略高于两对照组(P>0.05),试验组的饲料转化率较对照1组提高3.14%,比对照2组低1.59%(P>0.05)。试验组肉鸡胴体品质的各项指标与两对照组相比,除了腿肌重和腿肌率有显著差异外(P<0.05),其余各项指标均无显著差异(P>0.05)。试验组鸡肌肉氨基酸总量、必需氨基酸和鲜味氨基酸含量均高于两对照组。这表明在较高的营养水平条件下添加枯草芽孢杆菌制剂对肉鸡生长具有一定的促进作用,对肉鸡胴体和鸡肉品质无不良影响,可增加鸡肉鲜味。     

Effects of supplementation of beta-glucan on the growth performance and immunity in broilers

Two experiments were conducted to evaluate the efficacy of beta-glucan on commercial broilers. In experiment 1, one hundred and forty-four broiler chicks were employed in a 2x3 factorial design with cage and open floor housing with three levels of beta-glucan viz. 0%, 0.02% and 0.04%. In experiment 2, ninety-six broilers were used with 4 treatments: No beta-glucan and antibiotic (T1), beta-glucan 0.03% (T2), antibiotic (T3), and beta-glucan 0.03% + antibiotic (T4) for 34 d with 3 replicates of 8 chicks each in both studies. During experiment 1 there was no significant effect of the feeding system or the beta-glucan levels on the performance from 0 to 17 d but during 18-34 days birds housed on the open floor had significantly (p<0.0001) higher weight gain compared with those in cages. In experiment 2, no significant effect was noticed on the weight gains when the effect of beta-glucan, antibiotic or their interaction were tested. The retention of dry matter increased in both experiments with beta-glucan supplementation. The CD8 and TCR 1 cells were significantly higher in the 0.04% beta-glucan group at 42 days as compared with the control. It could be concluded that beta-glucan supplementation was beneficial for broilers.     

Effect of probiotic supplementation on growth,nitrogen utilisation and serum cholesterol in broilers

1. The effect of dietary probiotic supplementation on the growth, nitrogen utilisation and serum cholesterol content of broiler chickens was studied in 2 trials.

2. In experiment 1, the birds receiving the 0, 75, 100, 125 mg probiotic/kg diets had weight gains of 1204.0, 1272.0, 1268.3 and 1210.5 g, respectively at the end of 8 weeks of feeding. The group of birds fed on the 75 mg probiotic supplemented diet retained significantly (P<0.01) more nitrogen than the control birds. Serum cholesterol content was lower in the probiotic‐supplemented birds (93.3 mg/100 ml) compared to the control birds (132.2 mg/100 ml).

3. In the second experiment the probiotic plus antibiotic‐supplemented group of birds had the maximum weight gain (1148.5 g) followed by antibiotic (1141.3 g), probiotic‐supplemented (1128.4 g) and control birds (1045.6 g) after 6 weeks. Nitrogen retention was greatest in the antibiotic—(48.5%) followed by the probiotic—(46.5%), probiotic plus antibiotic‐supplemented groups (46.3%) compared to 40.2% in control birds.

4. The apparent metabolisable energy was greatest in birds receiving the probiotic plus antibiotic‐supplemented diet (12.37 MJ/kg) followed by antibiotic—(12.00 MJ/kg), probiotic‐supplemented birds (11.92 MJ/kg) than in control birds (11.62 MJ/kg). Serum cholesterol was significantly (P<0.01) lower in probiotic‐supplemented birds (86.1 mg/dl) compared to 118.4 mg/dl in control birds.     

复合益生菌发酵饲料对纳雍土鸡生长性能、屠宰性能和肉品质的影响

文章旨在研究复合益生菌发酵饲料对纳雍土鸡生长性能、屠宰性能和肉品质的影响,试验采用单因素试验设计,将120只40日龄的健康纳雍土鸡随机分成2组(对照组和试验组),对照组饲喂基础日粮,试验组饲喂复合益生菌发酵饲料,检测平均日增重、平均日采食量、料重比、屠宰率、半净膛率、全净膛率、胸肌率、腿肌率、a*值、b*值、L*值、p...     

补饲青绿饲料对不同性别肉仔鸡屠宰品质的影响

试验旨在探讨饲喂全价基础日粮的基础上补饲青绿饲料对不同性别肉仔鸡屠宰品质的影响。选择1日龄健康AA肉鸡360只(公母各半),根据不同性别随机分成4组,每组3个重复,每重复30只。分别设为Ⅰ♂、Ⅱ♂、Ⅰ♀、Ⅱ♀组。Ⅰ♂和Ⅰ♀为对照组,饲喂全价基础日粮,Ⅱ♂和Ⅱ♀为试验组,全期补饲新鲜青绿饲料。分别于第14、28、42日龄(d)时取样进行屠宰品质分析。结果表明:①各试验日龄公鸡的体重高于母鸡(P<0.05或<0.01);42日龄时公鸡的屠宰率和半净膛率高于母鸡(P<0.05),腹脂率低于母鸡(P<0.05)。②补饲青绿饲料能显著提高肉仔鸡胸肌率(P<0.05)和降低腹脂率(P<0.05),42日龄时公鸡和母鸡的胸肌率分别提高了14.9%和16.4%,腹脂率分别降低了20.8%和22.2%。③补饲青绿饲料对肉仔鸡屠宰率、半净膛率、全净膛率和腿肌率无显著影响。④总体上补饲青绿饲料对母鸡屠宰品质的影响作用更大。