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益生菌和绞股蓝联合使用对肉仔鸡生产性能的影响 总被引：1，自引：0，他引：1
为探讨益生菌与绞股蓝联合使用在肉仔鸡生产中的协同作用效果,将乳杆菌微胶囊、枯草芽孢杆菌菌粉、地衣芽孢杆菌粉和中草药绞股蓝按一定比例混合复配成益生菌-绞股蓝复合微生态制剂;在1日龄AA肉仔鸡基础日粮中分别添加1 g/kg的益生菌制剂、5 g/kg的中草药绞股蓝粉剂和6 g/kg的益生菌-绞股蓝复合微生态制剂,对肉仔鸡生长性能、免疫器官指数、新城疫抗体效价和肠道菌群变化进行分析。结果表明:益生菌-绞股蓝复合微生态制剂组与益生菌组、绞股蓝组相比,可以显著提高肉仔鸡生产性能,在整个试验期增重分别提高了1.45%和6.73%;饲料增重比分别下降了5.45%和9.05%;显著促进机体免疫器官发育,在整个试验期法氏囊指数分别提高26.14%和32.19%;脾脏指数分别提高32.84%和45.6%;显著提高鸡新城疫抗体效价(P<0.05),明显改善肉仔鸡肠道菌群平衡(P<0.05)。说明益生菌和绞股蓝联合使用对于提高肉仔鸡生产性能、增强机体免疫力和改善肠道微生态平衡等方面均具有较好协同作用。 相似文献
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以添加不同水平的牛磺酸日粮饲喂艾维茵商品代肉仔鸡,探讨牛磺酸对肉仔鸡生产性能和免疫功能的影响。试验研究表明:日粮中添加牛磺酸可以提高肉仔鸡的生产性能和平均日增质量,降低料肉比,其中以0.1%添加量效果最为显著。各试验组3周龄肉仔鸡免疫效果要好于6周龄,3周龄时,0.1%和0.2%的添加量显著提高脾、法氏囊和胸腺的相对指数,提高血清中总蛋白质量浓度(P<0.05),而对6周龄肉仔鸡免疫器官指数和血清蛋白质量浓度影响差异不显著。 相似文献
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外源谷氨酰胺对肉仔鸡免疫器官发育的影响 总被引：5，自引：1，他引：4
将192只1日龄肉仔鸡随机分成4组,各试验组日粮在基础日粮中分别添加0.1%,0.4%,0.8%的谷氨酰胺,试验21d以测定谷氨酰胺对早期肉仔鸡免疫器官发育的影响。结果表明:谷氨酰胺对肉仔鸡的免疫器官的发育有促进作用,从而提高体重和平均日增重,其中添加0.8%时法氏囊和脾脏的重量及法氏囊指数显著大于对照组。 相似文献
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为了研究羧甲基-β-1,3-葡聚糖对肉鸡生长性能和免疫功能的影响,试验采用单因素随机试验方法,选择1日龄AA肉仔鸡160只,随机分为4组,对照组饲喂玉米-豆粕型基础日粮,1,2,3组分别在基础日粮中添加40,80,120 mg/kg羧甲基-β-1,3-葡聚糖,试验期为42 d。对肉仔鸡生产性能、免疫器官相对重量、体液免疫指标进行测定。结果表明:在肉仔鸡基础日粮中添加40 mg/kg羧甲基-β-1,3-葡聚糖可显著提高29～42日龄鸡的日增重、血清禽流感(H5)抗体效价和0～28日龄脾脏和法氏囊的相对重量(P0.05),对肉仔鸡的死亡率无显著影响(P0.05)。说明羧甲基-β-1,3-葡聚糖可提高肉仔鸡日增重及机体免疫应答能力,可以作为一种安全、高效的功能性饲料添加剂用于畜牧生产。 相似文献
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试验选用1日龄AA肉仔鸡240只,随机分为3个处理组,每个处理组4个重复,每个重复20只。三个处理组分别饮清水、乳酸杆菌菌液和产木聚糖酶乳酸菌菌液。通过测定肉仔鸡增重、采食量、料肉比、血液生化指标和免疫器官指数,研究产木聚糖酶乳酸杆菌对肉仔鸡生产性能及免疫功能的影响。结果表明,在试验前、后期通过饮水添加产木聚糖酶乳酸杆菌对肉仔鸡生产性能无显著影响(P0.05),但可显著提高法氏囊指数(P0.05)。添加产木聚糖酶乳酸杆菌对肉仔鸡可显著提高血清中球蛋白和葡糖糖水平(P0.05),显著降低肉仔鸡生长前期血清中尿素、总胆固醇、甘油三酯水平(P0.05)。通过在饮水中添加产木聚糖酶乳酸杆菌可改善肉仔鸡机体免疫水平,但对肉仔鸡生产性能无显著影响。 相似文献
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谷氨酰胺对肉仔鸡生产性能及免疫机能的影响 总被引：7，自引：0，他引：7
为了研究日粮中添加谷氨酰胺(Gln)对肉仔鸡生产性能及免疫机能的影响,本试验选取270只1日龄AA肉仔鸡随机分成3组,分别在日粮中添加0、0.2%、0.4%Gln,测定各组生长及屠宰性能、免疫器官指数、新城疫HI抗体滴度和外周血T淋巴细胞百分率.结果表明:日粮添加0.2%、0.4%Gln对肉仔鸡生长、屠宰性能有较好的促进作用,并能加快胸腺和脾脏发育,延缓法氏囊退化;添加Gln可提高新城疫HI滴度,其中以14、28日龄时0.2%的添加剂量提高最为显著(P<0.05);Gln可促进肉仔鸡外周血T淋巴细胞的分裂增殖,其中以42日龄时0.2%的添加剂量提高最为显著(P<0.05).由此可知,日粮中添加0.2%、0.4%Gln能够提高肉仔鸡生产性能、增强免疫功能,其中0.2%的添加量较好. 相似文献
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文章旨在研究紫苏籽提取物对肉仔鸡的饲喂效果,主要通过研究紫苏籽对肉仔鸡生产性能和免疫机能的影响,探讨其作用规律和调节机理,为进一步开发紫苏籽提取物提供科学依据。试验结果显示:①紫苏籽提取物可以提高肉仔鸡的生产性能,试验Ⅲ组与对照组相比,21～42日龄日增重和全程日增重均有所提高;各阶段料重比和全程料重比均有降低;21～42日龄和全程存活率均有所提高;增重饲料成本降低了11.86%(P<0.01)。②与对照组相比,试验Ⅲ组使肉仔鸡的免疫器官指数、新城疫HI抗体效价、E花环形成百分率、淋巴细胞转化率、血清IgG均有所提高。试验结果表明,紫苏籽提取物能促进肉仔鸡生长,增强免疫力,其效果与抗生素相当。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献