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将280只1日龄海兰褐蛋公雏随机分为7组,每组40只,各试验组在基础日粮中分别添加50、100、150、200、250和300mg/kg的阿散酸(对氨基苯砷酸),饲养70天,通过体重和免疫器官指数来测定砷制剂对鸡生长性能及免疫器官生长发育的影响。结果表明:在70日龄时,添加150,200,250和300mg/kg阿散酸组体重和免疫器官指数与对照组相比差异显著(P<0.05),其中200mg/kg组体重及免疫器官脏体比较对照组差异极显著(P<0.01)。因此,雏鸡饲料中添加阿散酸能提高雏鸡的生长性能和免疫器官指数,其最佳添加剂量为200mg/kg。 相似文献
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不同砷制剂添加剂量对雏鸡免疫功能的影响 总被引：4，自引：1，他引：3
将210只1日龄海兰褐蛋公雏随机分为7组,每组30只,分别在各组日粮中添加0(对照组)、50、100、150、200、250、300 m g/kg的阿散酸连续饲喂70 d,通过对血清溶菌酶含量、碳粒廓清指数、免疫器官指数、新城疫抗体水平和血清球蛋白含量的测定来探讨有机砷制剂阿散酸对机体免疫功能的影响。试验结果表明日粮中添加200 m g/kg的阿散酸时能显著提高血清溶菌酶含量(P<0.01)、碳粒廓清指数(P<0.01)、免疫器官指数、新城疫抗体水平和血清球蛋白含量(P<0.01)。说明,雏鸡日粮中添加阿散酸能提高机体的免疫功能,并且添加200 m g/kg时效果最佳。 相似文献
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试验旨在探讨假蒟提取物（PSE）对育雏期儋州鸡生长性能、免疫器官指数、免疫球蛋白、血清生化指标和抗氧化功能的影响。选用500只体重相近、健康状况良好的1日龄雏鸡,随机分为5组,每组5个重复,每个重复20只雏鸡。BC组（对照组）雏鸡饲喂基础日粮,PC组（抗生素组）在基础日粮中添加200 mg/kg恩诺沙星,PSE1组、PSE2组、PSE3组分别在基础日粮中添加100、200、300 mg/kg的PSE。试验期28 d。结果显示,PSE1组雏鸡血清过氧化氢酶活性显著提高（P<0.05）;PSE1组和PSE2组雏鸡血清总抗氧化能力显著提高（P<0.05）;PSE2组和PSE3组雏鸡血清尿酸含量、丙二醛含量显著降低（P<0.05）。研究表明,添加PSE可提高雏鸡生长性能和抗氧化功能,降低血清中尿酸含量,且添加剂量以200 mg/kg为宜。 相似文献
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试验研究了复制3种生长促进剂组合使用对断奶仔猪生产性能的影响。试验选择128头28±1日龄、平均断奶体重（7．78±0．74）kq的健康三元（杜×长×大）杂交仔猪，按体重和性别分成4个处理组，每个处理4个重复，每个重复8头仔猪。第1组为对照组，饲喂玉米-豆粕型基础日粮；第2组添加喹乙醇（50mg／kg）、阿散酸（150mg／kg）；第3组添加喹乙醇（50mg／kg）、吉他霉素（60mg／kg）；第4组添加喹乙醇（50mg／kg）、阿散酸（150mg／kg）、吉他霉素（60mg／kg）。研究结果表明，各试验组日增重、料肉比得到显著改善（p〈0．05），腹泻率显著下降（p〈0．01）。 相似文献
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文章旨在研究牛膝多糖对雏鸡免疫功能的影响。试验将120只1日龄雏鸡随机分为4组,每组3个重复,每个重复10只鸡（公母各半）。在常规饲料中分别添加200、150、100、0 mg/kg牛膝多糖。所用雏鸡连续饲喂至30日龄,每组取10只进行取样。计算动物机体免疫器官指数,MTT检测T细胞增殖活性,Griess检测巨噬细胞释放NO能力,ELISA检测血清总IgG水平。结果表明,在雏鸡饲料中添加中剂量（150 mg/kg）的牛膝多糖能显著提高雏鸡免疫器官指数、T细胞增殖活性、巨噬细胞释放NO能力和血清总IgG水平（P <0.05）。结论 ：牛膝多糖在一定程度上对雏鸡的免疫功能具有增强作用,从而提高机体抗病能力,饲料中牛膝多糖最适添加量为150 mg/kg。 相似文献
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《饲料工业》2016,(18)
试验研究了在日粮中添加100~300 mg/kg姜黄提取物对文昌鸡生长性能、血液指标和免疫器官指数的影响。300只1日龄雏鸡集中育雏2周后,随机分为4个处理组,每个处理5个重复,每个重复15只。T0组饲喂基础日粮,T100、T200和T300组分别在基础日粮中添加100、200 mg/kg和300 mg/kg姜黄提取物,饲养至12周龄。结果表明,日粮中添加100~200 mg/kg姜黄提取物能提高9~12周龄文昌鸡生长性能。日粮添加姜黄提取物对文昌鸡血液指标无显著影响(P0.05),但可提高9~12周龄文昌鸡胸腺和法氏囊指数。上述结果提示,在日粮添加100~300 mg/kg姜黄提取物可促进和提高文昌鸡后期生长性能和免疫器官指数。 相似文献
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试验选用200只1日龄海蓝褐蛋雏鸡,分为6个组,每组30只,对照组饲喂基础日粮,试验组在基础日粮的基础上分别添加10^7du／g益生素,300mg／kg黄芪多糖,30mg／kg酵母多糖,5×10^6cfu／g益生素＋150mg黄芪多糖和5×10^6cfu／g益生素＋15mg酵母多糖,试验周期50d。试验结果表明：益生素和多糖均能提高雏鸡的生长性能,免疫器官指数和抗体滴度和血清溶茵酶含量,而以益生素＋黄芪多糖组效果最好,而益生素＋酵母多糖组在本次试验中则没有体现出复配优势。 相似文献
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苜蓿素对AA肉仔鸡免疫指标的影响 《畜牧与饲料科学》2015,36(3):14-14
为研究不同剂量的苜蓿素对AA肉仔鸡免疫指标的影响,选取1日龄AA肉仔鸡120只,随机分为4组,对照组饲喂基础日粮,试验Ⅰ~Ⅲ组基础日粮中分别添加150、300、450 mg/kg苜蓿素。分别于28、35和42 d从每组取10只鸡进行采血,测定血清球蛋白含量;取法氏囊和脾脏,称重并计算免疫器官指数;采用MTT比色法测定T、B淋巴细胞增殖能力。结果表明,基础日粮中添加300 mg/kg苜蓿素饲喂28 d,能够显著提高AA肉仔鸡法氏囊指数（P〈0.05）;添加450 mg/kg苜蓿素饲喂28 d,能够显著提高AA肉仔鸡血清球蛋白含量和免疫器官指数（P〈0.05）。添加300 mg/kg苜蓿素饲喂35 d,能够显著提高AA肉仔鸡血清球蛋白含量、免疫器官指数（P〈0.05）,显著促进B淋巴细胞增殖（P〈0.05）;添加450 mg/kg苜蓿素饲喂35 d,能够显著提高血清球蛋白含量、脾脏指数（P〈0.05）,显著促进T淋巴细胞增殖（P〈0.05）,极显著促进B淋巴细胞增殖（P〈0.01）。添加300和450 mg/kg苜蓿素饲喂42 d,能够极显著提高AA肉仔鸡法氏囊指数（P〈0.01）;添加450 mg/kg苜蓿素饲喂42 d,能够显著促进B淋巴细胞增殖（P〈0.05）。结果提示,日粮中添加苜蓿素能够提高多项AA肉仔鸡免疫指标,以添加450 mg/kg效果最优。 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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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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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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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