共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
《养殖与饲料.饲料世界》2021,(6)
为了解陕西省汉中市猪瘟免疫抗体水平,分别在春秋两季集中免疫后从11个县区采集猪血清样品651份,采用阻断ELISA方法进行抗体水平监测。结果显示:春秋两季猪瘟免疫抗体合格率分别为93.13%、89.12%,表明汉中市2020年猪瘟抗体水平合格率较高,猪瘟疫苗免疫效果较好。 相似文献
3.
4.
研究旨在评估新城疫流行风险,为指导新城疫防控提供参考。研究开展2021年辽宁省各市各场点的新城疫免疫抗体和病原学检测,跟踪2013—2021年辽宁省新城疫抗体和病原学监测结果,掌握抗体保护水平和病原分布状态。结果显示,2021年全省共监测新城疫免疫抗体样品3.036 5万份,合格2.895 3万份,平均个体合格率95.35%;监测免疫群体908个,合格880个,平均群体合格率96.92%。辽宁省内各市免疫抗体合格率均在91%以上。2015—2017年均监测到的病原学阳性群体为鸡群,来自种禽场、商品代养殖场及其他场点。研究表明,2013—2021年,辽宁省免疫抗体总体水平呈下降态势;病原学阳性群体均为鸡群,其他场点的群体阳性率高于种禽场和商品代禽场,散养户和市场环节均未监测到病原学阳性群体。 相似文献
5.
为了了解规模化养殖模式下鸡群新城疫和禽流感带毒情况和抗体滴度,从2007年9月~2008年8月,对规模化养殖场肉种鸡定期进行新城疫和禽流感带毒监测和抗体检测。每月采集鸡群气管和泄殖腔棉拭子各30份(抽检率0.3%)进行新城疫和禽流感病毒监测,每2周采集30份血样(抽检率0.3%)进行新城疫和禽流感抗体检测。研究结果显示,监测鸡群从进雏到淘汰未发现新城疫和禽流感病毒感染;从6.5周龄开始,鸡群新城疫和禽流感(H9亚型)抗体一直维持在免疫保护临界值以上,比较之下,禽流感(H5亚型)抗体上升较慢,且滴度比H9低(2~4)log2。 相似文献
6.
7.
8.
海原县部分鸡场新城疫免疫现状调查 总被引:2,自引:1,他引:1
应用血凝试验和血凝抑制试验对采自海原县部分鸡场的239份血样进行了新城疫免疫抗体的检测。血清检测结果表明,所有检样的平均免疫保护率为76.99%。说明海原县部分鸡场中新城疫免疫抗体水平偏低,应及时进行免疫接种并加强抗体监测。 相似文献
9.
《畜牧兽医科技信息》2018,(12)
选取三个规模蛋鸡场各2个批次的鸡群,将每一批鸡对半分成试验组和对照组,给予不同的免疫程序,每个鸡场每月采取100份血样(试验组和对照组各50份),对新城疫抗体进行监测,连续采样监测18个月,共监测样品1800份。新城疫抗体监测结果:对照组在5日龄首免,12日龄二免,60日龄强化免疫,60日龄前免疫抗体已降到4log2以下,出现了免疫空白期。实验组在7日龄进行新城疫首免,28日龄二免,60日龄左右强化,育成期抗体监测比对照组高出1个滴度以上,且能保护整个育雏期和育成期。110日龄以后实验组每两个月用新城疫Ⅳ系苗饮水一次,相对对照组每3~4个月加强免疫,平均抗体效价可维持在5log2以上,保护力加强。 相似文献
10.
本试验对鸵鸟应用不同的疫苗和免疫剂量进行免疫,并采集血样,应用血凝(HA)和血凝抑制(HI)试验,监测了抗体水平,以探索鸵鸟的新城疫免疫程序。 相似文献
11.
12.
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
13.
14.
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
15.
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
16.
17.
18.
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
19.
乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献