共查询到20条相似文献，搜索用时 62 毫秒
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挖池蓄水吊养珍珠蚌治理垸内低洼有螺地带的研究 总被引：1，自引：0，他引：1
湖南省常德市鼎城区牛鼻滩镇位于西洞庭湖区 ,是湖南省血吸虫病重疫区之一 ,垸内有螺低洼地原种植水稻 ,居民和耕牛在耕作和放牧时易感染血吸虫病。 1997年人、牛血吸虫病感染率分别为 14 .79%和 16 .94 % ,通过挖池蓄水吊养珍珠蚌治理垸内有螺低洼地试验 ,试区内活螺与阳性螺密度和阳性螺率分别由设点前的 0 .0 5 8只 /0 .11m2、0 .0 0 2只 / 0 .11m2和 0 .0 345 % ,均下降至 0。人、牛血吸虫病感染率分别下降 78.94 %和 81.5 2 % ,每亩年均纯收入较种植水稻提高 10倍以上。 相似文献
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南县农业血防综合治理效益观察 总被引：1，自引：0，他引：1
为探索血吸虫病疫情控制的有效对策,2001年以来,湖南省南县在沱江沿线开展了“四个改变”试验观察,取得了显著的灭螺防病效果与经济效益,试验区湖洲阳性螺密度由2001年的0.0235只/0.11 m2下降为0.0069只/0.11 m2,人、畜血吸虫病感染率分别下降了52.67%、49.04%,试区年均增收节支1406万元。 相似文献
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鹤庆县原是云南省的血吸虫病重疫区,通过几十年的不懈努力,现阶段鹤庆家畜血吸虫病感染率由最高年份（1965）的11．67％降至现阶段的0．25％,感染下降96．1％。疫区范围从原来的7个乡（镇）,55个行政村,269个自然村缩小为1个乡（镇）,16个行政村,91个自然村。钉螺面积由原有的2686,3万m^2降至218．2万m^2,下降91．88％ 相似文献
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为了摸清上饶市湖区鄱阳、余干两县血吸虫病疫情；以乡（镇）为单元全面开展人、畜血吸虫病普查和螺情调查；结果查出病人4万余人，病牛7723头，牛血吸虫病感染率9．9％，钉螺面积27556hm^2，新发现钉螺面积7．4hm^2；调查结论认为湖区有73．6％的耕牛下湖洲有螺草洲放牧感染血吸虫病并传播病原，患血吸虫病牛是病原的主要传染源，加强对病牛的查治和管理是血防工作的重中之重。 相似文献
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封洲禁牧控制湖区血吸虫病效果观察 总被引：5，自引：1，他引：4
通过对都昌县沿湖周边5192．4hm有螺草洲实施封洲禁牧，结合疫区人、畜同步查治，两年(2001～2002)来，耕牛血吸虫病感染率下降了87．81％；人群血吸虫病感染率下降了56．7％；草洲钉螺阳性率和阳性螺密度分别下降了84．29％和75％，结果表明封洲禁牧是大湖区草洲灭螺难的特殊情况下，切断传染源，净化草洲，达到有螺无害(或微害)，控制血吸虫病流行的有效措施。 相似文献
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为探索血吸虫病疫情控制的有效对策,2002年以来,湖南南县在沱江沿线开展了“四个改变”试验观察,取得了显著的灭螺防病效果与经济效益,试验区外洲阳性螺密度由2001年的0.0235只/0.11m2下降为0.0069只/0.11m2,人、畜血吸虫病感染率分别下降了52.67%、49.04%,试验区年均增收节支1406万元。 相似文献
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南县农业血防实施"四个突破"效果效益观察 总被引：1，自引：0，他引：1
为探索血吸虫病疫情控制的有效对策,2000年以来,南县在沱江沿线开展了"四个突破"试验观察,取得了显著的灭螺防病效果与经济效益,试验区外洲阳性螺密度由1999年的0.0235只/0.11m2下降为0.0069只/0.11m2,人、畜血吸虫病感染率分别下降了52.67%、49.04%,试区年均增收节支1406万元。 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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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
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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
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Billinghurst RC Brama PA van Weeren PR Knowlton MS McIlwraith CW 《American journal of veterinary research》2004,65(2):143-150
OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis. 相似文献