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为探索小鹅瘟冻干卵黄抗体的被动免疫保护期及抗体效价与免疫持续期的平行相关性,试验采用3种琼扩效价分别为1∶16、1∶32和1∶64的实验室试制冻干卵黄抗体各3批,分别接种1日龄、4日龄健康易感雏鹅,1日龄雏鹅每只注射0.5 m L,4日龄雏鹅每只注射1.0 m L,并于注射后0 h、12 h、24 h、120 h、144 h、168 h、192 h、216 h对试验组和攻毒对照组接种小鹅瘟强毒W株,每只0.2 m L(含100 LD_(50))。结果显示:不同效价的卵黄抗体免疫后144 h内攻毒,卵黄抗体均可对雏鹅提供100%的免疫保护,雏鹅日龄越小,相对保护率越高,卵黄抗体琼扩效价越高,对雏鹅的免疫保护持续期越长。 相似文献
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将实验室试制的3批小鹅瘟卵黄抗体,琼扩效价为1:16,分别稀释成琼扩效价为1:4、1:8,分别按每只0.5 m L接种3日龄易感雏鹅,24 h后,试验组与对照组攻击小鹅瘟病毒。结果显示:雏鹅注射相同剂量不同琼扩效价的卵黄抗体,随着卵黄抗体琼扩效价的升高,对雏鹅的保护率也随之升高。 相似文献
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《广东畜牧兽医科技》2015,(4)
本实验探讨小鹅瘟卵黄抗体对不同日龄雏鹅在小鹅瘟病毒攻击后的治疗试验。将小鹅瘟强毒(H株)病毒液接种1、4、7日龄健康易感雏鹅,攻毒后将鹅按患病程度划分为轻度患病及重度患病组,分别皮下注射琼扩效价为1:16的三批小鹅瘟卵黄抗体实验室产品(批号为:201301、201302和201303),雏鹅注射剂量为1.0 m L/只,注射后观察10日,记录雏鹅发病情况。结果表明,在观察期内,轻度患病雏鹅1日龄治愈率为97.44%,4日龄治愈率为94.87%,7日龄治愈率为90.48%;未注射抗体对照组1日龄92.31%死亡,4日龄91.67%死亡,7日龄85.71%死亡;重度患病雏鹅1日龄治愈率为6.06%,4日龄治愈率为10.00%,7日龄治愈率为9.52%;未注射抗体对照组1日龄100%死亡,4日龄100%死亡,7日龄90.00%死亡。说明采用小鹅瘟精制卵黄抗体治疗不同日龄轻度患病雏鹅,治疗剂量为1.0 m L/只,治疗效果较好,对不同日龄重度患病雏鹅治疗效果不佳。 相似文献
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（一）发病情况 我县香泉镇一养鹅户于2007年3月12日购进1日龄雏鹅3200只,分别于1日龄和8日龄两次用小鹅瘟精制高免卵黄抗体颈背侧皮下注射0．5ml／只和lml／只,12日龄免疫注射禽流感病毒灭活疫苗0．5ml／只。15日龄突然发病死亡7只,次日死亡26只,病鹅40余只,禽主认为鹅感染了小鹅瘟,再次注射小鹅瘟精制高免卵黄抗体1．5ml／只,并在饮水中加入10％氟苯尼考,给鹅自由饮用,第3d死亡98只,病鹅有100余只。 相似文献
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(一)发病情况我县香泉镇一养鹅户于2007年3月12日购进1日龄雏鹅3 200只,分别于1日龄和8日龄两次用小鹅瘟精制高免卵黄抗体颈背侧皮下注射0.5 ml/只和1 ml/只,12日龄免疫注射禽流感病毒灭活疫苗0.5 ml/只.15日龄突然发病死亡7只,次日死亡26只,病鹅40余只,禽主认为鹅感染了小鹅瘟. 相似文献
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小鹅瘟主要发生于雏鹅,并且以21日龄以内的雏鹅较为多见。现将防治小鹅瘟的几点体会总结如下。1预防(1)种蛋的选择。种蛋应选择没有感染过小鹅瘟病毒的种鹅。笔者认为许多小鹅瘟的爆发,都是由于孵化期或在出雏期间感染小鹅瘟病毒造成的。因此,应在种蛋入孵前做好种蛋和孵化环境的严格消毒,保持良好的孵化卫生条件。(2)对种鹅产蛋前1个月进行小鹅瘟疫苗预防接种,使雏鹅产生足够的母源抗体,一般可在15日龄内抵抗小鹅瘟病毒的侵害,这是预防小鹅瘟的有效措施。对雏鹅进行小鹅瘟疫苗注射是不可取的。因为注射疫苗后,机体一般在7天左右产生抗体,15… 相似文献
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鸡抗小鹅瘟病毒卵黄抗体的研制与应用 总被引：1，自引：0，他引：1
小鹅瘟是由小鹅瘟病毒(GPV)感染引起的雏鹅的一种急性传染病。近年来,在养鹅生产中,采用抗血清或卵黄抗体给雏鹅注射进行被动免疫预防本病,取得了较好的防治效果。抗血清或鹅源卵黄抗体生产的成本高、产量低,尚不能满足养鹅业快速发展的需求。为此,试制鸡抗小鹅卵黄抗体(IgY)并进行了防治效果试验和现地应用效果观察。1材料与方法1.1材料海兰蛋鸡40只,由黑龙江省生物制品一厂监察室试验动物室提供;2日龄雏鹅40只,购于哈尔滨市道里区某孵化场,供试验用。GPV免疫用抗原、GPV琼扩抗原及阳性血清和抗小鹅瘟鹅源血清琼扩抗体(效价416),均由… 相似文献
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1 小鹅瘟
小鹅瘟是雏鹅的一种急性败血性传染病,临床特征是病鹅精神沉郁,食欲废绝,严重下痢,并有时伴有神经症状.对于本病,各种抗生素和磺胺类药物均无治疗作用,因此主要做好预防工作.
尽量做到自繁自养,严格按照免疫程序进行免疫接种.母鹅在产蛋前一个月注射小鹅瘟疫苗,可使其所产的蛋孵出的鹅雏具有一定的免疫力.对未获得母源抗体的雏鹅,尤其是存在疫情的情况下,应在出壳当日或三日内接种小鹅瘟血清或卵黄囊抗体,间隔7日后再接种小鹅瘟弱毒疫苗,有时直接对1～3月龄的雏鹅接种小鹅瘟弱毒疫苗(因为雏鹅7月后产生免疫力,所以应注意避免超前感染,以防免疫失败). 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