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对鸭肝炎鸡胚化弱毒株MY接种4日龄雏鸭后的组织变化进行了动态观察比较研究。结果显示：雏鸭接毒12 h肝、肾呈现轻度细胞变性;48 h后组织变性程度减轻,汇管区周围细胞增生;144 h细胞核、浆染色加深,组织修复迹象明显;14 d结构正常。接毒12 h脾脏白髓、法氏囊滤泡中淋巴细胞减少,72 h脾、24 h法氏囊中淋巴细胞有所增多。心脏、肺、脑组织在接毒各期皆有轻度的充血、出血。鸭肝炎鸡胚化弱毒株MY与标准毒导致的多组织变性、坏死相比,其变性轻而可逆;与疫苗HY所致的组织变化相似,但结构恢复时间早。结果表明：鸭肝炎鸡胚化弱毒株MY接种4日龄雏鸭,虽可造成雏鸭肝、肾等实质器官轻微的组织病变,但损伤的组织结构可在短期内修复,并恢复至正常;脾脏、法氏囊中的淋巴细胞在接毒后,也由减少到增多。本研究为鸭肝炎鸡胚化弱毒株MY用作鸭肝炎疫苗株的安全性从病理组织学角度提供了依据。 相似文献
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黄学家 《河南畜牧兽医(综合版)》2014,(6):36-37
1 雏鸭肝炎弱毒疫苗
用于预防雏鸭肝炎,采用雏鸭肝炎鸡胚化或鸭胚化弱毒株,接种12～14日龄鸭胚尿囊腔或9～10日龄鸡胚尿囊腔,收获48～96h内死亡胚的尿囊液, 相似文献
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用Ⅰ型鸭肝炎鸡胚化弱毒MY株人工接种4日龄雏鸭,于接种后第6、12、24、48、72、96、144、168、192h及14d采集接种鸭的血液,分离血清,进行生化指标测定,并与同期接种的弱毒疫苗HY、标准毒及对照组的血清生化指标进行比对。与对照组比较：MY组和HY组的白蛋白在接种后24h明显降低,48h差异极显著;血清谷丙转氨酶于24h、144h时段明显升高,且MY组持续至192h。标毒组则表现为接毒后,血清葡萄糖于24～96h降低,甘油三酯于72h、192h显著升高;血清总蛋白72h、96h、144h,白蛋白24—144h,球蛋白72～96h,144h明显降低;谷丙转氨酶于24～192h,血清谷草转氨酶在24～72h显著升高;尿酸72h呈一过性升高。结果表明,感染Ⅰ型鸭肝炎鸡胚化弱毒MY株与弱毒疫苗HY的血清生化变化规律相似。 相似文献
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1 雏鸭肝炎弱毒疫苗
本品用于预防雏鸭肝炎．采用雏鸭肝炎鸡胚化或鸭胚化弱毒株,接种12～14日龄鸭胚尿囊腔或9～10日龄鸡胚尿囊腔,收获48-96h内死亡胚的尿囊液,加入5％蔗糖脱脂乳,经冷冻真空干燥制成。呈乳白色海绵状疏松团块,加稀释液后迅速溶解。 相似文献
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广东新兴株Ⅰ型鸭病毒性肝炎鸡胚化弱毒疫苗的研制 总被引：1，自引：0，他引：1
本试验从广东新兴地区分离的I型鸭病毒性肝炎毒株中筛选出免疫原性优良SS毒株,用鸡胚传代培育出Ⅰ型鸭肝炎病毒79代鸡胚化弱毒疫苗株SS79.按弱毒疫苗规程相关试验结果表明,该苗对1日龄雏鸭安全无致病性,免疫剂量为10-5.16个EID50/只.接种1日龄雏鸭后第3天可检测到抗体,7 d可产生高峰期中和抗体,并可完全保护雏鸭抵抗同型强毒的攻击,1次免疫抗体可维持4周以上.疫苗在-20℃保存6~12个月仍能保持良好的免疫原性. 相似文献
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鸭坦布苏病毒对雏鸭免疫系统的影响 总被引：1，自引：0，他引：1
《中国兽医学报》2017,(2):211-217
为研究鸭坦布苏病毒(DTMUV)对雏鸭免疫系统的影响,本试验对5日龄雏鸭静脉接种DTMUV,并于接种后不同时间取雏鸭脾脏、胸腺、法氏囊进行组织病理学、抗原和凋亡检测。结果显示,DTMUV感染雏鸭的脾脏、胸腺、法氏囊均严重受损。接种DTMUV后4d,脾脏淋巴细胞减少,胸腺可见严重细胞崩解和大面积坏死区域,法氏囊滤泡轻度萎缩;接种后6d免疫器官病变最为严重,其中胸腺静脉严重栓塞,淋巴细胞变性坏死,空泡化也更加严重;接种后8d免疫器官病变均有所减轻,至16d,免疫器官结构基本恢复正常。通过免疫组织化学方法在感染雏鸭的脾脏、胸腺、法氏囊中均检测到DTMUV抗原;细胞凋亡试验显示DTMUV能够显著引起脾淋巴细胞凋亡。综上所述,DTMUV可严重损伤雏鸭免疫器官,且这种损伤常发生于感染早期,并于感染后8d出现好转。 相似文献
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１接种程序１．１出壳后２４h内无母源抗体的雏野鸭皮下或胸肌接种鸭肝炎弱毒苗；有母源抗体的雏野鸭７～１０日龄时，接种上述疫苗。１．２１４日龄胸肌接种鸭瘟弱毒苗。１．３４２日龄颈部皮下接种禽出败灭活菌苗。１．４６０日龄胸肌接种鸭瘟弱毒疫苗。１．５９０日龄颈部皮下接种禽霍乱油乳剂菌苗。１．６１２０日龄母野鸭（开产前３０d）胸肌接种鸭肝炎弱毒苗；１３５日龄时再接种鸭肝炎弱毒苗１次。１．７２８０日龄（母野鸭停产期）胸肌接种鸭瘟弱毒疫苗。１．８成年经产种野鸭每年春秋两季各注射一次鸭瘟弱毒苗和禽霍乱油乳剂苗。２… 相似文献
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鸭胚化小鹅瘟弱毒疫苗对24曰龄鹅胚和1口龄雏鹅安全;对晚期鹅胚免疫力较差,对1日龄雏鵝,接种后10天可产生坚强的免疫力。木试验用鸭胚化小鹅瘟弱毒疫苗对24曰龄鹅胚和1日龄雏鹅免疫接种,检测对小鹅的安全性及免疫效力。现将结果报道如下。 相似文献
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将分离的一株DHv—Ⅰ野毒株经鸡胚传代,培育出DHV—Ⅰ的80代鸡胚致弱毒GFS99株。该弱毒株对1日龄雏鸭无致病性;在雏鸭体内连续盲传5代,也未出现毒力返强现象;1日龄雏鸭免疫100倍稀释的尿囊液弱毒GFS99后7天攻强毒GQY07株,保护率高达100％,且7日龄时即可产生高峰期中和抗体,后抗体效价有所下降,但易感期的3周内抗体保持较高水平;另外该弱毒的外源病原检验结果均为阴性和特异性实验结果良好。综上述结果表明,该弱毒GFS99株无外源病毒污染、特异性强、安全性好、遗传性稳定、免疫原性强,可以作为制备DHV—Ⅰ弱毒疫苗的候选株。 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