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犬球虫病是由孢子纲、球虫目、艾美尔科中的等孢子属球虫引起的,以出血性肠炎为主要症状,以血便、贫血、衰弱、脱水为特征的疾病。主要侵害幼犬,1~6月龄幼犬易感,成犬耐受力较强。1流行病学等孢属球虫卵囊内的胚孢子形成2个孢子囊,每个孢子囊内含4个子孢子。此属球虫除感染犬外, 相似文献
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《畜牧兽医科技信息》2019,(11)
<正>畜禽球虫病是由于畜禽抵抗力下降感染球虫所致,以艾美耳球虫或等孢子球虫比较常见,且危害较大,它们主要破坏肠黏膜。临床表现腹泻、发热、食欲不振、体重减轻、消瘦,甚至死亡。许多动物感染后常呈亚临床型。牛、绵羊、山羊、猪、兔和禽类等均可感染球虫而发病;犬、猫、马也可患球虫病。通过盐水漂浮法或蔗糖漂浮法能够鉴定虫卵。1病原与流行典型的艾美耳球虫和等孢子球虫仅需一个宿主,在宿主体内完成它们的生活周期。一些等孢子球虫有兼性中间宿主。 相似文献
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柔嫩艾美尔球虫子孢子的提纯 总被引：9，自引：0，他引：9
自 Long,P.M.(1965)首次完成用脱囊的柔嫩艾美尔球虫(Eimeria tenella)子孢子感染鸡胚成功后,国内外的许多学者相继用他的方法或略加改进,成功地进行了多种鸡艾美尔球虫的鸡胚感染,但用此种方法获得的子孢子悬液中粪渣和杂质较多,虽对鸡胚的感染影响不大,但不适于球虫免疫学、组织培养和生化分析等方面的研究。纯化的、活的具有感染力的球虫子孢子制备物是 相似文献
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正1球虫目(猪等孢球虫和艾美尔属球虫)球虫(Coccidia)是专性细胞内寄生的寄生性原虫,其中艾美尔球虫属(Eimeria)、等孢球虫属(Isospora)、隐孢子虫属(Cryptosporidium)、弓形体属(Toxoplasma)和住肉孢子属(Sarcocystis)是哺乳动物和鸟类的重要寄生原虫。家畜可感染多种球虫,但是通常仅有几种球虫对某一特定宿主是致病性的。目前,可以有效感染猪的肠道球虫种数尚不得而知,因为仅了解大多数球虫的孢子化卵囊阶段。Levine 相似文献
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据一些文献报告,在饲料中添加氨丙嘧吡啶(amprolium)药剂,可以抑制诸如堆型艾美尔球虫和巨型艾美尔球虫等球虫卵囊的孢子形成。Mathis等发现,对氨丙嘧吡啶产生抗药性的堆型艾美尔球虫株不能证实减少孢子形成。证实,在饮水中给予氨丙嘧吡啶而不是通过饲料给予是否有同样作用尚无报告。氨丙嘧吡啶对布氏艾美尔球虫或柔嫩艾美尔球虫卵囊的孢子形成没有影响。氨丙嘧吡啶对毒害艾美尔球虫卵囊的作用尚未研究。Ruff等证实,在给予不加药的鸡时,从加arprinocid鸡回收的卵囊感染力低于从未加过药鸡回收的等量卵囊。根 相似文献
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《中国畜牧兽医文摘》2012,(6)
<正>畜禽球虫病的病原体是孢子虫纲球虫目艾美耳科的原虫,均系细胞内寄生,各种动物都有其专性寄生的球虫,不相互感染,兽医临床主要是艾美耳球虫属和等孢子球虫属。艾美尔属的特点是卵囊内的胚孢子形成四个孢子囊,每个孢子囊内含有2个子孢 相似文献
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为探讨温度对球虫消杀剂抑制鸡球虫卵囊孢子化的影响,试验以7%氨水作为对照组,设置1:50、1:100、1:150的球虫消杀剂溶液组,同时设置生理盐水对照组.各处理液分别在4℃和20℃下与柔嫩艾美耳球虫未孢子化卵囊在体外相互作用6、12和24h,然后用2.5%重铬酸钾溶液培养处理后的球虫卵囊,观察其孢子化率.结果表明:1:50、1:100、1:150球虫消杀剂在4℃分别处理6、12和24h的卵囊孢子化率均极显著(P<0.01)高于20℃下的对应处理组.球虫消杀剂在20℃下有更好的抑制球虫卵囊孢子化的作用. 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