共查询到19条相似文献,搜索用时 78 毫秒
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<正>鸡球虫病是一种肠道寄生性原虫病,主要由艾美耳属的多种球虫引起。此病是通过球虫卵囊传播,鸡吞食孢子化卵囊而感染,这种病分布广,发生普遍,对雏鸡危害最大。2008年3月,笔者在走访养鸡专业户中,针对常见的 相似文献
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鸡球虫病是艾美耳属球虫寄生于鸡的肠道上皮细胞而引起的寄生虫病,临床上以血痢、消瘦、贫血、采食量下降为主要特征。本病多发于3—6周龄鸡群,肉鸡多发,夏季多发,危害严重,已成为影响养鸡效益的关键疾病之一。1危害1.1鸡球虫病发病广泛,鸡球虫与鸡同存,凡是养鸡的地方就有鸡球虫的存在,条件适宜时即可发病,鸡球虫破坏鸡肠道天然屏障,继发细胞感染,引起大批死亡,死亡率可达80%。1.2鸡球虫对抗球虫药物易产生耐药性,长时间使用一种抗球虫药物会导致耐药性的形成。鸡球虫卵囊抵抗力很强,多数消毒剂不能杀死,一旦发病,不易净化,药物治疗不彻底,… 相似文献
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鸡球虫病是养鸡业中最为常见、多发和危害极大的肠道寄生性原虫病,病原为艾美耳属的多种球虫。柔嫩艾美耳球虫寄生在盲肠黏膜内,称盲肠球虫。毒害艾美耳球虫寄生在小肠中段黏膜内,称小肠球虫。这两种球虫对雏鸡和育成鸡的危害十分严重,耐过的雏鸡生长缓慢,发育不良。成鸡多为带虫者,是危害养鸡生产的一种重要寄生虫病。而鸡组织滴虫病又称鸡盲肠肝炎,是鸡的一种急性原虫病。由 相似文献
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<正>鸡球虫病是由艾美耳等7种艾美耳球虫引起的传染性消化道寄生虫性机能紊乱性疾病。是养鸡生产中最耗资、最普遍的疾病之一。所有日龄和品种的鸡对鸡球虫都易感染,耐过的雏鸡生长缓慢,发育不良。成鸡多为带虫者,体增重和产蛋量受到一定影响。随着球虫耐药性的不断增强, 相似文献
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<正>鸡球虫病是鸡的一种重要寄生虫病,它主要由艾美耳属的九种球虫所引起的.鸡球虫是一种全球性分布的寄生虫。在生产中,本病对养鸡业特别是肉鸡业的危害很大,概括起来有个 相似文献
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Abstract. Eimeria branchiphila sp. nov. is described from the roach, Rutilus rutilus L., collected in Bulgaria. Sporulated oocysts were found in gill secondary lamellae and less frequently were associated with melano-macrophage centres in the spleen and in kidney interstitial tissue. In the gills, parasite cells identified as zygotes and sporulation stages were also encountered. This unusual site of sporulation represents a mechanism of sporocyst dispersal previously not recorded in fish coccidia. 相似文献
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Abstract. The present knowledge of oocyst morphology, life cycles, classification and pathogenicity of eimeriid coccidia infecting fishes is reviewed. Compared with typical Eimeria species from higher vertebrates, fish coccidia, currently classified as all belonging to the same genus, differ in having, as a rule, a thin oocyst wall and endogenous sporulation. Some species possess a bivalved sporocyst, a structure and consequently an excystation mechanism, essentially different from that of the genus Eimeria. An analysis of the life cycles of more than 120 recorded species of fish coccidia has shown six different types of developmental patterns. The life cycles offish coccidia are compared with the life cycles of coccidia in general. None of the fish coccidia having a sporocyst with a Stieda body sporulates exogenously and therefore do not display a true eimerian developmental pattern. In view of the importance of sporocyst structure and developmental patterns in taxonomy, the revalidation of Labbé's genera Goussia and Crystallospora is proposed along with the establishment of a new genus, Epieimeria n.g. Most of the species offish coccidia are left within the genus Eimeria until new data make possible their correct classification. Detailed data on histopathological changes are available only in infections by two carp-infecting species, E. carpelli and E. subepithelialis and E. funduli infections in killifishes. The potential threat of coccidiosis in fishes reared under intensive conditions requires a thorough study of the pathogenicity of further species infecting commercially important hosts. 相似文献
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K. MOLNÄR 《Journal of fish diseases》1982,5(6):461-470
Abstract. In the intestinal epithelium of 3–5-summer old tench, Tinca tinca L., an unknown Eimeria sp. developing white, pinhead-sized nodules was found. Oocysts were shed in a non-sporulated state, but at 20°C in tap water they completed sporulation and resembled Eimeria subepithelialis , a parasite of common carp. During the period of examination, in April and May, only young oocysts and gamogonic stages developing in the epithelium of the mucosa were detected. Despite the morphological similarities and nodular occurrence there are significant differences between the nodular coccidiosis of the tench and common carp. 相似文献
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K. MACKENZIE 《Journal of fish diseases》1981,4(6):473-486
Abstract. Eimeria sp. infection of blue whiting, Micromesistius poutassou (Risso), taken to the north and west of Scotland, was investigated with particular reference to the effect on host condition. Eimeria sp. is a parasite of the liver parenchyma and causes extensive lesions. Juvenile blue whiting were not found to be infected before the late 1-group stage, but all 308 adult (3- to 17-group) fish examined were infected. Condition factor ( k = 100 w/l3 ) showed a statistically significant decrease with increasing intensity of infection. Average value of liver weight, expressed as a percentage of total body weight, also decreased with increasing intensity of infection. It is concluded that Eimeria sp. infection is a major factor contributing to loss of condition in blue whiting from the study area. The loss of weight in fish with moderate-to-heavy infections was estimated at from 6 to 10%; this figure does not take account of mortalities resulting from Eimeria infection nor does it take account of the most heavily infected fish which could not be included in the analysis because sufficiently accurate estimates of the large numbers of oocysts present were not made. 相似文献
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Abstract. During a survey for coccidian infections of 135 Australian freshwater fish belonging to 14 species, two new Eimeria species, E. philypnodoni sp. nov. from Philypnodon grandiceps and E. ashburneri sp. nov. from Macquaria ambigua , and three new Goussia species, G. langdoni sp. nov, from Macquaria ambigua, G. callinani sp, nov. from Hypseteotris compressa and G. lomi sp. nov. from Maccullochella peeli , were found. Epieimeria anguillae and a Goussia sp. from Anguilla australis and A. reinhardti were recorded. These are the first records of coccidia from Australian fishes. 相似文献
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Abstract. The occurrence of Eimeria scardinii in roach, Rutilus rutilus (L.), and rudd, Scardinius erythrophthalmus (L.), from a lake in northern Greece is reported. The coccidium was found in the renal haemopoiettc tissue, mainly in the form of mature sporulated oocysts. The morphology and dimensions of the parasite, as well as the host reaction, were very similar in both species of fish examined. The overall prevalence of infection in roach and rudd was 6·67% and 6·3%, respectively. The prevalence of infection of roach was higher during summer (22·22%) but less than 5% in other seasons. 相似文献