共查询到19条相似文献，搜索用时 522 毫秒
1.
根据鸡球虫病的特点,研究不同浓度水平的茶多酚(tea polyphenol)对未孢子化以及完全孢子化Emeria tenella球虫卵囊的作用效果;并通过在基础日粮中添加0.02%、0.04%和0.06%不同浓度水平茶多酚的肉鸡饲养试验,初步研究茶多酚抗E.tenella球虫的作用机制。结果表明,茶多酚具有明显抑制未孢子化E.tenella球虫卵囊成熟的作用,且茶多酚浓度越高,抑制效果越好;茶多酚对孢子化卵囊具有一定杀灭作用,并可提高肉鸡免疫器官指数,增强其免疫功能和抗炎作用,其中以添加0.04%茶多酚的试验效果较好。 相似文献
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外源性一氧化氮对鸡柔嫩艾美尔球虫的作用 总被引：3，自引：2，他引：1
用酸化亚硝酸钠作为一氧化氮(NO)供体处理新收取的柔嫩艾美尔球虫未孢子化和已孢子化卵囊,来探讨外源性NO对球虫卵囊的抑杀作用。另外通过内服亚硝基谷胱甘肽(GSNO)试验来观察外源性NO对球虫病的防治作用。结果表明,酸化亚硝酸钠溶液(pH=1)对球虫卵囊的孢子生殖具有明显的抑制作用,20mmol/L酸化亚硝酸钠溶液对卵囊孢子生殖的抑制率可达100%;但不经酸化的亚硝酸钠溶液和相同pH的盐酸溶液对卵囊的孢子生殖没有明显影响。经20mmol/L以上浓度酸化亚硝酸钠处理的孢子化卵囊也失去了对雏鸡的致病力,但直接内服GSNO溶液则没有明显的抗球虫作用。这提示外源性NO对鸡柔嫩艾美尔球虫未孢子化和孢子化卵囊均有抑杀作用,但直接内服没有明显的抗球虫病作用。 相似文献
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中草药对兔球虫卵囊孢子化的影响 总被引：1，自引：0，他引：1
为了解中草药对球虫卵囊孢子化的影响,将未孢子化斯氏艾美尔球虫卵囊分别在质量浓度为0.25g/mol、0.50g/mol、1.00g/mol的蒲公英、青蒿、白头翁、秦皮药物中进行孢子化,于第4、6、8天观察球虫卵囊的孢子化情况。结果表明,所用中草药对球虫卵囊的孢子化率有一定的抑制作用,白头翁的抑制效果最好,其中以青蒿的抑制效果最差。 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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中药抗柔嫩艾美尔球虫机制研究 总被引：19，自引：0，他引：19
根据中兽医理论和鸡球虫病的特点，用纯中药组方，经组方药效筛选试验，选用抗球虫效果最佳的组方进行抗球虫机制研究，结果表明，所选中药组方具有明显的抑制未孢子化柔嫩艾美尔球虫卵囊的成熟，对孢子化孵囊具有杀灭作用，并且使外周血液中淋巴细胞尤其是Ｔ淋巴细胞增多，提高免疫器官中Ｔ和Ｂ淋巴细胞的数量和活性，从而提高机体的免疫能力，证明了该组具有高效抗球虫效果。 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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《当代畜牧》2020,(4)
为了研究青蒿、秦皮这2种中草药不同质量浓度溶液对兔球虫卵囊孢子化的影响,笔者采用饱和食盐水漂浮法分离兔球虫卵囊,再将未孢子化的兔球虫卵囊分别置于不同质量浓度(0.25 g/m L、0.50 g/m L、1.00 g/m L)的青蒿及秦皮中药提取液中,28℃恒温连续培养5 d。每24 h在显微镜下观察兔球虫卵囊的孢子形成情况,计算兔球虫卵囊孢子化率。试验结果表明,2种药物对球虫卵囊孢子化均有抑制效果,但在相同时间、相同浓度时秦皮的抑制作用高于青蒿,且随着药物浓度的增加,对球虫卵囊的孢子化抑制效果也增强。5 d后抑制效果最好的是1.00 g/m L的秦皮,孢子化率为62%;抑制效果最差的是0.25 g/m L的青蒿,孢子化率为85%。 相似文献
9.
柔嫩艾美尔球虫和巨形艾美尔球虫混合感染致病性研究 总被引：1，自引：0，他引：1
材料和方法１．试验动物ＡＡ肉鸡，购自江苏省家禽研究所，出壳后运回实验室饲养在杀灭卵囊的笼具中至１５日龄，经数次粪检未见卵囊后供试验。２．球虫卵囊为本教研室分离鉴定的纯种柔嫩艾美尔球虫和巨形艾美尔球虫孢子化卵囊，４℃保存。３．试验分组挑选体况相近的１５日龄ＡＡ肉鸡５０羽，分成５组。第１组为不感染对照组；第２组为单种球虫感染组，每羽经口接种柔嫩艾美尔球虫孢子化卵囊１万个；第３、４和５组为混合感染组，每羽分别同时感染柔嫩艾美尔球虫和巨形艾美尔球虫孢子化卵囊：０．５＋５万、１＋１０万和２＋２０万个。４．… 相似文献
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《中国畜牧兽医》2018,(12)
为了筛选有效的球虫消毒剂,本研究将柔嫩艾美耳球虫卵囊分别与16种常用消毒剂和1种高效抗球虫药物溶液(250mg/L妥曲珠利溶液)混合作用2h然后在2.5%重铬酸钾溶液中孢子化培养,或混合作用4h后接种14日龄雏鸡,根据卵囊孢子化率、孢子化抑制率、每克粪便卵囊数量(oocysts per gram of feces,OPG)、病变计分和血便情况评价消毒剂和抗球虫药物抑杀球虫卵囊效果。结果显示,8%氨水对未孢子化卵囊和孢子化卵囊均表现为100%的抑杀效果;250mg/L妥曲珠利、3%甲醛、4%苯酚、0.5%过氧乙酸、5%NaOH+10%NaCl和5%NaOH对球虫卵囊活性具有一定的抑制作用,孢子化抑制率超过10%,但是对孢子化卵囊抑杀作用不明显;而剩余10种常用消毒剂对球虫卵囊没有明显的抑杀作用。氨水抑杀球虫卵囊条件优化的试验结果显示,1%～8%氨水与未孢子化卵囊作用1h以上,均可100%抑杀球虫卵囊活性。粪便干扰试验结果显示,粪便不影响2%和4%氨水对球虫卵囊的抑杀效果。本研究结果说明常用消毒剂和抗球虫药物不能有效杀灭球虫卵囊的活性,而氨水是一种高效球虫消毒剂。本研究结果可为开发新型高效球虫消毒剂和球虫病控制提供参考。 相似文献
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复方球虫散对人工感染鸡球虫病治疗效果的临床试验 总被引：4，自引：1，他引：3
为科学、客观地评价复方球虫散对实验性鸡球虫病的防治效果,采用人工接种柔嫩艾美耳球虫孢子化卵囊的方法复制鸡球虫病,使用纯中药组方复方球虫散进行鸡球虫病的临床疗效试验,观察并计算复方球虫散对试验鸡的死亡率、相对增重率、病变值和卵囊值的影响,并求出复方球虫散的抗球虫指数(ACI).试验结果表明:复方球虫散按1.0%拌料混饲,对鸡球虫病有较好的治疗效果. 相似文献
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柔嫩艾美尔球虫感染对鸡的若干生理生化指标的影响 总被引：9，自引：2，他引：7
以74只33日龄蛋公鸡作为试验对象,随机分成感染组(n=37)和对照组(n=37)。感染组每只口服接种1.5×10~5个柔嫩艾美尔球虫孢子化卵囊,分别于感染前(0d)和感染后(2,4,6,8d)将鸡处死,颈静脉采血,研究球虫感染对鸡生理生化指标的影响。结果表明柔嫩艾美尔球虫感染后鸡红细胞数、白细胞数、血红蛋白含量、血清中葡萄糖含量显著减少,血清钾含量显著升高,血清钠、血清钙、氯化物、无机磷都显著降低。血清镁含量也降低,但与对照组相比无统计学差异。 相似文献
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T K Jeffers 《Avian diseases》1978,22(1):157-161
Coccidia were propagated from litter samples obtained from broiler production flocks being medicated with monensin. Eimeria tenella was isolated from 48.9% of the litter samples from which coccidia were propagated. Tests of the monensin sensitivity of the 73 E. tenella isolants obtained revealed no monensin-resistant isolants. 相似文献
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利用从南宁市郊养鸡场球虫病鸡粪便中收集的球虫混合种卵囊感染小鸡,再应用单卵囊分离感染技术,从感染鸡盲肠中收集的卵囊分离纯化获得1株纯种球虫,经鸡体传代增殖,对该虫株的卵囊大小和卵形指数、潜在期、排卵高峰期、最短孢子化时间、寄生部位、致病性等指标进行观察和测定。结果测得该虫株卵囊的平均大小为(25.743±1.94126)μm×(21.4±1.85985)μm,平均卵型指数为1.2067±0.07;潜在期为140 h;其排卵囊峰期在第6～9天,最高峰在第7天;最短孢子化时间为19 h;寄生部位在盲肠;对两周龄的艾维茵鸡,当使用5×104的孢子化卵囊感染剂量时死亡率为7.5%。根据这些测定和观察到的指标综合鉴定该分离株球虫为柔嫩艾美耳球虫,并命名为柔嫩艾美耳球虫广西南宁株(Eimeria.tenella-GXNN),该研究结果为进一步研究本地区鸡球虫病的药物治疗和免疫预防等奠定了基础。 相似文献
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Effect of dietary supplementation with oregano essential oil on performance of broilers after experimental infection with Eimeria tenella. 总被引：3，自引：0，他引：3
I Giannenas P Florou-Paneri M Papazahariadou E Christaki N A Botsoglou A B Spais 《Archives of Animal Nutrition》2003,57(2):99-106
A study was carried out to examine the effect of dietary supplementation of oregano essential oil on performance of broiler chickens experimentally infected with Eimeria tenella at 14 days of age. A total of 120 day-old Cobb-500 chicks separated into 4 equal groups with three replicates each, were used in this study. Two groups, one infected with 5 x 10(4) sporulated oocysts of E. tenella and the other not, were given a basal diet and served as controls. The other two groups also infected with E. tenella were administered diets supplemented with oregano essential oil at a level of 300 mg/kg, or with the anticoccidial lasalocid at 75 mg/kg. Following this infection, survival rate, bloody diarrhoea and oocysts excretion as well as lesion score were determined. Throughout the experimental period of 42 days, body weight gain and feed intake were recorded weekly, and feed conversion ratios were calculated. Two weeks after the infection with E. tenella supplementation with dietary oregano oil resulted in body weight gains and feed conversion ratios not differing from the non-infected group, but higher than those of the infected control group and lower than those of the lasalocid group. These parameters correspond with the extent of bloody diarrhoea, survival rate, lesion score and oocyst numbers and indicated that oregano essential oil exerted an anticoccidial effect against E. tenella, which was, however, lower than that exhibited by lasalocid. 相似文献
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Broiler chickens in battery pens were either fed a diet containing 100 ppm lasalocid or no drug for 24 h prior to inoculation with sporulated oocysts of Eimeria tenella or Eimeria acervulina. Different groups of birds remained on medicated feed for 24, 48, 72, 96, 120 or 144 h after inoculation. Conversely, other groups started on an unmedicated diet, were given medicated feed at different times after oocyst inoculation. Starting lasalocid medication 24 h (E. tenella) or 48 h (E. acervulina) after inoculation reduced the lesions and improved the weight gain. There was no significant difference in performance of birds after withdrawal of the drug at 48 h (E. tenella) or 72 h (E. acervulina) and thereafter. Starting lasalocid medication at 96 or 120 h did not suppress but rather reduced oocyst production. 相似文献
17.
El-Abasy M Motobu M Na KJ Shimura K Nakamura K Koge K Onodera T Hirota Y 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(8):865-871
The effects of oral administration of sugar cane extracts (SCE) on Eimeria tenella oocysts infection in chickens were studied with 2 different experiments. In Experiment 1, 3-week-old inbred chickens (MHC; H.B15) were inoculated into the crop with SCE (500 mg/kg/day) for 1 day or 3 consecutive days, and then challenged with E. tenella sporulated oocysts (2 x 10(4) cells/chicken). In Experiment 2, 1-week-old chickens were orally administered SCE at the same dose for 3 consecutive days, and then initially infected with E. tenella sporulated oocysts (2 x 10(3) cells/chicken). At 2 and 3 weeks of age, these chickens were immunized intravenously with the mixed antigens of sheep red blood cells (SRBC) and Brucella abortus (BA). At 4 weeks of age, chickens were challenged with E. tenella sporulated oocysts (1 x 10(5)/chicken). Challenged chickens with E. tenella oocysts showed markedly decreased body weight gain/day, severe hemorrhage and great number of shedding oocysts in feces and high lesion scores. Oral administration of SCE and initial infection with oocysts (2 x 10 (3)/chicken) resulted in a remarkable improvement in body weight gain/day, hemorrhage, the number of shedding oocysts and lesion score, compare to other infected groups. In addition, SCE-inoculated chickens with the initial infection showed a significant increase in antibody responses against SRBC and BA and also improvement in decreased relative proportions of Bu-1a(+) and CD4( )cells in cecal tonsil lymphocytes of E. tenella-challenged chickens. Cecal tissues of chickens administered SCE and initially infected with E. tenella oocysts showed lower numbers of schizonts, gametocytes and oocysts than those of infected control chickens. These results suggest that SCE have immunostimulating and protective effects against E. tenella infection in chickens. 相似文献
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三株柔嫩艾美球虫野外分离株的致病性分析 总被引：1，自引：0，他引：1
用每鸡4×104和8×104个孢子化卵囊的剂量感染黄羽肉雏,以临床症状、肉眼病变、平均增重、病变记分和死亡率为判定指标,对柔嫩艾美球虫EtCZ-1、EtCZ-2、EtCZ-3株的致病性进行了比较分析。结果显示:各虫株引起的临床症状和肠道肉眼病变基本相似,致病性随着感染剂量的增加而增强。各感染组的增重与对照组相比均有显著差异(P<0.50),相对增重率分别下降了74.4%～83.2%、68.7%～72.2%和70.6%～74.4%;感染后鸡出现血便的时间较一致,即第108小时开始排血便,在120h～144h达高峰;病变值和卵囊值均随着感染剂量的增加而增大;除EtCZ-1株高剂量组的存活率是90%以外,其余各组均为100%。显示3株球虫的致病性相似。 相似文献