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《中国兽医杂志》2020,(5)
为了解泰万菌素对鸡胚中鸡滑液支原体(MS)的治疗效果,本试验将鸡滑液支原体分别以10~(6.0)变色单位(CCU)和10~(5.0)CCU感染15日龄SPF鸡胚,并对感染后鸡胚注射泰万菌素和泰妙菌素,统计入孵蛋健雏率和孵化雏鸡肺脏感染情况。结果显示,无论MS以高剂量或低剂量感染SPF鸡胚,用药组入孵蛋健雏率均高于MS对照组,且MS+泰万菌素组效果优于MS+泰妙菌素组。对雏鸡肺脏支原体含量进行检测,MS对照组为2~(4.8±0.84)CCU/0.1 mL,用药组为2~(1.6)～2~(2.0)CCU/0.1 mL,二者差异显著。表明使用泰万菌素对被感染的种蛋进行治疗,可增加健雏率,减少雏鸡肺脏支原体含量,对种鸡场的净化有重要意义。 相似文献
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【目的】了解中国不同地区鸡毒支原体（Mycoplasma gallisepticum，MG）的流行和耐药情况，为禽支原体病的监测与防控提供科学依据。【方法】在广东、福建和安徽3个省份疑似MG感染的养殖场采集的43份气囊样品中分离培养和纯化MG流行菌株，并对其进行培养特性观察、生化及染色鉴定、血清学特异性鉴定、PCR测序分析、致病性试验和对常见抗菌药物敏感性试验。【结果】分离到3株疑似MG，均可使培养基颜色变黄，在固体培养基上呈典型"煎蛋"样菌落，可发酵葡萄糖，不水解精氨酸，不能利用尿素，符合MG培养特性。姬姆萨染色观察菌体形态、血清学特异性鉴定结果进一步证实分离株为MG。mgc2基因测序结果显示，3株分离株与强毒代表株亲缘关系更近。致病性试验结果显示，3株分离株与MG感染临床症状一致，发病率为70%~90%，致病力较强。药物敏感性试验结果显示，3株分离株均对恩诺沙星、替米考星、土霉素、氟苯尼考耐药，对泰万菌素和沃尼妙林均敏感，对大观霉素、金霉素、泰乐菌素和泰妙菌素的敏感性具有地域差异：福建株对大观霉素表现明显耐药，安徽株对泰妙菌素表现耐药，而广东株对大观霉素、金霉素和泰妙菌素均较敏感。【结论】本试验成功分离到3株MG，致病力较强，且均存在一定程度耐药，对药物的敏感程度有地区性差异，今后仍需加强各地区MG的药物敏感性监测，减少耐药性的产生与扩散。 相似文献
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旨在从广东某规模化鸡场死鸡胚进行鸡毒支原体(Mycoplasma gallisepticum,MG)的分离,并进行遗传进化分析、致病性及药物敏感性研究。本研究从广东某规模化鸡场的带菌死胚卵黄组织中分离禽支原体,通过菌落观察、血清学试验、16S rRNA支原体通用引物序列鉴定等方法,对分离的菌株进行种属鉴定,同时将分离的毒株对鸡胚和SPF鸡进行攻毒试验及抗菌药物敏感性试验。结果显示：显微镜下菌落呈典型的“荷包蛋”状。平板凝集试验显示其与MG阳性血清有凝集反应,与MS阳性血清不反应;16S rRNA序列测序发现各分离株与MG相似性达99.9%,因此确定分离株为MG。将各分离株感染7日龄SPF鸡胚,结果显示感染鸡胚大多于临近出壳时死亡;感染3周龄的SPF鸡,3周后解剖发现鸡气囊发生显著病理变化,说明其具有较强致病力;药物敏感性试验结果显示,5株分离株对盐酸沃尼妙林、多西环素、泰万菌素及泰妙菌素有较高敏感性,对替米考星、泰乐菌素、恩诺沙星、红霉素、吉他霉素、林可霉素呈现出不同程度耐药性。综上,从广东某规模化鸡场死鸡胚中成功分离到5株MG分离株,各分离株均可引起红细胞凝集,导致鸡胚死亡,对SPF... 相似文献
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《中国家禽》2016,(14)
为了解鸡毒支原体(MG)耐药情况,2013~2015年期间从山东不同地区分离鉴定了33株MG,并测定14种抗菌药物对具有明显血凝性的12株临床分离株的最低抑菌浓度(MIC)。通过构建的16 S r DNA系统进化树分析,临床分离株与MG S6亲缘关系最近。药物敏感试验结果显示,盐酸沃尼妙林、延胡索酸泰妙菌素、强力霉素敏感性最高,MIC平均值分别为0.028、0.167和0.29μg/m L,其次是盐酸大观霉素、水溶性氟苯尼考、酒石酸泰乐菌素、盐酸左氧氟沙星、盐酸恩诺沙星,MIC平均值在2.5~10μg/m L之间,而对盐酸林可霉素、水溶性阿奇霉素、乳酸诺氟沙星、硫酸丁胺卡那霉素、磷酸替米考星、酒石酸吉他霉素敏感性较低,MIC平均值在20~160μg/m L之间。 相似文献
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《中国兽医学报》2018,(11)
为了探究藏鸡鸡毒支原体(MG)的生物学特性,采用分离培养法对疑似慢性呼吸道病(CRD)藏鸡气管进行了MG分离纯化,根据菌落形态、鸡红细胞吸附试验、生长抑制试验和PCR进行鉴定,利用微量法测定了分离株对临床常用抗菌药物的敏感性。结果表明;从30份样本中仅分离到3株符合MG特征,分别命名为ZJ-1、ZJ-2和ZJ-3;通过MG 16srRNA序列比对,证实3株分离株均为与S6和HS株亲缘关系较近的较强毒力致病性MG;对试验用抗菌药物的敏感性较为一致,即对泰妙菌素、泰乐菌素、氟苯尼考、强力霉素、氧氟沙星、恩诺沙星、环丙沙星、林可霉素、庆大霉素均高度敏感;对红霉素中度敏感;对土霉素不敏感,但未发现高度耐药现象。证实了藏鸡群中存在致病性MG流行,且毒力具有增强趋势,临床中可使用泰乐菌素、强力霉素等高度敏感药物进行防治。 相似文献
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鸡毒支原体(MG)是一种缺乏细胞壁的革兰氏阴性菌,又被称为鸡败血支原体、鸡败血霉形体等.对于MG的治疗,现阶段常用大环内酯类药物,其中泰乐菌素在临床上是应川最普遍的药物.然而文献资料表明[1],MG极容易产牛耐药性,对红霉素和泰乐菌素能很快产生高水平耐药性,对恩诺沙星的耐药性较慢产生,而对土霉素和泰妙菌素的耐药性产生最慢.据于MG对土霉素的耐药性产生速度较慢,并且土霉素和其他治疗支原体的药物没有交叉耐药性.因此,本文选用土霉素注射液为治疗药物,以研究其对京白鸡MG的治疗效果. 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引：1，自引：0，他引：1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献
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Meschan EM Peham C Schobesberger H Licka TF 《Veterinary journal (London, England : 1997)》2007,173(3):578-584
As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks. 相似文献
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嗅源是军犬嗅觉作业训练的依据.军犬鉴别中嗅源能力的培养在整个鉴别训练中占有重要地位,关系到鉴别训练的成败和鉴别能力的提高.所以,军犬在嗅认嗅源时必须按照训犬员的指令充分、细致地感受嗅源气味,并且对嗅源气味产生兴奋反应.如何培养军犬充分嗅认嗅源以及及时解决嗅认过程中出现的问题,成为我们进行鉴别训练的关键.…… 相似文献
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Observations on the Pathology of the Spleen of the Cat 总被引：1，自引：0，他引：1
Abstract— Lesions were found in the spleen of four of sixty-three cats examined post mortem in the department, and comprised two examples of lymphosarcoma, one of chronic fibrinous peritonitis and one of subcapsular haematoma. Abnormalities were found in two cat spleens received from veterinary surgeons in general practice. In one cat the abnormalities were an haemangiosarcoma with secondary deposits in the liver and in the other extensive mast cell infiltration. In addition lesions were detected in the spleen of three of eighty-seven cats examined post mortem in general practice. The lesions were: multiple secondary deposits of adenocarcinoma from a primary tumour of the mammary gland, a ruptured spleen and a foreign body below the splenic capsule. Résumé— L'examen microscopique de soixante-trois chats pratiqué dans le service a permis de rencontrer quatre fois des lésions de la rate, dont deux lymphosarcomes, une péritonite capsulaire fibrineuse et un hématome sous-capsulaire. D'autre part des lésions ont été trouvées dans deux rates de chat expédiées par des vétérinaires exerçant en pratiaue générale. Chez un chat il s'agissait d'un htmangiosarcome avec métastases hépatiques et chex l'autre d'une infilt ation diffuse par des mastocyta. De plus, on a rencontré des llésions dnas la rate de trois chats parmi quatre-vingt sept autopsies effectuées dans le cadre d'une clientèle génárale. Ces iésions étaient dés métastases multiples d'un adénocarcinome dont la tumeur primitive siègeait dam la glande mammaire, une rupture de la rate et un corps érangers sou capsulaire. Zusammenfassung— Läsionen der Milz wurden bei vier von dreiuiidsechzig in dieser hbteilung sezierten Katzen gefunden, und zwar in zwei Fällen ein Lymphosarkom, in einem Falle eine chron-ische fibrinöse Peritonitis und in einem ein subkapsuläres Hématom. Anomalien fanden sich auch in der Milz von zwei Katzen, die aus der tierxrztlichen Praxis eingesandt wurden. Bei der einen Katze war dies ein Hämangiosarkom mit Metastasen in der Leber, bei der anderen eine weitläufige Infiltration der Mastzellen. Außerdem wurden bei drei von siebenundachtzig in der Praxis sezierten Katzen Milzläsionen gefunden. Diese bestanden am multiplen Metastasen eines Adenokarzinoms der Brustdrüse, einer Milzzerreissung und einem Fremdkörper unterhalb der Milzkapsel. 相似文献