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王文诚 《畜牧兽医科技信息》2003,19(6)
鸭瘟、鸭病毒性肝炎是发生于鸭的急性传染病,鸭瘟是由鸭瘟病毒引起,鸭病毒性肝炎是由鸭肝炎病毒引起,由这两种病毒引起的传染病发病急、传播快、死亡率高,给养鸭业造成重大的经济损失。目前,国内已有鸭瘟疫苗和鸭肝炎病毒疫苗,但未见有鸭瘟、鸭肝炎二联苗研究的相关报道,此二联苗 相似文献
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鸭疫里默氏杆菌病的发病特点与防治 总被引：2，自引：0，他引：2
鸭疫里默氏杆菌病是由鸭疫里默氏杆菌（Riemerella anatipestifer，RA）引起的雏鸭的一种急性或慢性的接触传染性疾病。该病又称为鸭传染性浆膜炎、新鸭病、鸭败血症、鸭疫综合征、鸭疫巴氏杆菌病等。主要侵害1～8周龄的幼鸭，尤以2～3周龄的雏鸭最易感，常引起大批幼鸭发病和死亡。 相似文献
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乌嘴鸭是我国唯一集药用、保健及膳食于一体的鸭种,具有口味独特、繁殖力强、适应性广、耐粗饲等特点。但由于其体形小、生长速度慢,制约了乌嘴鸭的开发利用。为充分挖掘该品种的资源优势,在加强其自身选育的同时,我们选择樱桃谷肉鸭与之进行正反交试验,探索一种简捷快速的利用乌嘴鸭资源的方法。现将主要试验结果报告如下:1材料与方法1.1杂交亲本的选择与分组试验用乌嘴鸭为17周龄种鸭,樱桃谷种鸭为26周龄父母代种鸭,试验按樱桃谷种鸭(♂)×乌嘴鸭种鸭(♀)、乌嘴鸭(♂)×樱桃谷种鸭(♀)、樱桃谷种鸭(♂)×樱桃谷种鸭(♀)、乌嘴鸭种鸭(♂)×… 相似文献
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近几年来,急性鸭病的发生不但给广大畜牧兽医工作者临床诊断带来了困难,而且还给养殖场造成不必要的经济损失。现将急性死亡的鸭传染病的鉴别诊断总结如下。一、外观鉴别要点1.鸭霍乱、鸭副伤寒使鸡鸭都发病。2.鸭瘟、鸭病毒性肝炎仅发病于鸭。鸭瘟的成鸭发病多于幼鸭,鸭病毒性肝炎的雏鸭发病多于成鸭。 相似文献
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李均 《养殖与饲料．饲料世界》2015,(2):55-56
<正>在进行鸭养殖过程中,由于各种原因易出现疫病情况,常见的有鸭慢性呼吸道病、鸭丝虫病、鸭大肠杆菌病等。为有效控制疾病的暴发和流行,减少鸭养殖户的经济损失,本文对常见的3种疫病进行防治分析。1鸭养殖过程中常见疫病鸭养殖过程中较为常见的疫病有3种,即鸭慢性呼吸道病、鸭丝虫病和鸭大肠杆菌病。其中鸭慢性呼吸道病即鸭窦炎,发病率较高,疾病传染源为带菌鸭和病鸭,通过呼吸道传染。而导致该病的主要原因为空气混浊、育雏舍温度较 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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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
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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