冬春季节新生羔羊腹泻的原因与防治

羔羊腹泻病主要危害7日龄以内的羔羊，其中以2-3日龄的羔羊发病较多，每年产羔季节都有羔羊死亡，给养殖户带来了一定的经济损失，对养羊业危害较大。羔羊腹泻病病因较多，给防治工作带来了一定的难度，为有效防止该病发生，养殖户应重视引发羔羊腹泻的因素，采取综合措施进行防治。     

引起羔羊腹泻的原因及预防措施

正随着人们生活水平的提高,最近几年,养羊业得到了快速发展,越来越来的养殖户把目光投向了养羊业,如何提高养羊业的经济效益,首先一定要提高羔羊的成活率,羔羊腹泻病是引起羔羊死亡的最常见的疾病之一,因羔羊很容易得此病,死亡率较高,并且该病病原比较复杂,不分季节,一年四季均可发病,并且危害程度较大,因此如何采取有效的防治措施减少并控制羔羊腹泻病,对养羊户来说至关重要。1引起羔羊腹泻病原因1.1羔羊的生存环境条件不是很好,产羔圈舍简陋,     

羔羊腹泻病的病因分析及防治

腹泻病是羔羊常发的消化道疾病,严重影响羔羊的生长发育及成活率。导致羔羊发生腹泻的原因非常复杂,主要对引起羔羊腹泻的可能原因作一分析,并提出具体的预防和治疗措施,以期为临床有效防治羔羊腹泻病提供参考。     

引起羔羊腹泻的原因及防治措施

<正>羔羊腹泻病是引起羔羊死亡的最常见的疾病之一,因羔羊很容易得此病,死亡率较高,并且该病病原比较复杂,不分季节,一年四季均可发病,危害程度比较大,因此如何采取有效的防治措施减少并控制羔羊腹泻病,对养羊养殖企业(场、户)来说至关重要。1致病的原因1.1羔羊圈舍的卫生条件差产羔圈舍比较简陋,不能确保夏季凉爽,冬季保温,从而导致圈舍内温差波动较大,圈舍不干净卫生,太潮湿等,都容易引起羔羊腹泻。     

羔羊腹泻的原因与防治方法

羊腹泻病是一种消化道疾病,也是目前规模养羊场的多发病,该病会严重影响羊只的发育,重者会引起养只的死亡。本文主要分析了引发羔羊腹泻病的原因,并提出了一些防制方法,以期为研究及防治该病提供参考。     

羔羊腹泻的综合防治

羔羊在成长过程中极易感染腹泻病,该病不受季节变化的影响,感染的原因也较多。本文总结了引起羔羊腹泻的发病原因(病原微生物引起的原发或继发性腹泻、营养摄入和饮食引起的腹泻、外界环境卫生不良引起的腹泻),并提出了加强饲养管理和环境卫生消毒,合理饲喂、供足营养,加强怀孕母羊的营养和及时治疗病羊等防治措施,以期提高羔羊的存活率和促进羔羊发育,保障广大养殖业的经济利益不受侵害。     

羔羊腹泻病的防治

作者在分析羔羊腹泻病发病原因和发病机制的基础上,总结了其症状和诊断方法,并提出了有效的预防治疗措施,以供同行参考。     

移多珍秦、歇武两乡羔羊腹泻病源诊断和与防治

羔羊腹泻病在家畜疾病中占有相当大的比例 ,查清病源、分布、危害程度、防治现状 ,对控制和扑灭羔羊腹泻病提高繁活率 ,加快玉树州养羊业的发展有着重要意义。因此 ,在州科委的支持下 ,分别在珍秦乡三、五、六村和歇武乡牧业村进行了羔羊腹泻的病原诊断、防治工作 ,现将情况报告如下 :1　基本情况1.1　根据珍秦、歇武两乡的实际调查 ,笔者认为发病原因是多方面的 ,如天气骤变、寒流的侵袭 ,使得羔羊易患腹泻 ,加之管理不善 ,母乳不足 ,营养不良等则使羔羊常常发病、死亡。根据调查 ,作者进行以羔羊腹泻病源诊断和防治工作。1.2　根据两乡的…     

羔羊腹泻的发病原因、临床症状与综合防治

羔羊腹泻病,是阻碍羔羊生长发育,引发羔羊死亡的主要杀手。因其病原复杂,危害较大,发病流行无明显的季节性和规律性可循,历年来一直为广大学者,畜牧兽医技术人员及养羊单位所关注。规模化全合饲羊场,羔羊是其经济收益的主要来源,因此,如何采取有效的综合防治技术减少或控制羔羊腹泻病,对规模化全舍饲羊场意义重大。     

羔羊腹泻的防治对策

介绍了发生羔羊腹泻的多种发病原因,并根据临床经验提出相应的防治对策和饲养管理措施,以期为防治该病提供参考。     

新生羔羊痢疾原因及防治

羔羊痢疾是新生羔羊群体中的常发病和高发病,属于急性毒血症和急性传染性疾病。临床上主要表现为剧烈腹泻,肠道严重溃烂。该种疾病主要危害7日龄内新生羔羊,随着年龄的增长,抵抗能力增强,羔羊痢疾的发生率呈现逐渐下降趋势。新生羔羊痢疾具有发病急、发病过程短、致死率高的特点,发生流行后如果不能及时诊断,及时采取措施进行防控,短时间内会造成大批量的羔羊死亡,给养殖场带来不可挽回的经济损失。该文主要论述新生羔羊痢疾的发病原因和防治措施,缩短发病周期,提高治疗效果。     

畜痢灵预防和治疗羔羊腹泻的效果

畜痢灵口服液预防羔羊２２５７只，腹泻１５０只，发病率６．６５％，对照组羔羊６２９只，腹泻１８１只，发病率２８．７８％；预防组死亡１３只，死亡率０．５８％，对照组死亡１４０只，死亡率２２．２６％，预防组成活率比对照组提高２１．６８个百分点。用畜痢灵口服液治疗羔羊１６５只，治愈１５８只，治愈率９５．７６％。     

Isolation of border disease virus from twin lambs in Alberta

We describe herein a field case of border disease (BD) in twin lambs. Both lambs were unthrifty, stunted, and one exhibited nervous signs characteristic of BD, with tremors of the head, neck, hind legs, and pelvis. Hairiness of the coat and excessive pigmentation, often seen in lambs with BD, were not observed. A noncytopathic virus, which showed cross-reactivity with bovine viral diarrhea (BVD) virus antiserum and BVD virus monoclonal antibodies, was isolated repeatedly from leukocytes from one lamb and from tissues of the other. Although the source of the virus is unknown, our results suggest that the dam of the affected twins had been infected during pregnancy. We used the BD virus isolated to inoculate pregnant ewes and experimentally reproduce the disease in a newborn lamb. Our findings indicate that leukocytes, rather than serum, should be utilized for BD virus isolation. Further, it is recommended that BD virus, rather than BVD virus, be used in serum neutralization tests when screening sheep for antibody titers.     

Fostering lambs by odor transfer: the add-on experiment

Lamb-specific odor is used by ewes to discriminate between their own and alien offspring. Recent studies have demonstrated that fostering can be facilitated by transferring own-lamb odor to alien lambs via cloth stockinettes. The objective of the present study was to investigate the effectiveness of the odor-transfer technique in enticing ewes with a single lamb to adopt an additional lamb ("add-on" procedure). Shortly after birth, nylon stockinettes were placed on the single offspring of 49 ewes and 49 additional alien lambs designated for fostering. Approximately 20 h following parturition, stockinettes were removed from 41 natural lambs and placed on alien lambs (experimental treatment). In the control treatment (eight ewes) own and alien lambs retained their own stockinettes. Four acceptance tests were conducted, 24 h apart, starting at the onset of fostering. Successful adoptions were attained for 21 of 31 experimental ewes (68%) exposed to add-on lambs similar in facial coloration to their own lambs. Only 2 of 10 experimental ewes (20%) with whiteface natural lambs adopted blackface add-on lambs. One of eight control ewes (12.5%) adopted an add-on lamb. Of the 24 ewes that adopted alien lambs 10 (41.7%) demonstrated immediate acceptance and 20 (83.3%) had adopted lambs by the second test day. A higher proportion of primiparous than multiparous ewes adopted alien lambs. The presence of own-lamb odor on stockinettes worn by add-on lambs appears to facilitate fostering. However, the presence of own-lamb odor may not be a significant-enough cue to override obvious differences in facial coloration between own and add-on lambs.(ABSTRACT TRUNCATED AT 250 WORDS)     

Research Progress on the Bacterial and Viral Etiology of Lamb Diarrhea

The etiology of lamb diarrhea disease is complex,however,bacterial and viral infection are the most critical factors and cause most serious harm.In order to explore the main pathogens of lambdiarrhea,many scholars and experts have undertaken extensive research on different aspects of viral and bacterial etiology of lamb diarrhea with various methods.Recently,the research about the etiology concentrates on the main code genes and functional proteins in the progress of pathogen invading host and molecular epidemiology.This paper reviewed the recent and main pathogens of lamb diarrhea caused by bacteria and viruses from the molecular level,and proposed some ideas about the development of etiology of lamb diarrhea in the future.     

羔羊腹泻细菌和病毒病原的研究进展

导致羔羊腹泻的因素多样,细菌和病毒感染是最关键的因素,其危害也最严重。已有很多专家、学者应用不同的方法对引起羔羊腹泻的病原开展了大量研究,旨在探明引起羔羊腹泻的主要病原。近年来,对病原的研究主要集中于病原主要编码基因和功能蛋白在致病过程中的作用及其分子流行病学。作者从分子水平将近年来导致羔羊腹泻的主要细菌和病毒病原进行综述,并据此为羔羊腹泻病原学发展提出看法。     

Coccidiostatic action of monensin fed to lambs: body weight gains and feed conversion efficacy.

Thirty crossbred ewe lambs weighing an average of 37.3 kg were allotted to 6 groups of 5 lambs each so that group weights were nearly equal. Lambs were fed dehydrated alfalfa pellets, initially at 1.14 kg/day and subsequently increased after experimental day 15 and 42. Each lamb was artificially infected with 18,000 sporulated oocysts of Eimeria ninakohlyakimovae. Groups 1, 2, 3, and 4 were given monensin in the form of medicated alfalfa pellets at dose levels of 5, 10, 20, and 30 g/metric ton, respectively. Groups 5 and 6 were infected controls (infected, nonmedicated). Lambs in groups 5 and 6 developed severe clinical coccidiosis, having diarrhea and losing weight rapidly. Group 1 lambs did not have diarrhea, but the lambs did not gain well. All other medicated lambs gained weight during the experimental period of 84 days. Feed conversion was good in medicated groups 2, 3, and 4 and was poor in control groups 5 and 6. Statistically significant differences in feed conversion and body weight gains (5 and 1% level of confidence) were observed between control and medicated groups.     

Factors affecting productivity of Rambouillet ewes mated to ram lambs

Objectives of this study were to estimate the magnitude of the effects of various factors associated with ewes and their ram lamb mates on fertility, prolificacy, lamb survival, lamb weaning weight and ewe productivity and to estimate the heritability and repeatability of each trait. Records from 731 ewe-years, 75 ram lamb sires and 616 lambs born from the University of Illinois Rambouillet flock were used. Ewes mated to single-born ram lambs had higher fertility rates (P less than .01), gave birth to lambs with higher survival rates (P less than .01), weaned lighter (P less than .05) individual lambs but weaned more weight of lamb per ewe exposed (P less than .01) than ewes mated to multiple-born ram lambs. Ram lamb breeding weight, ram lamb scrotal circumference, ewe breeding weight and ewe age had relatively large and positive effects on the composite trait of weight of lamb weaned per ewe exposed and significant effects on a number of the component traits. Heritability and repeatability estimates were, respectively, as follows: fertility, 3%, 3%; prolificacy, 34%, 19%; lamb survival, 15%, 8%; lamb weaning weight, 7%, 36%; and ewe productivity, 27%, 10%.     

绵羊的母性行为及其研究进展

 绵羊母性行为表达的差异能够影响羔羊的早期生长发育和存活,在分娩和哺乳期表现出低质量母性行为的母羊很难与羔羊建立起紧密的母-子联系,导致较高的羔羊死亡率。论文就绵羊母性行为表达、生理控制、影响行为表达的因素以及生产管理中的母性行为选择问题作一综述,为在生产实践中加强母性行为选育提供借鉴。     

羔羊不同生长时期饲养管理

羔羊作为养殖场的重要生产资料,其成活率直接影响养殖场经济效益,因此需要采取科学合理的养殖方法,促进羔羊健康生长。羔羊出生后,由于各个脏器器官未全面生长发育,外界应激因素较多,一旦养殖管理不当,都会造成疾病发生。某些传染性疾病的发生流行会在短时间内传播到整个羔羊群体中,引发剧烈发病,造成大面积死亡,给养殖户带来不可挽回的经济损失。该文主要分析羔羊不同生长发育阶段的饲养管理技术要点。