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湖南某猪场去年8月中份开始保育仔猪发病,临床症状表现猪群食欲下降、发热,呼吸急促、全身体表发红等．发病期间采用抗应激、抗感染措施,可缓解疫情,但下一批保育仔猪还会出现同样的疫情。同年10月初通过对母猪和仔猪血清学检测和病原检测,母猪的蓝耳病抗体阳性率仅为44．4％、阴性率56．6％、25日龄仔猪蓝耳病抗体阳性率12．5％、阴性率87．5％,60日龄仔猪蓝耳病抗体阳性率100％;病原RT-PCR检测结果发现在保育猪血液中存在蓝耳病毒感染。经了解该猪场去年5月中旬以前对种猪群进行蓝耳病疫苗接种。商品猪没有接种蓝耳病疫苗,而血清学检测,仔猪从哺保育初期到后期蓝耳病抗体阳性率显著上升,说明其间感染了蓝耳病毒。结合病原RT-PCR检测结果,确诊这次猪的疫情是蓝耳病感染引起的一次猪疫情。 相似文献
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猪圆环病毒病是由猪圆环病毒引起猪的一种传染病,主要感染8～13周龄猪,其特征为体质下降、渐行性消瘦、腹泻、呼吸困难。笔者主要通过对本市某猪场保育猪发病情况、流行病学、临床表现及PCV-2血清抗体检测,确定该场保育猪发生了猪皮炎与肾病综合征,后经加强饲养管理、卫生消毒、减少应激、控制继发感染等措施,该病得以控制。 相似文献
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猪的保育阶段是养猪过程中的一个重要的阶段,断奶应激对猪来说是最大的应激。由于断奶和环境的变化,保育猪的免疫机能有所降低。因此,保育这一关过不好,对猪的整个生长肥育过程都有影响。生产中常出现的问题是保育阶段易暴发传染病,给猪场造成巨大的经济损失。或者是虽然没有发生传染病,但猪群的均匀度差,残次率高, 相似文献
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2007年7月10日江苏省淮安某规模化猪场保育猪发生了一起以体温升高,两耳、背腹部、后躯等部位发绀,渐进性消瘦,全身淋巴结肿大、出血等为主要特征的传染病,经流行病学调查、临床诊断、病理剖检和实验室检测,确诊为猪蓝耳病变异株、 相似文献
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在漯河市某养殖场随机选取2栋(保育13和保育17)健康状况良好的保育猪进行猪蓝耳病(PRRS)疫苗不同免疫剂量的效果试验,每栋舍中猪只随机分为四组(A、B、C、D组),分别免疫不同剂量的蓝耳病疫苗。每组猪群均随机选取15头仔猪标记,分别在免疫前、免疫后7、14、21、28 d进行采血,采用酶联免疫(ELISA)检测试剂盒检测PRRSV抗体水平。结果显示,猪群首次免疫蓝耳病疫苗后第2周抗体水平达到高峰,之后有所下降;不同剂量的疫苗免疫,猪群整体抗体变化趋势一致,说明低剂量的蓝耳病毒即可引起猪群的感染。 相似文献
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猪伪狂犬病是危害规模化养猪场的主要传染病之一,为了解河南新乡某规模化猪场猪伪狂犬病(PR)的防控情况,对猪场内的健康猪群进行猪伪狂犬病gE基因缺失疫苗免疫,采用酶联免疫吸附试验(ELISA)对免疫猪群体内的猪伪狂犬病gE抗体水平进行检测分析。由试验得出,母猪妊娠初期猪伪狂犬病gE抗体阳性率为90%,妊娠中期和后期达到100%;哺乳期仔猪也达到了100%;5～6周龄保育猪伪狂犬病gE抗体阳性率为70%;7～8周龄保育猪抗体阳性率为50%;9～10周育肥猪抗体阳性率为40%。由试验可知,该猪场母猪妊娠期和哺乳斯感染猪伪狂犬病毒严重,保育期猪只疫情逐渐减少,育肥期疫情得到有效控制。建议长期检测猪伪狂犬病抗体,逐步淘汰阳性母猪,培养阴性后备猪群。对规模化猪场进行猪伪狂犬病抗体水平检测,可以更好地了解猪场的免疫效果,对促进养猪场经济平稳运行有积极作用。 相似文献
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采用进口ELISA试剂盒检测规模猪场母猪、保育猪血清中猪瘟、猪蓝耳病、猪伪狂犬病和猪圆环病毒病等的抗体水平.结果表明,被检测规模猪场的猪瘟抗体合格率为65.2%,特别是保育阶段仔猪抗体水平比较低,只有55.3%.伪狂犬病野毒抗体阳性率达19.01%,母猪与保育猪之间差异不大;而伪狂犬病gB抗体阳性率母猪可达92.6%,保育仔猪只有80%.PRRS抗体水平母猪与仔猪之间差异不显著,分别为88.4%和85.9%,这些场都有注射PRRS弱毒苗,说明该疫苗免疫后抗体转阳率比较高.圆环病毒2型的抗体检测阳性率达91.2%. 相似文献
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为了解河南省新乡市某规模化猪场猪瘟疫苗的免疫抗体水平,本试验采用猪瘟疫苗抗体阻断ELISA检测试剂盒,对该猪场不同日龄的保育猪、妊娠母猪、后备母猪及公猪进行猪瘟抗体水平检测。结果显示:妊娠中后期母猪的抗体阳性率均为100%,离散度分别为16.13%、17.01%,离散度相对稳定,免疫效果好。后备母猪、哺乳母猪抗体阳性率达100%,离散度分别为0.65%、8.80%,相对偏低,免疫效果好,猪群比较稳定。公猪的整体抗体阳性率为100%,猪场3个区中公猪的抗体离散度分别为3.23%、3.51%、6.11%,公猪免疫效果好且抗体整齐度高。保育仔猪前期的猪瘟抗体阳性率最高达100%,保育中期抗体阳性率最低,为50%,保育后期抗体阳性率是80%,保育中后期离散度分别为24.77%、32.98%,离散度相对不稳定,免疫水平不均一,存在感染野毒的风险,不同个体间抗体水平差异比较大。结合试验猪场具体情况,在保育猪30～55日龄之间再检测,确定仔猪的最佳首免时间,提高仔猪的免疫效果。本文通过对某规模化猪场不同阶段猪群的猪瘟抗体水平检测分析,为该猪场生产中防控猪瘟提供理论依据。 相似文献
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应用猪圆环病毒2型抗体酶联免疫检测试剂盒,测定了青海省省内8个猪场的1 000个血清样本,对不同地区、不同年龄猪的进行了血清学调查.结果显示,青海省8个猪场均有猪圆环病毒2型( PCV-2)感染,全省猪的PCV-2感染的平均血清阳性率为25.9％,其中母猪、种公猪、生长育肥猪、保育猪及哺乳仔猪抗体阳性率分别35.3％、... 相似文献
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The effects of pelleting and storage of a complex nursery pig diet (28% lactose and 1.4% lysine) on lysine bioavailability were assessed in a chick bioassay. The nursery diet was steam-conditioned at 60 degrees C for 45 s and then pelleted through a 5-mm die with a depth of 38 mm. Samples of meal and pelleted diet were placed in metallic feeders in an occupied nursery facility for 1 wk (warm) or were stored at 4 degrees C (cool). For the standard-curve bioassay, a total of 144 8-d-old chicks were offered the following dietary treatments: 1 to 3) a basal diet (lysine deficient) and two levels (.08 and .16%) of added lysine (from L-lysine-HCl); 4 and 5) two positive controls (.7% added lysine with or without 10% of the nursery diet); and 6 to 9) basal diet plus 10% of one of the four nursery diet samples (meal or pellet stored cool or warm for 1 wk). Pelleting had no effect (P>.10) on lysine bioavailability, probably because pelleting conditions (temperature, humidity, and pellet size) were not aggressive enough to result in detectable effects on lysine utilization. However, storage in the nursery facility for 1 wk reduced (P<.03) lysine bioavailability by an average of 10%. No significant (P>.10) interactions were observed. Furthermore, true digestibility of lysine in the four pig diet samples was estimated in a cecectomized cockerel digestibility assay using 15 adult Single-Comb White Leghorn cockerels. Lysine digestibility in all samples was high (average of 94%) and was not affected (P>.10) by treatment. We conclude that the pelleting conditions used in our experiments did not decrease lysine utilization. More research is needed to define thermal processing conditions that might cause protein quality deterioration. However, typical warm and humid environmental conditions encountered in modern nursery facilities have a negative effect on protein quality of diets rich in reducing sugars and lysine. 相似文献
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Diarrhea in growing-finishing swine. 总被引：1，自引：0，他引：1
R W Wills 《Veterinary Clinics of North America: Food Animal Practice》2000,16(1):135-161
Regardless of the etiology of an enteric disease in nursery age to finisher swine, making a prompt and accurate diagnosis is crucial. Eliciting a complete history, assessing clinical signs and pathology, and selecting and interpreting laboratory tests are essential components in achieving this. Early detection and diagnosis of enteric disease is particularly critical in the nursery through finisher phase because of economic impacts. Recurrent topics when discussing control and prevention of enteric diseases are reducing stress and improving pig comfort and reducing or eliminating exposure through sanitation and biosecurity. These are not new concepts; in fact, prior to the advent of antimicrobials, they were the mainstay of treatment of enteric diseases. With concern over the use of antimicrobials in food animal production increasing, exploiting disease ecology to control enteric diseases is increasing in importance. New vaccines and bacterins for postweaning swine enteric diseases are needed tools to exploit the pig's immune system. Recent advances in diagnostic capabilities allow an increase in understanding and exploitation of disease ecology. 相似文献
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猪细小病毒7群(Porcine parvovirus 7,PPV-7)是2016年首次从美国猪群发现和鉴定的新的猪细小病毒。为弄清我国猪群中是否存在PPV-7,本文用PPV-7特异性的实时荧光定量PCR和常规PCR方法对采集的10份猪流产胎儿和10份保育仔猪病料分别进行检测,结果发现其中1份保育仔猪样品的常规PCR和实时荧光定量PCR检测结果均为阳性,常规PCR扩增出的246 bp特异性条带测序和分子遗传演化时发现,该序列与PPV-7参考毒株KU5637332和KY996757的同源性分别为99.6%和98.0%,表明该样品中含有PPV-7,进一步用PK-15细胞分离病毒,连续传代5次后PK-15细胞都没有出现典型的细胞病变,但其上清液用实时荧光定量PCR方法都可以检测到该病毒。本研究结果证实我国猪群中存在PPV-7的感染,且检测到的PPV-7毒株能在PK15细胞中增殖。 相似文献
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Brumm MC Ellis M Johnston LJ Rozeboom DW Zimmerman DR;NCR- Committee on Swine Management 《Journal of animal science》2001,79(8):1967-1972
Two experiments were conducted to evaluate the possible interaction of nursery space allocations and grow-finish space allocations in swine. In Exp. 1, crowding was achieved by varying the number of pigs per pen. During the nursery phase, decreasing the space allocation (0.16 m2/pig vs 0.25 m2/pig; 8 and 12 pens per treatment, respectively) by increasing the number of pigs per pen (18 vs 12) resulted in a decrease in daily feed intake (0.609 vs 0.683 kg/d; P < 0.001) and daily gain (0.364 vs 0.408 kg/d; P < 0.001). Pigs were mixed within nursery treatment groups and reassigned to grow-finish pens (6 pens per treatment) at the end of the 35-d nursery period providing either 0.56 m2/pig (14 pigs/pen) or 0.78 m2/pig (10 pigs/pen). Crowding during the grow-finish phase decreased daily feed intake (P < 0.003) and daily gain (P < 0.001). In Exp. 2, space allocations of 0.16 m2/pig vs 0.23 m2/pig during the nursery phase (24 pens per treatment) resulted in a decrease in daily feed intake (0.612 vs 0.654 kg/d; P < 0.005) and daily gain (0.403 vs 0.430 kg/d; P < 0.001). Pigs remained in the same (social) groups when moved to the grow-finish phase. Unlike Exp. 1, there was no effect of crowding during the grow-finish phase (0.60 m2/pig vs 0. 74 m2/pig) on daily feed intake or daily gain. The difference in results between experiments suggests that the response to crowding during the grow-finish phase may depend in part on whether pigs are mixed and sorted following movement from the nursery. 相似文献
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2019年11月底,湖北某商品猪场保育猪只出现厌食、消瘦、呼吸困难、咳嗽等症状,偶有病猪急性死亡,为查找病因,控制疫情,减少损失,依次通过流行病学调查、病理剖检和实验室检测,最终确定该发病猪场为感染猪瘟病毒,进而继发感染Hps-4混合感染,并伴随蛔虫感染导致。通过筛选敏感药物治疗,优化生产管理,成功控制了此次疫情。该案例对此次疫情进行了分析总结,就加强生物安全建设,优化养殖管理,实现生产质量可控提供了参考建议。也为猪瘟混合感染呼吸系统细菌性疾病的防控提供参考。 相似文献
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规模化种猪场猪瘟免疫情况调研 总被引：3，自引：0，他引：3
猪瘟是由猪瘟病毒引起的一种以高热、出血为主要特征的烈性、高度接触性传染病,至今仍在中国广泛流行。接种疫苗是防控该病发生的最根本的方法,为了查清山西省规模化种猪场猪瘟疫苗免疫情况,课题组采用ELISA试剂盒,对8个地市42个规模化种猪场465头哺乳猪、456头保育猪、436头育肥猪、419头母猪进行了猪瘟免疫抗体检测。查明了哺乳猪抗体阳性率平均为70.11%,保育猪抗体阳性率平均为40.57%,育肥猪抗体阳性率平均为50.22%,母猪抗体阳性率平均为69.69%,证明被检猪群免疫抗体不理想,尤其是保育猪抗体水平较低。同时对12个规模化种猪场,4类不同免疫方法免疫猪瘟疫苗的133头哺乳猪、110头保育猪、105头育肥猪、135头母猪进行了免疫抗体检测。结果表明:乳猪在吃奶前超免猪瘟高效细胞苗6头份,21日龄时二免猪瘟高效细胞苗4头份,60日龄三免猪瘟高效细胞苗2头份,母猪产后21 d跟胎免疫效果最好,使保育猪免疫抗体阳性率达到89.29%,有些猪场使用该方法免疫后,使保育猪的死亡率有了明显的降低,生长发育逐渐走向正常;而采用仔猪在断奶后28日龄至35日龄时首免猪瘟普通细胞苗4头份,60日龄二免猪瘟普通细胞苗2头份,母猪产后28 d跟胎免疫的方法效果最差,不宜推广应用。通过对山西一些规模化种猪场猪瘟免疫情况的调研,基本查清了规模化种猪场猪瘟免疫效果和最佳免疫方法,可为养猪场防控猪瘟提供依据。 相似文献
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为掌握酒泉市五个农业县猪圆环病毒2型（PCV2）和3型(PCV3)流行情况,在辖区内不同区域、不同养殖规模、不同生长阶段的19个规模化养殖场、38个散养户、4家屠宰场采集血清样品230份、粪便样品250份、猪肺脏、扁桃体、颌下淋巴结等组织样品220份,进行PCV2和PCV3核酸检测,检出阳性样品138份,阳性率为21.23%,PCV2的阳性率为15.54%,PCV3的阳性率为5.69%,表明PCV2的流行比PCV3更普遍、阳性感染率更高,但在不同区域、不同规模猪场的危害程度和流行情况存在一定的差异。规模养殖场的总体阳性感染率明显低于散养户,保育猪的感染率高于其他生长阶段的生猪。本次实验对酒泉市猪场PCV感染综合防控提供技术支撑,为科学养猪产生积极影响。 相似文献