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1.
研究了马立克氏病肿瘤细胞系（ＭＳＢ－１）培养物上清液对体内鸡马立克氏病病毒（ＭＤＶ）增殖的影响，结果表明，该上清液对体内ＭＤＶ的增殖无明显抑制作用；相反，可增加ＭＤ的发病率。另外，试验中发现，６日龄鸡对ＭＤＶ的易感性明显高于１日龄鸡。  相似文献   

2.
MSB—1培养物上清液对体内MDV作用的研究   总被引：1，自引：0，他引：1  
研究了马立克氏病肿瘤细胞系（ＭＳＢ－１）培养物上清液对体内马立克氏病病毒（ＭＤＶ）增殖的影响，结果表明，该上清液对体内ＭＤＶ的增殖无明显抑制作用，相反，可增加ＭＤ的发病率，另外，试验中发现，６日龄鸡对ＭＤＶ的易感性明显高于１日龄鸡。  相似文献   

3.
致病性马立克氏病病毒的污染与监测   总被引：2，自引：0，他引：2  
马立克氏病（ Ｍａｒｅｋ’ｓ ｄｉｓｅａｓｅ，ＭＤ）是危害世界养禽业最严重的病毒性肿瘤性传染病。ＭＤ经羽毛囊排毒，空气传播，传染力极强，是鸡的三大主要疫病之一，可造成重大的经济损失。该病的致病因子为马立克氏病病毒（Ｍａｒｅｋ’ｓ ｄｉｓｅａｓｅｖｉｒｕｓ，ＭＤＶ），属疱疹病毒科成员，根据其嗜淋巴细胞性相似于γ－疱疹病毒，而其基因组结构却相似于α－疱疹病毒［１］。 ＭＤＶ按其致病性和血清学反应不同分为三个血清型：血清Ｉ型（ＭＤＶＩ）包括致瘤致病性的强毒株（如 ＨＰＲＳ－ １７、ＧＡ、Ｍｄ／５、ＢＪ－１）…  相似文献   

4.
鸡马立克氏病及其预防   总被引：9，自引：0，他引：9  
鸡马立克氏病及其预防崔治中（扬州大学农学院动医系扬州２２５００９）自１９６７年发现鸡马立克氏病病毒（ＭＤＶ）以来，已有整整３０年了。在这期间，人类未能消灭ＭＤＶ，但ＭＤＶ也未能毁灭养鸡业。然而，这３０年的共存却并不是平和的。１疫苗在不断发展，ＭＤＶ也...  相似文献   

5.
马立克氏病基因工程苗可行性研究吴贤福，蔡宝祥（南京农业大学动物医学院２１００９５）近年来，由于马立克氏病强毒（ｖＭＤＶ）和超强毒（ｖｖＭＤＶ）的出现，使临床免疫过ＨＶＴ的鸡仍然发病，故有必要从免疫学角度反思ＭＤ防制问题。ＭＤ的免疫与免疫抑制同时并存，...  相似文献   

6.
鸡马立克氏病的现状及其防制   总被引：1，自引：0，他引：1  
张知良 《中国家禽》1998,20(8):39-40
鸡马立克氏病（ＭＤ）是一种由疱疹病毒引起的具有高度传染性的肿瘤性疾病。我国于１９７３年首次发现ＭＤ,１９７８年开始生产用于预防ＭＤ的火鸡疱疹病毒（ＨＶＴ）疫苗。对有效地控制ＭＤ起了很大作用。鸡马立克氏病毒（ＭＤＶ）１９６７年发现至今已有３０年,由于病...  相似文献   

7.
马立克氏病研究的新进展——第五届国际马立克氏病会议介绍刘秀梵（扬州大学农学院２２５００９）第五届国际马立克氏病（ＭＤ）会议于１９９６年９月７日至１１日在美国密西根州立大学（ＥａｓｔＬａｎｓｉｎｇ）举行，密西根州立大学微生物系教授ＬｅｅｌａｎｄＶｅｌｉ...  相似文献   

8.
雏鸡ＨＶＴ疫苗免疫后ＳＯＤ活性的变化＊迟玉杰李庆章（东北农业大学动物医学系，哈尔滨１５００３０）于洪祥（哈尔滨原种鸡场）在马立克氏病（ＭＤ）及其疫苗免疫的国内外研究中，马立克氏病病毒（ＭＤＶ）的分子生物学及病原诊断、疫苗研制及应用、ＭＤ病理等方面已取...  相似文献   

9.
５种马立克氏病疫苗免疫效力的对比试验张建伟杨彦明周蛟（北京市农林科学院畜牧兽医研究所，１０００８１）自７０年代，研制出ＨＶＴ冻干疫苗并用免疫预防以来，马立克氏病（ＭＤ）的发生得到了很好的控制。几年后ＭＤ免疫失败就开始见有报道。８０年代又分别应用了改进...  相似文献   

10.
鸡马立克氏病疫苗研究和使用现状   总被引：3，自引：0，他引：3  
鸡马立克氏病（ｍａｒｅｋ＇ｓＤｉｓｅａｓｅ,ＭＤ）是鸡的三大主要传染病之一,是由马立克氏病病毒（ＭＤＶ）引起的。以淋巴细胞增生为特征的恶性传染病,对养鸡业危害极大。据统计,仅１９８６年一年,世界各地所有鸡群由ＭＤ引起的直接或间接损失就在９亿美元,我国...  相似文献   

11.
试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。  相似文献   

12.
Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal (GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April 2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes. But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia.  相似文献   

13.
Tropical Animal Health and Production -  相似文献   

14.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

15.
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.  相似文献   

16.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

17.
Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded.  相似文献   

18.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

19.
The objective of this report was to characterize 20-year changes in proportion of calcium oxalate (CaOx) calculi and struvite calculi in dogs, and associations with breed, age, and sex. In this retrospective study, results of analysis of urinary calculi from dogs were reviewed for specimens received between July 1, 1981, and December 31, 2001. Breed, sex, age, year of submission of the specimen, and mineral type(s) were analyzed statistically. CaOx or Struvite or both were contained in 18,966 of 20,884 (91%) specimens. For both sexes, a 20-year statistically significant increase was observed in the proportion of calculus specimens that contained CaOx. The increase in this proportion was greater in females (1% to 31%) than in males (18% to 82%). From 1998 to 2001, when proportions may have plateaued, the odds of specimens containing CaOx were markedly higher in 18 breeds, markedly lower in 5 breeds, and not significantly different in 13 breeds compared with crossbreds. For both sexes, a 20-year statistically significant decrease was observed in the proportion of calculus specimens that contained struvite. This decrease in proportion was greater for males (79-16%) than for females (97-68%). From 1998 to 2001, when proportions plateaued, the odds of calculi containing struvite were markedly lower in 20 breeds, markedly higher in 1 breed, and not significantly different in 15 breeds when compared with crossbreds. Breed, age, and sex were associated statistically with CaOx or struvite urolithiasis. In conclusion, there appears to have been a long-term increase in the proportion of specimens of canine urinary calculi that contain CaOx as well as a long-term decrease in the proportion of specimens of calculi that contain struvite for both male and female dogs. The rate of change appeared to begin leveling off in the period 1998 to 2001. The recent proportion of dogs with either CaOx- or struvite-associated urolithiasis may depend on breed, age, and sex, and on interactions among these 3 factors.  相似文献   

20.
<正>1.INTRODUCTION Ensuring transportation network security is one Of the most daunting challenges confronting homeland security agencies today.Significant research has been dedicated.To model and analyze the vulnerability of transportation systems,while notably fewer studies propose specific strategies for deploying defensive technologies to safeguard these systems.  相似文献   

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