酶联免疫法检测饲料中呋喃唑酮含量的探讨

呋喃唑酮酶联免疫反应测试盒是利用竞争性酶联反应原理,广泛应用于水产、养殖及动物肉制品（如鸡肉、牛肉和猪肉组织）、尿样、血清、鸡蛋和蜂蜜中呋喃唑酮（AOZ）残留的定量检测。经试验证明,该试剂盒具有快速提取被测样品中违禁药物呋喃唑酮,提取时间仅需4h;高灵敏度能够检测到标准曲线中0．05ng／mL浓度的呋喃唑酮;低检测下限,能够检测到被检测饲料样品中0．1μg／kg含量的呋喃唑酮,而这个含量要低于欧盟标准要求的1μg／kg;检测过程时间短,只需要2h左右;高重复性,离散系数（CV值）≤3．5;标准曲线r≥0．9965;能够达到80％～95％以上的回收率等特点。     

高效液相色谱法测定博落回注射液中血根碱和白屈菜红碱的含量

利用高效液相色谱法测定博落回注射液中血根碱和白屈菜红碱的含量。采用Agilent1100型高效液相色谱仪,色谱柱为AgilentEcpliseXDB—C18（5μm,4．6mm×250mm）,流动相为三乙胺溶液-乙腈（75：25,V／V）,流速1．0mL／min;检测波长270nm;柱温35℃。结果表明：血根碱在0．5～100μg／mL范围内线性关系良好（R2=0．9999）,平均加样回收率（n=3）为96．1％～97．9％,RSD为0．8％～1．8％;白屈菜红碱在0．5～100μg／mL范围内线性关系良好（R2=1）,平均加样回收率（n=3）为96．8％-98．8％,RSD为0．6％～1．0％。本法简单快捷,精密度好,可为制定质控标准提供参考。     

饲料中糖皮质激素类药物含量的UPLC—MSJ／MS检测方法的研究

试验建立了饲料中9种糖皮质激素类药物含量的UPLC—MS／MS检测方法。饲料中的糖皮质激素类药物经甲醇振荡提取，浓缩蒸干，溶解后用碳黑固相萃取柱串接氨基固相萃取柱净化后，液相色谱一串联质谱法测定，外标法定量。9种药物在2～100．g／ml浓度范围内呈线性相关，相关系数在0．997～0．9995，方法在饲料中最低检测限（LOD）为2μg／kg；定量限（LOQ）为5μg/kg。此方法在空白饲料中添加5～20ng／g浓度范围内，平均回收率在55．1％～88．2％，批内变异系数为3．3％～19．1％，批间变异系数为4．2％～13．5％。该方法具有较好的灵敏度、准确度和精密度，能完全满足饲料中此类药物含量的检测，可以作为此类药物的标准化检测方法。     

液相色谱-质谱联用检测饲料中的苏丹红

采用液相色谱-质谱联用（LC-MS）方法检测饲料样品中的苏丹红含量。液相色谱分析柱为Waters Sunfire^TM C18 150mm×2．1mm，3．5μm；流动相为乙腈和0．2％甲酸与乙腈的混合溶液；质谱选择电喷雾离子源（ESI^＋）。在0．5～500μg／L浓度范围内，苏丹红Ⅰ、Ⅱ、Ⅲ和Ⅳ均呈线性，在1．0、5．0、和10．0μg／L3种添加浓度，苏丹红Ⅰ、Ⅱ、Ⅲ和Ⅳ相应的平均回收率为60％～80％。试验检测上海地区生产和销售的部分鸡鸭配合饲料，基本探明了上海地区鸡鸭饲料中苏丹红的使用状况。     

林可霉素在饲料中残留的微生物学检测方法

建立了林可霉素在配合饲料中残留的微生物学检测方法。样品用二氯甲烷提取经浓缩、溶剂转换．制成试样溶液，再用藤黄微球菌作为检定茼进行含量测定。结果显示。林可霉素在0．15-2．4μg／ml的浓度范围内具有良好线性关系（r=0．9991）。配合饲料中3种添加浓度1．00μg／g、400μg／g、8．00μg／g的平均回收率为80．2％（n=9）。RSD分别为5．7％、4．2％、2．2％（n=3）。     

高效液相色谱法测定饲料中的黄曲霉素B1

试验建立了免疫亲和色谱-高效液相色谱法（HPLC）测定饲料中黄曲霉素B1，采用甲醇-水提取饲料中的黄曲霉素B1，用免疫亲和色谱柱净化，以甲醇和水为流动相，反相高效液相色谱荧光检测法进行测定，激发波长为365nm，发射波长为435nm。方法的检测限为0．01μg／kg，定量限为0．03μg／kg，平均回收率为77．5％，变异系数为0．03％。     

奶牛血液中蓖麻碱含量的HPLC检测

建立了血液中蓖麻碱残留量的高效液相色谱（HPLC）检测法。用三氯甲烷提取蓖麻碱，除去蛋白质和脂肪后，用HPLC法对其进行测定。采用Hypersil ODSC C18色谱柱（250mm×4．6mm，25μm），水-乙腈（9：1，V/V）为流动相，流速0．8mL／min，检测波长为220nm。结果显示，在0．26—5．2μg范围内，蓖麻碱峰面积与质量的线性关系良好，回归方程为y=1．57×10^4 x-4．93×10^5，r=0．999，RSD=3．82％。牛血中蓖麻碱平均回收率为72．1％，RSD为2．54％（n=5）。饲喂蓖麻粕的牛血液中蓖麻碱的含量为0．512μg／mL。     

火焰原子吸收光谱法测定泛酸钙中的钙含量

用火焰原子吸收光谱法测定泛酸钙中的钙含量。以氯化钾溶液（0．1％，m／V）配制泛酸钙检测液，可消除空气-乙炔火焰的电离干扰作用。方法的线性范围为0．50～4．00μg／mL（r=0．9992），加标平均回收率为98．7％，RSD为0．46％（n=9）。     

液相色谱-质谱法分析禽蛋中的苏丹红

建立了禽蛋中苏丹红的液相色谱-质谱联用（LC—MS）检测方法。液相色谱柱为Waters SunfireTM C18150mm×2．1mm，3．5μm，柱温30℃，流动相A为乙腈，B为0．2％甲酸和乙腈的混合溶液，梯度洗脱，流速0．25mL／min；质谱选择电喷雾离子源（ESI^＋）。此条件下苏丹红Ⅰ和苏丹红Ⅱ的线性范围是0．1—500μg／L，检测限0．1μg／kg；苏丹红Ⅲ和苏丹红Ⅳ的线性范围是0．5—500μg／L，检测限0．5μg／kg。四种苏丹红的回收率为60％-80％。     

免疫亲和柱荧光光度法和高效液样色谱法测定饲料中黄曲霉毒素

利用免疫亲和柱荧光光度法和高效液相色谱法测定饲料中黄曲霉毒素。免疫亲和柱一荧光光度法测定饲料中的黄曲霉毒素的测定范围10-50μg／kg；线性相关系数0．99；检测灵敏度1μg／kg；变异系数〈18％；回收率82％～120％；分析时间20min，不需要剧毒的黄曲霉毒素标准品。免疫亲和柱一高效液相色谱法测定可以分别定量地检测饲料中黄曲霉毒素B1，B2,G1，G2，在黄曲霉毒素B1为0～50μg／kg测定范围内其线性相关系数0．91；检测灵敏度1μg／kg；变异系数〈10％；回收率81％-110％。     

白术、微米白术和白术多糖对断奶仔猪生长性能和肠道形态及微生态区系的影响

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。     

Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia

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.     

Feline intracranial neoplasia: retrospective review of 160 cases (1985-2001)

The purpose of this study was to determine the frequency of different tumor types within a large cohort of cats with intracranial neoplasia and to attempt to correlate signalment, tumor size and location, and survival time for each tumor. Medical records of 160 cats with confirmed intracranial neoplasia evaluated between 1985 and 2001 were reviewed. Parameters evaluated included age, sex, breed, FeLV/FIV status, clinical signs, duration of signs, number of tumors, tumor location(s), imaging results, treatment, survival times, and histopathologic diagnosis. Most of the cats were older (11.3 +/- 3.8 years). Primary tumors accounted for 70.6% of cases. Metastasis and direct extension of secondary tumors accounted for only 5.6 and 3.8% of cases, respectively. Twelve cats (7.5%) had 2 or more discrete tumors of the same type, whereas 16 cats (10.0%) had 2 different types of intracranial tumors. The most common tumor types were meningioma (n = 93, 58.1%), lymphoma (n = 23, 14.4%), pituitary tumors (n = 14, 8.8%), and gliomas (n = 12, 7.5%). The most common neurological signs were altered consciousness (n = 42, 26.2%), circling (n = 36, 22.5%), and seizures (n = 36, 22.5%). Cats without specific neurological signs were common (n = 34, 21.2%). The tumor was considered an incidental finding in 30 (18.8%) cats. In addition to expected relationships (eg, meninges and meningioma, pituitary and pituitary tumors), we found that lesion location was predictive of tumor type with diffuse cerebral or brainstem involvement predictive of lymphoma and third ventricle involvement predictive of meningioma.     

Y‐chromosomal variation of local goat breeds of Turkey close to the domestication centre

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.     

A brief history of the prevention of infectious diseases by immunisations

Infectious diseases have always been a terrible scourge for humans. The appearance of these plagues, as they were called without distinction, was generally connected to various conditions: asters, climatic changes or religious reasons. The concept of contagious, and then infectious, diseases came slowly. Variolation, i.e. transmission of ‘virulent’ matter to induce a natural disease and the immunity against it, was brought from Constantinople to England by Lady Montague, in 1721. This ‘variolation’ technique was also often performed in veterinary medicine against diseases like sheep-pox or pleuropneumonia. As ‘vaccination’ is the term generally accepted for ‘immunisation’, variolation can be the word designating such a technique. The second period of the history of immunisation began, in 1880, with the studies of Pasteur and his collaborators. A great number of bacterial vaccines were developed: dead, live but attenuated or only parts of pathogens. The viruses were produced in animals, then in eggs and at last, in tissue cultures. Second generation vaccines appeared with genetic engineering: recombinant vaccines, vector vaccines, nucleic acids vaccines, and markers vaccines, among others. These novel technologies can permit the development of new ones and improve the quality of the vaccines already existing.     

Micronutrient Content of Certain Tropical Conventional and Unconventional Feed Resources of Southern India

The ash, silica and certain important micronutrients were estimated in conventional and unconventional feed and fodder resources available in Southern India. Commonly used dry roughages, such as paddy straw, ragi straw, maize kadbi/stalk, jowar kadbi/stalk, bajra stalk and wheat straw, were high in ash (9.9% +/- 0.77%) and silica (6.4% +/- 0.65%) and low in most of the other micronutrients, except iron, with paddy straw containing most silica (>9%). Cultivated non-leguminous (maize, jowar) and improved green crops (hybrid napier, guinea, green panic, NB-21, CO-1) were also high in ash (10.5% +/- 0.60% and 12.5% +/- 0.51%) but were moderate sources of P, Mg and Cu and good sources of Zn (98 +/- 13.8 ppm and 55 +/- 6.7 ppm). Leguminous green fodders (stylosanthus, lucerne, cow pea, soyabean) were excellent sources of Ca (1.9% +/- 0.16%), Mg (0.40% +/- 0.05%), Cu (30 +/- 5.2 ppm), Zn (121 +/- 14.7 ppm) and Fe (1234 +/- 166 ppm) and moderate sources of P. Mixed local grasses and weeds were high in silica (6.9% +/- 1.00%) but were good sources of Cu, Zn and Fe. Cereal grains (maize, wheat, rice, ragi) were low in ash (2.9% +/- 0.33%) and were relatively poor sources of Ca (0.22% +/- 0.03%), Mg (0.19% +/- 0.03%) and Cu (13 +/- 3.1 ppm). Pulses were low to medium sources of most minerals and good sources of Fe (1230 +/- 293 ppm). Oil seed cake/extractions (groundnut cake, cotton seed cake, soyabean meal, sunflower cake, safflower cake) and cereal by-products (rice polish, rice bran, wheat bran) were excellent sources of P (1.1% +/- 0.47% and 2.3% +/- 0.19%) and good sources of Zn (65 +/- 3.9 ppm and 66 +/- 10.7 ppm) and Fe (938 +/- 130 ppm and 662 +/- 126 ppm). Among the unconventional feeds screened, orange peel, sunflower heads, meat meal, rubber seed cake, spirulina algae and sea weeds contained plentiful Ca, Zn and Fe: tree leaves/top feeds (mulberry, erythrina, glyricidia, banana, subabul, groundnut haulms) were excellent sources of Ca (1.5% +/- 0.13%), Zn (120 +/- 22.9 ppm) and Fe (1033 +/- 133 ppm) but relatively poor sources of P. Soyabean husk, cocoa seed husk, rubber seed cake and meat meal were moderate to good sources of P (1.0% and 0.33%). The high Zn and Fe values of most feeds/fodders were probably due to soil contamination. This account of the micronutrient content of feed/fodder resources should help in strategic supplementation intended to alleviate local deficiencies.     

Bovine Mastitis in Selected Areas of Southern Ethiopia

A study on bovine mastitis, designed to determine the causal agents, prevalence of infection and impact of risk factors in three cattle breeds, was conducted in selected areas of southern Ethiopia. A total of 307 lactating and non-lactating cows, of which 162 were indigenous Zebu, 85 Jersey and 60 Holstein-Friesian, were examined by clinical examination and the California mastitis (CMT) test. Of these, 40.4% were positive by CMT and bacteriology for clinical or subclinical mastitis, with prevalence rates of 37.1% and 62.9%, respectively. Out of 1133 quarters examined, 212 (18.7%) were found to be infected, 83 (39.2%) clinically and 129 (60.8%) subclinically. The prevalence of mastitis was significantly higher in Holstein-Friesian than in indigenous Zebu, in non-lactating cows than in lactating cows, in the early lactation stage than in the mid-lactation stage, in cows with lesions and/or tick infestation on skin of udder and/or teats than in cows without this factor, and in the wet season than in the dry season. Mastitis increased with parity number (R = 0.9). Of 248 CMT and clinically positive udder quarter samples analysed microbiologically, 212 were culturally positive for known mastitis pathogens and 36 were negative. Of the 199 positive samples, Staphylococcus accounted for 39.2%, Streptococcus for 23.6%, coliforms for 14.1%, Micrococcus and Bacillus species for 8.0% each and Actinomyces or Arcanobacterium (Corynebacterium) for 7.0%. It was concluded that there was a high prevalence of clinical and subclinical mastitis, mainly caused by Staphylococcus aureus, Streptococcus agalactiae and Escherichia coli, in this study area.     

不同日粮氮水平对山羊氮代谢和微生物蛋白质合成的影响

本试验旨在探讨不同日粮氮水平对内蒙古白绒山羊氮代谢和微生物蛋白质合成(MCP)的影响,以达到提高氮利用率,减少环境污染和饲料资源的浪费。试验选用9只体况良好、体重为(43.83±2.95)kg,装有瘤胃瘘管的内蒙古白绒山羊,按体重随机分为3组,每组3只。日粮分为低氮7.5%、中氮10.5%、高氮13.5%3个氮水平。试验使用常规试验方法分析测定粪尿血液等生化指标,通过全收尿法和尿嘌呤衍生物法估测MCP。结果表明:随着氮水平增加,氨氮(NH3-N)浓度、氮摄入量、尿氮排出、尿中尿素氮(UUN)和MCP显著增加(P0.05),干物质采食量(DMI)显著降低(P0.01);沉积氮占总摄入氮的比例在中氮组最高,MCP在高氮组最高。综上所述,适当降低日粮氮水平可减少粪尿氮排放,提高反刍动物氮利用率。     

Microsporidial keratopathy in two dogs

A microsporidial keratopathy is described in two dogs. Both dogs presented with a unilateral stromal keratopathy characterized by multifocal coalescing opacities, and the diagnosis was made on histopathologic examination of keratectomy specimens. Transmission electron microscopy (TEM) on formalin‐fixed, paraffin‐embedded corneal tissue was performed in one dog, and the morphologic features were consistent with Nosema species infection. Both dogs were initially diagnosed and treated by superficial keratectomy. One dog received additional antifungal medication and underwent a penetrating keratoplasty following local recurrence two years later. No other systemic lesions attributable to the microsporidial infection were identified clinically. The clinical and diagnostic pathology findings, treatment, and follow‐up are discussed.