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1.
牛羊猪肉组织中伊维菌素残留量检测HPLC法的改进 总被引：1，自引：0，他引：1
对牛、羊、猪肉组织中伊维菌素残留的检测方法进行了改进，样品用乙腈提取，用正己烷脱脂并于50℃减压蒸干。残留物用乙酸乙酯溶解，过C18SPE柱，用乙酸乙酯-甲醇（1：1）溶液洗脱；收集流出液和洗脱液，合并蒸干后于（50±3）℃减压干燥20min；残留物用N-甲基咪唑溶解并与三氟乙酸酐-乙腈（1：2）溶液于（67±2）℃衍生1h。用配荧光检测器的高效液相色谱仪检测。本方法平均回收率为（102．0±6．6）％，批内RSD〈10％，伊维菌素浓度在5～400ng／mL时，呈线性关系，r=0．9997。检测限为2μg／kg。 相似文献
2.
猪肾脏中氯丙嗪和异丙嗪残留检测方法的建立 总被引：6，自引：0，他引：6
建立了猪肾脏中氯丙嗪和异丙嗪残留量检测的高效液相色谱法。猪肾脏中残留的氯丙嗪和异丙嗪,用乙腈提取,再依次用酸化乙腈和正己烷净化,氮气吹干,甲醇溶解后,用Waters高效液相色谱系统,HypersilC18柱,UV检测器,用V(乙腈)∶V(水)∶V(0.5mol·L-1乙酸铵)(50∶49∶1)为流动相,流速1.2mL/min,波长254nm测定,内标法定量。结果表明,氯丙嗪和异丙嗪在猪肾脏中的最低检测限均为10μg/kg,组织中添加量为10μg/kg时,氯丙嗪和异丙嗪的回收率分别为83%和84%,批间变异系数均小于20%。该方法样品处理简单,可同时检测氯丙嗪和异丙嗪在猪肾脏中的残留量。 相似文献
3.
研究了用高效液相色谱法(HPLC)检测鸡、兔组织中氯苯胍残留量的方法.用乙酸乙酯提取后离心,上清液减压旋转蒸干,用正己烷溶解残渣后过弗罗里硅土固相萃取柱净化,10%丙酮甲醇溶液洗脱,洗脱液蒸干后用甲醇溶解残渣并定容.HPLC条件:紫外检测器,检测波长353 nm,外标法定量.线性范围在5～500 ng/mL,回归方程为C=139.75A-190.10,r=0.999 9;回收率为70%～110%,批内变异系数小于15%,批间变异系数小于20%;本方法的最低定量限为10 ng/g. 相似文献
4.
高效液相色谱法测定饲料中甲砜霉素含量 总被引：1，自引：0，他引：1
建立了测定饲料中甲砜霉素的含量的高效液相色谱检测方法。2g饲料样品,乙酸乙酯提取后蒸干,加入4%氯化钠,正己烷脱脂后乙酸乙酯反提,蒸干,流动相溶解后上机。色谱柱为C18,流动相为甲醇-水(25:75,V/V),检测波长225nm,流速1.2mL/min,柱温室温。在0.1～500μg/mL的质量浓度内甲砜霉素的峰面积与质量浓度呈良好的线性关系(r=0.9997),平均回收率超过76%,RSD小于12%。 相似文献
5.
为了研究氯氰碘柳胺钠驱除羊肝片吸虫的疗效,分别采用硝氯酚(对照组)与氯氰碘柳胺钠(试验组)驱除羊肝片吸虫,对比试验两组治疗前后的羊感染肝片吸虫总虫卵数变化情况。结果表明,就虫卵减少率来讲,试验组患者的98.67%明显高于对照组的81.76%(P0.05);就不良反应发生率来讲,试验组(8.00%)明显低于对照组(40.00%)(P0.05)。采用氯氰碘柳胺钠驱除羊肝片吸虫的效果较为显著,且不良反应较小,值得推广使用。 相似文献
6.
7.
为建立高效液相色谱法测定牛奶中氯唑西林残留的方法,牛奶样品用乙腈沉淀蛋白,三氯甲烷反萃取,有机相旋干用流动相溶解,正己烷除脂。0.02mol/L磷酸二氢钾溶液(pH 5.0)-乙腈(68∶32)比例为流动相,C18反相色谱柱分离,紫外检测。结果氯唑西林在15μg/kg～1 000μg/kg范围内呈现良好的线性关系,相关系数大于0.999 0;在15、30、60μg/kg三个添加水平,氯唑西林在牛奶中的平均回收率为70.25%～94.38%,批内变异系数小于8.34%,批间变异系数小于3.52%。方法检出限为5μg/kg,定量限为15μg/kg。表明该检测方法简单、灵敏、可靠,适用于牛奶中氯唑西林残留的分析检测。 相似文献
8.
《中国畜牧兽医》2019,(11)
试验旨在通过高效液相色谱(high performance liquid chromatography,HPLC)法测定五氯柳胺阿苯达唑复方混悬液的有关物质。采用高效液相色谱法,以自身对照法计算五氯柳胺阿苯达唑复方混悬液有关物质的量。选用Thermo Hypersil BDS C18色谱柱(4.6 mm×150 mm,5μm);流动相以0.1%磷酸-10 mmol/L磷酸二氢铵水溶液为A相,以甲醇为B相,31∶69(V/V);流速为1 mL/min;进样量为5μL;柱温30℃;检测波长295 nm。结果显示,在建立的色谱条件下,五氯柳胺阿苯达唑复方混悬液中的主成分峰与杂质峰均能基线分离。3,5,6-三氯水杨酸、2-氨基-4,6-二氯苯酚盐酸盐、五氯柳胺、阿苯达唑在5～100μg/mL内与峰面积线性关系良好(R~2≥0.999),定量限分别为5μg/mL及750、500、225 ng/mL,检测限分别为1μg/mL及500、250、100 ng/mL,杂质3,5,6-三氯水杨酸、2-氨基-4,6-二氯苯酚盐酸盐总平均回收率分别为101.15%、100.35%,总平均回收率RSD均为0.71%(n=9)。经方法学验证,建立的HPLC方法简单、快速、准确,可用于五氯柳胺阿苯达唑复方混悬液中有关物质的测定。 相似文献
9.
以自然感染消化道线虫的绵羊为对象，用复方伊维菌素注射液进行治疗，并用伊维菌素注射液、氯氰碘柳胺钠注射液和空白不用药进行对照，试验结果表明：复方伊维菌素注射液以0．05mL/kg体重剂量一次性肌肉注射，能够有效驱除绵羊消化道线虫。投药后第10天，虫卵减少率和虫卵转阴率分别为96．72％、90％；投药后第21天，均为100％，疗效明显优于单独使用伊维菌素注射液和氯氰碘柳胺钠注射液，且驱虫安全，无任何毒副作用。 相似文献
10.
《中国饲料》2014,(13)
本实验建立了高效液相色谱法测定饲料中盐酸赛庚啶和盐酸可乐定含量的方法。取2 g样品以0.1%盐酸-乙腈沉淀蛋白,8000 r/min高速离心3 min后合并上清液,50℃减压旋转蒸发至干。5 mL 0.1%盐酸-乙腈(90∶10,V/V)溶液溶解后通过混合型阳离子交换柱净化,收集洗脱液于50℃减压旋转蒸发至干,用1 mL 0.1%盐酸-乙腈(90∶10,V/V)溶液溶解后,过0.22μm尼龙过滤膜,上机测定。液相色谱条件为:流动相A为0.1%HCl(pH=2.0),流动相B为乙腈,进行梯度洗脱,色谱柱为十八烷基硅烷键合相,柱温30℃,流速1.0 mL/min,检测器为二极管阵列检测器,检测波长为210 nm。实验结果表明,该方法在1~100 mg/kg线性关系良好(r0.999),在预混合饲料、浓缩饲料、配合饲料中添加量为1、10、100 mg/kg时方法的准确性(回收率70%)和重现性(RSD10%)好,可用于饲料中盐酸赛庚啶和盐酸可乐定含量的检测。 相似文献
11.
Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
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
12.
Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
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
13.
Waruiru RM Thamsborg SM Nansen P Kyvsgaard NC Bogh HO Munyua WK Gathuma JM 《Tropical animal health and production》2001,33(3):173-187
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round. 相似文献
14.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host. 相似文献
15.
16.
Evaluation of biohydrogenation rate of canola vs. soya bean seeds as unsaturated fatty acids sources for ruminants in situ 
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下载免费PDF全文 S. Pashaei T. Ghoorchi A. Yamchi 《Journal of animal physiology and animal nutrition》2016,100(2):211-216
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed. 相似文献
17.
Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb
albumin
- ALT
alanine aminotransferase
- AST
aspartate aminotransferase
- BUN
blood urea nitrogen
- Chol
cholesterol
- Glob
globulin
- -GT
-glutamyl transpeptidase
- IP
inorganic phosphorus
- TP
total protein 相似文献
18.
A knowledge of the microbiological status of milk and of the different structures in the mammary glands has great importance
in elucidating the pathogenesis of mammary gland infections. The objective of this study was to evaluate the microbiological
status of various structures in the mammary glands from naturally infected dairy cows following slaughter. A total of 94 samples
of milk, 184 samples of mammary parenchyma, 168 samples of gland cisterns, and 168 samples of teat cisterns were collected
for microbiological examination. Microorganisms were detected in 59.9% of all samples, 67.0% of the milk samples, 70.1% of
the mammary parenchymas, 55.9% of the gland cisterns and 48.8% of the teat cistern samples. When all samples were considered,
coagulase-negative Staphylococcus were the most prevalent (35.7%) followed by coagulase-positive Staphylococcus (12.2%), Corynebacterium bovis (2.4%), Prototheca sp. (1.9%), and Streptococcus dysgalactiae (1.5%). There was a significantly higher occurrence of microorganisms in the milk and mammary parenchyma compared to the
gland cisterns and teat cisterns.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
Four grass plots were sequentially contaminated with goat faeces containing known numbers of unembryonated eggs of predominantly Haemonchus contortus and Trichostrongylus spp. between October 1982 and April 1983. Four other plots were similarly contaminated with sheep faeces between February and May 1987. An additional plot was repeatedly contaminated with sheep faeces from February to April 1987. Populations of free-living stages in faeces and of infective larvae (L3) in the herbage were subsequently monitored until the end of April and June of 1983 and 1987 respectively. During February and May 1987 two control cultures of sheep faeces were incubated in the laboratory at 25°C–30°C and at a constant temperature of 50°C and the free-living development was also monitored. L3 developed very readily in the faeces cultured at 25°C–30°C and in those spread on a grass plot in October, at the end of the wet season, but developed less on the plot contaminated in May at the start of the wet season. Worm eggs in faeces deposited on plots during the hot dry season (December to April) or incubated at 50°C died and disintegrated after 24–48 h exposure to the high environmental temperatures. The results indicate that it is unlikely that gastrointestinal nematodes of sheep and goats can develop or survive on open pasture during the dry season in the Nigerian derived savanna zone. 相似文献
20.
Acute phase proteins in dogs naturally infected with the Giant Kidney Worm (Dioctophyme renale) 下载免费PDF全文
下载免费PDF全文 Elizabeth M. S. Schmidt Mads Kjelgaard‐Hansen Funmilola Thomas Asta Tvarijonaviciute José J. Cerón P. David Eckersall 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(4):657-664