牦牛血清维生素A含量测定

采用荧光法对３７例青海牦牛血清维生素Ａ含量的测定结果为１．３５±０．２３μｍｏｌ／Ｌ。     

青海绒山羊血清维生素A含量测定

采用荧光法对 44例绒山羊血清维生素A含量进行了测定 ,结果为 0 82 μmol/L±0 14μmol/L。     

鸡血清 蛋黄 肝中维生素A和维生素E含量的荧光测定法探讨

用改良荧光法对鸡血清、蛋黄和肝中的维生素Ａ和维生素Ｅ进行了检测。通过测定维生素Ａ和维生素Ｅ的线性范围、灵敏度、精密度、回收率及不同浓度的维生素Ａ对维生素Ｅ测定结果的影响等,证明用这一方法同步检测动物血清、蛋黄中的维生素Ａ和维生素Ｅ,具有成本低廉、操作简便、结果可靠、易于推广等优点。同时证实了荧光测定中高浓度维生素Ａ对维生素Ｅ的严重干扰现象。     

藏羊血清中维生素A含量测定

采用荧光法对４３例青海藏羊血清中维生素Ａ的含量进行测定,结果为５．９３×１０－４ｍｍｏｌ／Ｌ±３．６３×１０－５ｍｍｏｌ／Ｌ（３．０４×１０－４～７．３３×１０－３）。并对该方法在测定动物血清中维生素Ａ含量的应用及诊断学意义做了评估。     

饲料中维生素A的测定

<正> 维生素A分析中的比色法,是根据维生素A与路易斯酸作用形成一种蓝色化合物,该物质在确定波长处有最大吸光度。路易斯酸中广泛采用三氯化锑作为显色剂。但使用三氯化锑—氯仿体系时有缺点,一是生成的蓝色化合物不稳定,很快褪色,比色测定必须在6秒内完成;二是三氯化锑具有强的腐蚀性及毒性,易吸附水,受温度、湿度影响大。本文介绍的三氯醋酸比色法不存在三氯化锑试剂的上述缺点,新生成的蓝色物质在30秒内稳定;比色溶夜在含有维生素D100μg并在有β—胡萝卜素存在条件下不干扰维生素A的测定,而且灵敏度高,不需贵重试剂及仪器,易于推广。     

酶解法测定饲料中维生素A含量

采用酶解法即用碱性蛋白酶处理复合预混料或维生素预混料，再利用高效液相色谱外标法测定其含量，结果表明，维生素A标示量在5000IU—260万IU范围呈良好的线性关系，线性方程为Y=-2742．28 516410．16X，相关系数为0．9999。     

用环己烷作溶剂测定维生素A含量

用环己烷作溶剂测定维生素Ａ含量南宁市粮油饲料总厂农高维生素Ａ是饲料添加剂原料及多用维生素主要检测的质量指标之一。目前我国测定维生素Ａ的标准是ＧＢ７２９２－８７《维生素Ａ乙酸酯微粒》和ＧＢ９４５５－８８《维生素Ａ／Ｄ３微粒》。这两种方法都需对维生素Ａ样...     

测定饲料中维生素A和维生素E含量方法的研究

本文旨在建立一种能同时准确测定饲料中维生素A和维生素E含量的方法,试验将样品在碱性条件下65℃水浴超声皂化提取,冰乙酸调pH至中性,乙醇稀释后直接用高效液相色谱法(HPLC)进行测定。结果表明:维生素A在0.036~108IU/mL线性关系良好,相关系数为1.00000,检出限1000IU/kg,方法回收率为95.8%~98.8%,RSD为0.8%~4.4%(n=5);维生素E在0.6~125μg/mL线性关系良好,相关系数为0.99998,检出限15mg/kg,方法回收率为95.3%~102.2%,RSD为0.8%~4.2%(n=5)。本方法快速简便,适用于配合料、浓缩料、维生素预混料和复合预混料中同时准确测定维生素A和维生素E的含量,相对于国标法节省了大量的时间和试剂,可应用于日常大批量饲料检测中。     

复合饲料添加剂对奶牛血清中维生素A,E水平的影响

复合饲料添加剂对奶牛血清中维生素Ａ、Ｅ水平的影响○第三军医大学大坪医院（重庆市６３００４２）蒋宝泉○重庆动植物检疫局宋定明吴德荣○重庆市农垦局邹莉萝刘耳维生素Ａ、Ｅ同其它维生素一样，是维持奶牛正常生命活动所必需的营养素。当日粮中青绿饲草不足或饲料质量...     

大通牦牛血清碱性磷酸酶及钙磷含量的测定

本试验对青海省大通种牛场的35头健康大通牦牛的血清碱性磷酸酶和血清钙、磷含量进行了测定,结果为：血清碱性磷酸酶的含量在45.15±3.41IU·L-1,血清钙含量在2.49±0.53 mmol·L-1,血清无机磷含量在1.98±0.21 mmol· L-1,均处于正常值范围内;公牦牛、母牦牛之间无显著性差异（P＞0.05）.     

Whole-Blood Validation of a New Point-of-care Equine Serum Amyloid A Assay

Serum amyloid A (SAA) is considered a major acute phase protein (APP) in horses. Serum amyloid A stall-side assays are commercially available to assess the inflammatory response of patients with various infectious and noninfectious conditions. The objective of this study was to determine the analytical performance of a new point-of-care (POC) assay for the measurement of SAA in whole blood and plasma of horses. One hundred and sixty blood samples were collected from 60 horses at various time points after immunization with an equine core vaccine. Analytical validation of the SAA POC assay included the measurement of SAA in whole blood and plasma, assessment of linearity and precision, and comparison of the SAA POC results with those obtained with a validated turbidimetric immunoassay (TIA). The SAA POC assay yielded similar results in whole blood and plasma (P > .05), and the results were positively correlated with the TIA (R² = 0.964). The assay displayed solid linearity throughout the detection range of ≤ 20 to 3,000 μg/mL (R² = 0.984) with inter-assay and intra-assay coefficients of variation ranging from 7.8% to 13.3% and 5.7% to 12.0%, respectively. The new SAA POC assay was able to reliably measure SAA in both whole blood and plasma. Similar to previously validated assays, the new SAA POC assay is a valuable tool to investigate the inflammatory response in various clinical diseases of horses.     

Short-term Evaluation of Serum Amyloid A after Exercise in Clinically Healthy Horses

Serum amyloid A (SAA), the major equine acute-phase protein, is often measured after the race to investigate whether poor performances could depend on inflammation. The aim of this study was to assess whether there is an increase in concentration of SAA in serum samples collected from 12 clinically healthy Standardbred horses 1 hour after a standard race. Exercise induced an increase in red blood cells, hematocrit, and total proteins but not in SAA. However, a two- to threefold increase of SAA concentration as compared with prerace values was found in three horses. In conclusion, the concentration of SAA in most of the samples collected 1 hour after the race remains unchanged as compared with prerace samples. However, individual variability in response to exercise exists. The evaluation of SAA immediately after the race is not clinically useful.     

Racing Induces Changes in the Blood Concentration of Serum Amyloid A in Thoroughbred Racehorses

Intensive exercise results in the increased blood concentration of the acute phase proteins in horses competing in some sport disciplines. In this study, the blood level of serum amyloid A (SAA) was analyzed in Thoroughbred racehorses during 5 days after completion of the race. Samples were collected from 25 healthy Thoroughbred horses beginning with 4 hours after the race and repeated daily up to the fifth day after the race. Serum amyloid A analysis was performed using commercial enzyme-linked immunosorbent assay kit, and the results were presented as median, interquartile range (IQR), and range. Data were analyzed using Friedman's nonparametric analysis of variance. The acute phase response (APR) was reflected by an increased SAA level after the race, reaching significantly higher concentrations on days 1 (P < .001) and 2 (P = .005) and falling below the level of the first sample on day 5 (P = .006). The median peak concentration observed on day 1 after the race was 3.84 mg/L (IQR, 2.32 to 8.86). Racing induces minute changes in SAA concentration typical for the exercise-induced APR; however, the significance of this reaction in the context of horse health and fitness remains unclear.     

血清3型鸭甲型肝炎病毒阳性血清的制备

通过使用血清3型鸭甲型肝炎疫苗免疫SPF鸡,制备了一批血清3型鸭甲型肝炎诊断用阳性血清,并对其进行了无菌、支原体和特异性检验以及中和效价测定。结果表明,该血清无菌检验合格,无支原体污染,特异性良好,无禽类常见13种外源病毒抗体,血清中和效价为10-2.8。本研究为鸭甲型肝炎病毒血清学鉴定及相关研究提供了重要的物质基础。     

Serum Amyloid A and Haptoglobin Concentrations and Liver Fat Percentage in Lactating Dairy Cows with Abomasal Displacement

Background: There has been increased interest in measuring the serum concentration of acute phase reactants such as serum amyloid A [SAA] and haptoglobin [haptoglobin] in periparturient cattle in order to provide a method for detecting the presence of inflammation or bacterial infection.
Objectives: To determine whether [SAA] and [haptoglobin] are increased in cows with displaced abomasum as compared with healthy dairy cows.
Animals: Fifty-four adult dairy cows in early lactation that had left displaced abomasum (LDA, n = 34), right displaced abomasum or abomasal volvulus (RDA/AV, n = 11), or were healthy on physical examination (control, n = 9).
Materials and Methods: Inflammatory diseases or bacterial infections such as mastitis, metritis, or pneumonia were not clinically apparent in any animal. Jugular venous blood was obtained from all cows and analyzed. Liver samples were obtained by biopsy in cattle with abomasal displacement.
Results: [SAA] and [haptoglobin] concentrations were increased in cows with LDA or RDA/AV as compared with healthy controls. Cows with displaced abomasum had mild to moderate hepatic lipidosis, based on liver fat percentages of 9.3 ± 5.3% (mean ± SD, LDA) and 10.8 ± 7.7% (RDA/AV). [SAA] and [haptoglobin] were most strongly associated with liver fat percentage, r _s=+0.55 ( P < .0001) and r _s=+0.42 ( P = .0041), respectively.
Conclusions and Clinical Importance: An increase in [SAA] or [haptoglobin] in postparturient dairy cows with LDA or RDA/AV is not specific for inflammation or bacterial infection. An increase in [SAA] or [haptoglobin] may indicate the presence of hepatic lipidosis in cattle with abomasal displacement.     

Investigation of the Usefulness of Serum Amyloid A in Supporting the Diagnosis of Equine Proliferative Enteropathy

The objective of this study was to determine if serum amyloid A (SAA), a major acute-phase protein, could help support the diagnosis of equine proliferative enteropathy (EPE) caused by Lawsonia intracellularis infection in foals. Archived serum samples from 101 foals with enteric signs and hypoproteinemia were available for SAA testing. Based on immunodiagnostics for L. intracellularis, the foals were divided into EPE-suspect (67) and non–EPE-suspect cases (34). Serum amyloid A values ranged from 0 to 2,761 μg/mL (median 466 μg/mL) and from 0 to 2,555 μg/mL (median 192 μg/mL) for the EPE-suspect and the non–EPE-suspect cases, respectively. Although SAA can be measured patient-side and help determine the severity of the underlying inflammatory condition, SAA was unable to consistently support the diagnosis of EPE in hypoproteinemic foals with enteric signs.     

海兰褐鸡血清淀粉酶同工酶

采用聚丙烯酰胺凝胶电泳法对５５只海兰褐鸡血清淀粉酶同工酶进行研究。结果：①血清淀粉酶有ＡＭＹ１，ＡＭＹ２和ＡＭＹ３三种同工酶；②ＡＭＹ２同工酶存在ＡＭＹ２ＡＡ，ＡＭＹ２ＡＢ和ＡＭＹ２Ｅ８三种表型，其表型频率分别为０．１８，０．３１和０．５１；③各同工酶区带的相对迁移率为：ＡＭＹ１１０．２１％，ＡＭＹ２ＡＡ８．１６％，ＡＭＹ２ＢＢ６．６３％，ＡＭＹ３２．０４％。     

Comparison of Serum Amyloid A in Horses With Infectious and Noninfectious Respiratory Diseases

The acute phase protein serum amyloid A (SAA) has been shown to be a useful inflammatory parameter in the horse, but studies showing SAA responses to specific respiratory disease etiologies are limited. The goal of this study was to evaluate SAA responses in horses with infectious and noninfectious respiratory diseases as well as healthy, control horses. Two hundred seven horses were grouped into the following categories: equine influenza virus (EIV), equine herpesvirus-4 (EHV-4), Streptococcus equi subspecies equi (S. equi ss equi), inflammatory airway disease (IAD), and healthy controls. Serum amyloid A concentrations were determined for all horses on serum using a stall-side lateral flow immunoassay test. Serum amyloid A levels were found to be significantly greater for infectious respiratory diseases (EIV, EHV-4, S. equi ss equi) and horses with IAD when compared to control horses. There was a significant difference between viral and bacterial infections and IAD. Although SAA values from horses with S. equi ss equi were significantly greater when compared to horses with viral infections (EIV/EHV-4), the wide range of SAA values precluded accurate classification of the infectious cases. In conclusion, SAA is more reliably elevated with infections of the respiratory tract rather than noninfectious airway conditions. This can facilitate early detection of respiratory infections, help track disease progression, and aid practitioners in making recommendations about proper biosecurity and isolation of potentially contagious horses.