免疫比浊法测定动物血清中免疫球蛋白的研究

免疫比浊法是把光浊度测定原理应用到抗原抗体反应上来用以确定抗原的量,其具有快速、准确、简便等优点。本文简要介绍免疫比浊法及其原理,初步探讨了其用于测定动物血清中免疫球蛋白的方法。     

饲料中添加不同水平的锌、硒、铜对奶牛奶量、乳品质及相关血清酶的影响

采用三因素,三水平,按L9(34)正交设计。进行了奶牛饲粮中添加不同水平(高、中、低)的Zn,Se,Cu饲喂试验。结果表明,补饲牛的健康良好,换毛提早,受孕率增高,日平均产奶量明显提高,乳品的乳蛋白。乳糖含量、乳脂率等乳品质量指标均有不同程度的增加。血清铜氧化酶和碱性磷酸酶活性,补饲牛比对照牛高,补饲后比补饲前高。     

Evaluation of an automated spectrophotometric assay for the determination of total sialic acid in canine serum

This study validates an automated enzymatic assay using the Cobas Fara (Roche) centrifugal analyser, which offers a reliable measurement of the total sialic acid concentration in canine serum as assessed by evaluating the precision and accuracy. Data are presented on the biological variation in the total serum sialic acid concentration. Measurements of total serum sialic acid concentration appear to be useful in distinguishing dogs with neoplastic disorders from clinically healthy dogs.Abbreviations AcNeu N-acetylneuraminic acid - CV% coefficient of variation - LASA lipid-associated sialic acid - S ² component of variance     

母猪妊娠早期血清和胎儿胎水中硫酸雌酮含量

应用放射免疫法测定枫泾（ＦＪ）和长白（Ｌ）青年母猪妊娠２８ｄ左右外周血清和胎儿羊水、尿囊液中硫酸雌酮（Ｅ１Ｓ）的含量；观察了两品种母猪胚胎存活数。结果，ＦＪ和Ｌ母猪血清、胎儿羊水及尿囊液中Ｅ１Ｓ含量（μｇ／Ｌ）分别为５．３±０．９９、８．０±１．０、３８．０±６．７和３．６±０．４６、５．６±０．９９、６１．４±１１．７，均处于较高水平，且两品种间无显著差异。尿囊液Ｅ１Ｓ含量极显著高于羊水和母体血清含量（Ｐ＜０．０１）；胚胎存活数（个），ＦＪ和Ｌ分别为１４．５±１．３和１０．４±１．３；血清Ｅ１Ｓ浓度与其胚胎存活数呈正相关：ｒＦＪ＝０．７４２６（Ｐ＜０．０１），ｒＬ＝０．４７４７（Ｐ＜０．０５）。上述结果表明，母猪妊娠早期孕体雌激素代谢功能很强，且以Ｅ１Ｓ形式存在于血清和胎水中。母猪血清Ｅ１Ｓ浓度不仅反映早期孕体分泌雌激素的功能，而且是预测早期胚胎存活数的有价值指标     

猪链球菌病氢氧化铝二价灭活苗免疫兔血清抗体消长规律

应用琼扩法 ( AGP)、间接 ELISA法检测猪链球菌病氢氧化铝二价灭活疫苗免疫兔的抗体水平。结果表明 ,免疫后 4d开始产生抗体 ,7d时免疫兔 1 0 0 %抗体阳转 ,1 5～30 d抗体效价达高峰。免疫后 35d血清抗体有所下降 ,二免后 5d抗体效价均显著升高 ,6个月后血清抗体在 1 :1 6 0 0。通过免疫抗体与攻毒保护相关性测试 ,抗体效价在 1 :80 0(含 1 :80 0 )以上能抵抗 1× 1 0 2 ～ 1× 1 0 3CFU马腺疫链球菌兽疫亚种强毒攻击。     

Serum glutathione peroxidase activity and blood selenium in pigs

Blood serum glutathione peroxidase activity and blood selenium concentration were measured in blood samples from pigs subjected to experimentally induced selenium deficiency and dietary selenium supplementation on graded levels. A highly significant correlation between blood selenium and serum GSH-Px activity in pigs, especially in selenium deficient pigs, was demonstrated. There was also a strong relationship between blood selenium concentration and serum GSH-Px activity in pigs receiving dietary selenium at graded levels. Serum GSH-Px activity exhibited an excellent close-response relationship to dietary selenium. Linear regression analysis showed that the increased serum GSH-Px activity was a function of the dietary selenium concentration. The fitness of serum in monitoring slight changes of the selenium status of pigs with help of the estimation of GSH-Px activity was discussed. The measurement of serum GSH-Px activity seems to provide a useful and rapid means for defining selenium requirements and for identifying selenium deficiency in growing pigs.     

Reference interval and critical difference for canine serum fructosamine concentration

The purposes of the study were to obtain a reference interval and to calculate the critical difference between two analytical results for canine serum fructosamine concentration. To obtain a reference interval, the serum fructosamine concentration was measured in blood samples from 29 adult dogs after a 15-h fasting period. To calculate the critical difference, blood samples from 20 apparently clinically healthy dogs were collected once weekly for five consecutive weeks, and the total variance of the analytical results was divided into the component of variance between dogs (S _inter ² ), the component of variance for weeks within dogs (S _intra ² ) and the component of variance for measurements (S _anal ² ), using nested analysis of variance. The critical difference was then calculated fromS _intra ² andS _anal ² .The main conclusions are in summary: The reference interval for canine serum fructosamine concentration is 258.6–343.8 µmol/L, and the critical difference between two consecutive measurements on a week-to-week basis is 32.4 µmol/L. The critical difference may be used as a guideline to indicate potentially important changes in the serum fructosamine concentration, though the analytical results should not be assessed by the critical differences alone, but should also be compared to the corresponding reference intervals.     

高温对肉用仔鸡生产性能和某些血清生化指标的影响

本文研究了高温对肉用仔鸡生产性能和５种血清生化指标的影响。结果表明：不同生长时期的高温对肉用仔鸡的生产性能和血清生化指标有不同程度的影响。如２２２４日龄肉用仔鸡在３４±１．５℃下，采食量减少，体重、血清总蛋白和白蛋白均显著下降（Ｐ＜０．０５），饲料转化率、血糖、球蛋白和胆固醇无显著变化。２２４２日龄给予高温处理，鸡采食量和饲料转化率均降低，体重、血糖、血清总蛋白、白蛋白和球蛋白均显著下降或极显著下降（Ｐ＜０．０５或Ｐ＜０．０１），胆固醇仍无明显变化。４０４２日龄给予高温处理，鸡的生产性能和各项血清生化指标均显著下降或极显著下降（Ｐ＜０．０５或Ｐ＜０．０１）。     

Resistance to Rhipicephalus evertsi evertsi in immunosuppressed rabbits

Rabbits treated with goat anti-rabbit thymocyte serum acquired less resistance to Rhipicephalus evertsi evertsi infestation than untreated controls. This inferior resistance was manifested as higher engorged weights of ticks and higher biotic potential, undue persistence of the ticks on the hosts and poor anti-tick antibody and delayed-type hypersensitivity responses. These observations highlight the significance of host T-cells in mediating resistance of ticks.     

Optimization of culture conditions for feline × murine heterohybridomas

Feline splenocytes were fused to the murine myeloma lines NSO or Ag8. Autologous serum and taurine were used as media supplements for the cat × mouse heterohybridomas. The best results were obtained by the use of NSO as fusion line with taurine-supported media.