番鸭源鸭疫里默氏菌大环内脂类药物的耐药基因检测与分析

为了解莆田市番鸭源鸭疫里默氏菌对大环内酯类药物的耐药性和相关耐药基因携带情况,对本实验室分离鉴定的49株番鸭源鸭疫里默氏菌菌株采用K-B纸片扩散法进行药敏试验,提取菌株基因组DNA,采用PCR方法对大环内酯类药物的ermA、ermB、ermC、ermF、ereD等5种耐药基因进行检测,阳性产物送公司测序并对序列进行分析...     

绵羊FSTL3基因g.40674542C>T位点多态性与产羔数的关联分析

文章旨在探究绵羊FSTL3基因g.40674542C>T位点多态性与绵羊产羔数之间的关系,以期为绵羊高繁殖力分子育种提供新的遗传标记。利用全基因组重测序结合Sequenom MassARRAY~SNP技术对常年发情绵羊品种(小尾寒羊、策勒黑羊和湖羊)和季节性发情绵羊品种(滩羊、苏尼特羊和草原型藏羊)FSTL3基因g.40674542C>T位点多态性进行了检测,并与小尾寒羊产羔数进行了关联分析。结果表明:FSTL3基因g.40674542C>T位点存在CC、TC和TT三种基因型,基因型频率和等位基因频率在两种发情模式绵羊品种间差异均不显著(P>0.05);g.40674542C>T位点在6个绵羊品种中均表现为低度多态(PIC<0.25),经卡方适合性检验,该位点在小尾寒羊、湖羊和草原型藏羊中处于哈代温伯格平衡状态(P>0.05),在其余3个绵羊品种中处于哈代温伯格不平衡状态;g.40674542C>T位点不同基因型与小尾寒羊第一、第二以及第三胎产羔数均无显著关联(P>0.05)。说明FSTL3基因g.40674542C>T位点不适合用于小尾寒羊产羔数选育。     

ELISE测定猪尿、猪肝中克伦特罗残留的研究

ELISA(酶联免疫吸附法)测定猪尿、猪肝中违禁药物克伦特罗残留量影响实验结果表明,德国拜发与北京望尔生产的两种ELISA试剂盒具有操作简单、时间短、成本低、敏感度高等特点。在室温20-22℃条件下,试验制备过程中必须做到控温度、控转速、控流速及洗板过程中应注意事项,这样可大大提高在实际操作过程中检测的准确性。     

山东小尾寒羊研究概况

介绍了山东小尾寒羊的研究概况 ,主要内容包括该品种的繁殖性能、屠宰性能、杂交利用等方面的最新研究成果 ,比较全面地阐述了山东小尾寒羊的种质特性。     

广西禽巴氏杆菌的分离及其特性的测定

1990～1997年间,本研究室从广西不同地区鸡场死于禽巴氏杆病菌的家禽中分离并鉴定13株禽巴氏杆菌（包括鸡源的12株,鸭源的1株）。菌株经中国兽药监察所进行Carter定型,结果为荚膜A型。13个分离菌株都100％致死本地三黄鸡。     

新城疫含硒油佐剂疫苗增强肉鸡免疫效果的研究

以新城疫ＬａＳｏｔａ系疫苗滴鼻，采用自制的含１５×１０－６亚硒酸钠新城疫油佐剂疫苗给４０只５日龄ＡＡ肉鸡颈部皮下接种，于１５、２５、３５、４５日龄时分别抽取１０只进行称重和测定血硒含量、Ｈｌ抗体水平。结果表明，新城疫含硒油佐剂疫苗接种肉鸡的增重、血硒含量及ＨＩ抗体水平均高于非含硒新城疫油佐剂疫苗接种鸡（Ｐ＜０．０１或Ｐ＜０．０５）。     

Salmonella enteritidis clearance and immune responses in chickens following Salmonella vaccination and challenge

Our previous work showed that the cell-mediated immunity (CMI) was enhanced by live Salmonella vaccine (LV). The objective of this study was to evaluate the impact of live and killed Salmonella vaccines on Salmonella enteritidis (SE) clearance and to determine if the clearance was mediated by cell-mediated and/or humoral immunity. Chickens were first immunized at 2 weeks of age followed by a booster dose at 4 weeks, challenged with live SE 2 weeks later (6-week-old) and tested for CMI, antibody response and SE clearance 1-week post SE-challenge (7-week-old). Spleen cell proliferation induced by SE-flagella and Concanavalin A (Con A) were significantly higher and SE shedding was significantly lower in the LV group. The splenic CD3 population was significantly lower and B cells were higher in the control group compared to all the SE-challenged groups (with and without vaccination). Serum antibody to SE-flagella and envelope were significantly higher in the KV group compared to all the other groups. These results suggest that LV protects against SE infection, probably by enhancing the CMI.     

一例剖腹产母犬及仔犬的护理

一头4岁龄史宾格母犬于2005年3月12日发情,3月21日和3月23日交配两次。该母犬5月21日上午出现产前征兆,扒窝,烦躁,于17点45分开始产第1头仔犬,至当晚20点50分产下第4头仔犬后,由于第5头仔犬胎位不正,至5月22日上午9点30分由兽医人工助产,仔犬死亡。10点10分产下第6头仔犬后,第7头仔犬又出现胎位不正。此时母犬体力出现下降,呼吸急促,兽医决定实施剖腹产,手术于17点20分至19点10分进行,剖腹后拿出4头仔犬,其中2头死亡,2头存活。     

外源肌苷酸对种鸡产蛋性能、蛋品质及种蛋孵化性能的影响

本试验通过在种鸡的基础饲粮中加入肌苷酸(IMP)来研究其对种鸡产蛋性能、蛋品质和种蛋孵化性能的影响。选择遗传背景相同、体重相近,产蛋率达到5%的20周龄健康AA种鸡864羽,随机分为2组(对照组饲喂基础饲粮;试验组饲喂基础饲粮+0.5%肌苷酸),每组6个重复,每个重复72羽,试验期30 d。测定试验期间所有种蛋的平均蛋重、产蛋率和合格蛋率;每组随机选取部分种蛋进行蛋品质测定;于孵化开始第17天,通过照蛋处理统计种蛋受精率,第21天出雏时,计算受精蛋孵化率、入孵蛋孵化率和健雏率。试验结果表明:与对照组相比,试验组种鸡的平均蛋重、产蛋率和合格蛋率均有升高的趋势,但差异不显著(P>0.05);蛋形指数显著升高(P<0.05),蛋壳强度、蛋壳厚度和蛋黄颜色显著降低(P<0.05);受精率、受精蛋孵化率和入孵蛋孵化率显著升高(P<0.05),健雏率和雏鸡体重有升高的趋势,但差异不显著(P>0.05)。综上,0.5%外源肌苷酸对种鸡的产蛋性能和种蛋孵化性能均有促进作用。     

Expression and functional analysis of the Follistatin-like 3 (FSTL3) gene in the sheep ovary during the oestrous cycle

Follistatin-like 3 (FSTL3) is a regulator of cellular apoptosis and was previously identified via RNA-Seq to be associated with follicular development in mammalian ovaries. However, the mechanism underlying the FSTL3 regulation of oestrus in sheep remained poorly understood. In this study, the oestrogen (E2) and progesterone (P4) concentrations in blood were detected, and the expression level and functional analysis of FSTL3 in the ovary were studied during the different reproductive stage in Aohan fine wool sheep (seasonal breeding breed in China). The concentrations of E2 and P4 at the anestrus were significantly lower compared to dioestrus, proestrus and oestrus stages. Higher expression levels of FSTL3 were observed in the sheep ovary, hypothalamus, and thyroid. During different reproductive stages, higher expression levels were found during the stages of dioestrus and proestrus, while lower levels were found during the oestrus and anestrus stages. Functional analysis of FSTL3 was performed in primary granulosa cells (GCs) of sheep. The concentration of E2 increased significantly after RNAi interference of FSTL3, while the P4 level decreased. FSTL3 can decrease P4 levels, which might be involved in mediating oestrous cycle in sheep.