仔猪死亡原因调查与对策

<正>哺乳仔猪和断奶仔猪发病死亡,直接影响到养猪业的正常发展。部分养猪专业户,已开始淘汰母猪。为了搞清仔猪发病死亡原因,笔者对我县部分自繁自养、自繁以及肥育猪场进行了走访和调查,共计调查123窝。通过调查,自繁自养的规模型猪场和散户存在着差异,结果如下:     

动物源性食品中药物残留问题初探

随着人们生活质量的提高，食品安全问题越来越为广大消费者所关注，特别是动物源性食品中药物残留问题更成为广大消费者关注的焦点问题。     

性别决定基因(下)

哺乳动物的性别决定在哺乳类,Y 染色体决定雄性性别,处显性状态。在基因型上,Y 缺如的(XO,XX,XXX)发育为雌性,不管有多少 X 染色体,只要有 Y(XY,XXY,XXXY,XXXXY)染色体存在就发育为雄性。明显的例外是罕见的(1/20 000)XX 男性和更罕见的(1/100 000)     

Detection and characterization of Shiga toxin-producing Escherichia coli in captive non-domestic mammals

Shiga toxin producing-Escherichia coli (STEC) is an important emerging pathogen, and ruminants are recognized as their main natural reservoir. The aim of this work was to establish the frequency of STEC in non-domestic mammals of the Zoo and Botanical Garden of La Plata City, Argentina, and to pheno-genotypically characterize STEC isolates. By polymerase chain reaction (PCR), Shiga toxin (stx) gene sequences were detected in 50.8% of 65 fecal samples. Twenty-five STEC strains were isolated from 38.5% of the Zoo's animals. Ten species of order Cetartiodactyla and one species of order Rodentia were recognized as new STEC carriers. STEC strains belonged to 7 different serotypes including new serotypes O12:H25 and O13:H6. Serotype O146:H28, previously associated with human infections, represented 24% of STEC isolates. The most frequent Shiga toxin identified were type 1c and type 2c. Nineteen strains were positive for iha gene, 8 strains were positive for ehxA gene. Moreover, all strains were positive for lpfAO113 and negative for rfbO157, eae, saa, lpfAO157/OI-141, lpfAO157/OI-154, efa1, and toxB genes. Results obtained by XbaI-pulsed-field gel electrophoresis (XbaI-PFGE) confirmed the transmission of STEC strains among different animal species and suborders. In addition, we observed a potential association between STEC-harboring animal and factors such as belonging to order Cetartiodactyla, living in a pit, and belonging to a non-autochthonous species. This is the first work developed with zoological mammals and STEC in Argentina.     

中江县牛猝死症病因调查

1996年八九月,在中江县黄鹿、富兴、会棚等张镇暴发流行疑似牛猝死症,采集到8份死的牛病料,经采用细菌病、病毒病、中毒病等常检测方法进行系统的实验室诊断,在6份病料中均分离出 氏梭菌、溶血梭菌和溶组织梭菌。     

一起规模猪场仔猪伪狂犬病的诊治

<正>丽江市古城区某规模养猪场的新生仔猪出现高热、呕吐、腹泻、哺乳次数减少等症状。根据发病情况、临床症状、剖检变化、实验室诊断,确诊为猪伪狂犬病。现将诊治情况报告如下。1发病情况该养殖场存栏母猪32头,其中20头为初产母猪。2014年9月2日,有5窝初产母猪产下的仔猪,共计53头,陆续出现呕吐、腹泻、精神沉郁、哺乳次数减少等症状,已死亡48头,死亡率91%。经了解,8月3日该场     

自动化网络化环境下的图书馆书目数据质量控制

严格把好图书分编质量关,提高用户检索效率,是图书馆编目部门应尽的责任,该文结合本人的工作实际,提出了加强图书馆书目数据质量控制的几点见解.     

In vitro antimycoplasmal activity of six Jordanian medicinal plants against three Mycoplasma species

The in vitro effect of six Jordanian traditional medicine plant methanolic extracts were tested against 32 isolates of Mycoplasma species; Mycoplasma mycoides subsp. mycoides LC (6), Mycoplasma capricolum subsp. capricolum (8) and M. putrefaciens (18), all isolated from either nasal swabs or milk, from sheep and goats in different regions in Jordan. All Mycoplasma species showed susceptibility to Artemisia herba-alba and Artemisia arborescens with MIC ranges from 3.125–12.5 mg/ml. Allium sativum and Punica grantum showed limited activity against some Mycoplasma isolates. Olea europea and Citrullus colocynthis showed no in vitro activity against any of the Mycoplasma species tested. Artemisia herba-alba and Artemisia arborescens may therefore be useful for the treatment of mycoplasma infections. The authors are British Civil Servants and as such their work is subject to British Crown Copyright. This means the exclusive copyright for the article cannot be transferred.