On the Presence of Ostertagia Species and Teladorsagia davtiani in Sheep in Canada

The presence of Ostertagia species and Teladorsagia davtiani in Maritime sheep is briefly discussed. The diagnostic features of O. trifurcata and T. davtiani are depicted photomicrographically.     

富硒麦芽硒对二乙基亚硝胺所致大鼠肝癌模型肝硬变前期的肝损伤及伴癌综合征的影响

将体质量100～120g的雄性SD大鼠258只随机分为7组。Ⅰ组，0．3mg／kg富硒麦芽硒组；Ⅱ组，1mg／kg富硒麦芽硒组；Ⅲ组，3mg／kg富硒麦芽硒组；Ⅳ组，3mg／kg亚硒酸钠硒组；Ⅴ组，诱癌阳性对照组；Ⅵ组，3mg／kg亚硒酸钠硒不诱癌组；Ⅶ组，阴性对照组，不加硒也不诱癌。Ⅰ～Ⅴ组，饮水中添加二乙基亚硝胺（DENA，100mg／L）以诱癌。每2周眼眶采血1次，测定血浆丙氨酸氨基转移酶（ALT）、碱性磷酸酶（ALP）、总胆红素（TBIL）、白蛋白（ALB）、葡萄糖和血清钙含量、全血GSH-Px活性等。结果发现，富硒麦芽硒比亚硒酸钠硒能更有效地抑制DENA所致大鼠肝损伤，提高大鼠全血GSH-Px活性，并以1mg／kg添加刺量效果较佳；DENA所致大鼠肝肿瘤初期即伴随着明显的低血糖症。结果表明：富硒麦芽比亚硒酸钠能更有效抑制DENA所致的初期肝损伤，保护肝脏，提高抗氧化能力。     

大熊猫寄生虫病研究现状

大熊猫是我国特有的珍稀濒危物种,寄生虫病是对大熊猫危害较严重的疾病。到目前为止,在大熊猫体共发现26种寄生虫,其中施氏贝蛔虫最为流行,危害也最为严重。文中主要介绍了大熊猫专性寄生虫———施氏贝蛔虫的传播途径、发病条件、感染过程及寄生虫的危害和预防措施。同时还对其他几种对大熊猫构成潜在威胁的几种寄生虫病,如螨病、槽盘吸虫病、钩口线虫病等进行了简要介绍。     

牦牛主要寄生虫的防治

文章对牦牛常见寄生虫病的病原、临床症状和药物治疗进行了概述,指出了目前牦牛寄生虫病防治的不足,并探讨了防治牦牛寄生虫病药物的研制方向。     

Further Observations on the Presence of Ganglion Cells in the Oculomotor Nerves of Mammals and Fish: Number, Origin and Probable Functions

The oculomotor nerves (3rd, 4th and 6th) of some species of fish and mammals have been studied to establish the presence, number, true topography and probable functional role of the ganglion cells located along the trunk. The finding of typical pseudo-unipolar ganglion cells is always unpredictable and extremely variable, from an inter- and intra-specific point of view, in members of the two zoological classes studied.     

我国蒙新区牧草中网蝽科昆虫的寄生情况

蒙新区由于地域辽阔,东西跨度大,其西部耐干旱的草本植物十分繁盛,而东部地区降水较丰富,属温带草原植被类型,组成了我国重要的畜牧业基地。蒙新区的牧草资源每年都不同程度地受到各种牧草害虫的危害,给畜牧业生产带来一定的损失。其中网蝽科昆虫体型较小,且生活隐蔽,不善活动,通常不易被发现,但对植物组织会造成严重的破坏,对牧草的质量和产量均会造成一定的损失,对构成草原植被的其他植物的生长发育也有一定的影响,其危害不可忽视。记录了我国蒙新区草原植被14科43属植物中网蝽科昆虫的寄生情况,共包括网蝽科昆虫13属40种,结果表明,网蝽科昆虫在我国蒙新区寄生的植物种类十分广泛,而且有些科属的植物被多种网蝽寄生。     

桑天牛卵啮小蜂Aprostocetus prolixus的寄生生物学研究

桑天牛卵啮小蜂 (Aprostocetusprolixus)是一个新种 ,对桑天牛有较高的寄生率。观察发现该寄生蜂 1年 2～ 3代 ,老熟幼虫以休眠状态越冬。 6月下旬越冬代的成虫开始羽化 ;第 1代成虫 7月下旬开始羽化 ,8月上中旬为盛期 ;第 2代幼虫一部分以老熟幼虫直接越冬 ;第 2代成虫 8月下旬至 9月中旬羽化 ,8月底与 9月初为盛期 ,所产小蜂幼虫从 9月中下旬开始陆续以老熟幼虫在寄主体内越冬。探明了该寄生蜂的羽化时间、交配、产卵、寄生等行为习性。     

青海省共和县牦牛外寄生虫感染情况调查

2009—2010年,笔者对青海省共和县高寒地区牦牛外寄生虫感染情况进行了调查,抽查的5 687头牦牛中检出外寄生虫有牛皮蝇蛆、颚虱、毛虱、疥螨、痒螨、花蠕形蚤、草原革蜱7种,隶属于1门2纲3目7科7属;感染率分别为24.9%、11.8%、15.4%、7.7%、9.2%、9.4%、5.7%。幼年牛和成年牛外寄生虫的总感染率达84.10%,幼年牛的感染率极显著高于成年牛(P(0.01)。     

The Economics of Dairy Farming in Canada

Government policies affecting the Canadian dairy industry represent a unique solution to a problem of surpluses which exists in most Western countries.

This paper sketches an outline of dairy farming today before examining the trends and structural changes undergone by the industry over the Seventies. Milk yields have increased slightly and total numbers of dairy farmers have halved. After a decade of turmoil in international markets for dairy products, some stability is now returning and dairy farmers appear to be on the verge of a technological leap forward in dairying. By the end of the Eighties there could be no more than 13,500 commercial dairy farms supplying milk in Canada.

Canada, along with other Western countries, produces more milk protein than it needs and different proposals for redressing this imbalance in the Eighties are appraised. One proposal advocates cutting back on domestic production and purchasing butter to make up the difference on the international market. A scheme based on recent British analysis proposes a swing towards Jersey milk production. Lastly the possibility of expanding market demand for products rich in milk protein is examined.

     

肉兔常见寄生虫病的防治

寄生虫有着复杂的生活史,与之相对应的兔寄生虫病更是种类繁多,对此类疾病处理不当会造成严重的损失。文章综述了生产中兔寄生虫病的常见类型及各种病症的流行特点、临床症状,并结合实际经验对其提出了预防及治疗措施。