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庆阳驴具有体大力强、结构匀称、体态美观、性情温驯、耐苦耐劳等优良特性，深受本市农户喜爱，是驰名的地方优良品种。为了客观、真实地反映庆阳驴资源的最新状况，为科学制定驴产业发展规划和庆阳驴品种资源保护与开发利用规划提供可靠信息和依据，庆阳市畜牧工作站组织专业技术人员对该驴品种现状进行了调查。 相似文献
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为深入了解驻马店市泌阳驴品种资源现状,促进泌阳驴品种资源保护利用健康持续发展,结合2018年泌阳驴种质资源保护利用项目工作,笔者对泌阳驴品种资源现状进行了调研,针对泌阳驴品种保护和利用存在的问题进行探讨研究并提出对策建议。 相似文献
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地方家禽品种是目前国内优质禽产品产业发展的基础，保护利用好地方家禽品种资源，对于家禽业的可持续发展，提高我国禽产品在国际市场的竞争力，满足进入小康生活后的我国国民对优质禽产品需求，均具有十分重要的意义。 相似文献
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1 品种分布和产区概况
隆林山羊是广西优良的地方品种。原产于云贵高原桂西北山区的隆林各族自治县,故称隆林山羊。隆林山羊以体型大、生长快、产肉性能好而著称,是我国南方山羊体格较大的肉用型地方品种。于1986年列入了《中国家畜家禽品种志》、《广西家畜家禽品种志》,正式命名为隆林山羊。 相似文献
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编者按：我国养禽业伴随着共和国改革开放20年辉煌发展节拍，走过了八十年代、九十年代初的引进外国优良品种的高速发展阶段，近年来已步入利用我国地方鸡种消化吸收外来品种的阶段。根据我国形势发展，21世纪将是我国地方品种开发利用的蓬勃发展阶段。本刊曾于1998年NO6、1999年NO18、NO22分别发表“我国地方品种资源──我国家禽生产的立足之本”、“基因抢夺不见炊烟的战争”，“对‘畜禽遗传资源保存和利用’立项研究的建议”，不知是否引起广大读者的重视。本期刊发的下文，将使广大读者更加清醒地认识到，我国优良地方鸡种在历史上… 相似文献
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我国是世界上家禽遗传资源最丰富的国家之一,各地的地方品种鸡约有72个,鸭27个,鹅27个,其中编入《中国家禽品种志》的地方品种,鸡27个,鸭12个,鹅13个。但近20年来,由于引进国外少数专门化高产品系用于生产或对生产性能较低的家禽品种进行杂交,使得这些地方品种逐渐被引进品种和杂交种取代。再加上保护开发投入不足、手段落后等多种因素的综合作用,更加快了家禽遗传资源的濒危程度和灭绝速度。如何保存和利用好我国优良的家禽遗传资源已成为产业部门乃至全社会面临的严峻问题。诸多学者对家禽遗传资源的保存和利用进行了研究,并取得了重大进展。本文拟针对当前的形势,提出了几点看法。 相似文献
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选择中国大陆最早分离的H9N2亚型禽流感病毒(avian influenza virus,AIV)A/Chicken/Guangdong/SS/94(H9N2)(缩写为SS株)和1998年大流行时期分离的H9N2亚型AIVA/Chicken/Shanghai/F/98(H9N2)(缩写为F株)为研究对象,对其在SPF鸡体内的复制能力和传播途径特性比较后发现,F株在4周龄SPF鸡气管中的复制能力高于SS株,F株可以经气溶胶传播途径传播,SS株不能经气溶胶传播途径传播;利用反转录-聚合酶链反应(RT-PCR)方法获取F株和SS株的HA和NA基因的cDNA,序列分析得知,F株和SS株的HA和NA基因的同源性分别是96.6%和98.1%;HA基因的裂解位点氨基酸序列都是PARSSR↓GL,但有5个氨基酸的差异,即166位N(F)→D(SS)、198位A(F)→V(SS)、217位V(F)→I(SS)、335位G(F)→R(SS)、504位L(F)→S(SS);2株病毒的NA基因在63~65位都存在氨基酸缺失,但在NA基因红细胞吸附位点的氨基酸序列不同,分别是IKKDSRSG(F)和IKEDLRSG(SS)。F株和SS株的传播特性差异是否与其表面基因序列有关,有待进一步研究。 相似文献
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禽类的起源、演化及我国主要家禽品种类型与分布 总被引：1，自引：1，他引：0
家禽是重要经济价值动物.本文从禽类种群进化学说出发,简介了禽类的起源、演化、动物学分类和家禽的驯化(养)与品种的形成,并对我国主要家禽(鸡、鸭、鹅)地方品种和培育品种(配套系)的分布与类型作了描述,以期为研究我国家禽起源系统,保护与利用我国家禽品种,促进家禽生产可持续发展提供参考. 相似文献
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近年以来,由于市场因素的刺激,生猪的存养量大幅上升,再加上由于流通环节较多,流通非常频繁,流通距离越来越远。这对繁荣经济,增加养殖效益起了重要的推动作用,但也同时给疾病的感染和传播创造了有利条件,给猪病的防治带来了困难。有的猪场感染了传染病后,由于治疗不及时不得法,而造成了惨重的经济损失。2008年7月中旬,我街道一养猪户因盲目从外地购进中猪,发生猪病疫情,引起猪只连续死亡,造成一定的经济损失。根据流行病学、临床症状、剖检变化和实验室诊断,诊断该病为猪链球菌病和猪伪狂犬病混合感染,现报告如下。 相似文献
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１前言１．１鸡白冠病鸡白冠病是由卡氏住白细胞原虫寄生于鸡的红细胞和单核细胞而引起的鸡的贫血性疾病。吸血昆虫蚋和库蠓叮咬鸡引起传播，是主要的传播媒介，一般在夏末和秋季多发，由于夏季降雨量较大，部分沟渠积水，库蠓和蚋多孳生，因此在多雨水涝的年份发病率明显增高。１９９８年中国从南到北发生洪涝灾害，吸血昆虫的孳生格外严重，出现了一个白冠病多发年，而后两年发病稍轻，并有地区性，今年８月中旬以来白冠病的发病呈抬头趋势，有一定的死亡率，对蛋鸡产蛋率也会引起一定程度的降低，应引起养鸡户的重视。１．２鸡痘鸡痘也是… 相似文献
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Pinard CL Weiss ML Brightman AH Fenwick BW Davidson HJ 《American journal of veterinary research》2003,64(1):104-108
OBJECTIVE: To evaluate lactoferrin and lysozyme content in various ocular glands of bison and cattle and in tears of bison. SAMPLE POPULATION: Tissues of ocular glands obtained from 15 bison and 15 cattle and tears collected from 38 bison. PROCEDURE: Immunohistochemical analysis was used to detect lysozyme and lactoferrin in formalin-fixed, paraffin-embedded sections of the ocular glands. Protein gel electrophoresis was used to analyze ocular glands and pooled bison tears by use of a tris-glycine gel and SDS-PAGE. Western blotting was used to detect lactoferrin and lysozyme. RESULTS: Immunohistochemical staining for lactoferrin was evident in the lacrimal gland and gland of the third eyelid in cattle and bison and the deep gland of the third eyelid (Harder's gland) in cattle. Equivocal staining for lactoferrin was seen for the Harder's gland in bison. An 80-kd band (lactoferrin) was detected via electrophoresis and western blots in the lacrimal gland and gland of the third eyelid in cattle and bison, Harder's glands of cattle, and bison tears. An inconsistent band was seen in Harder's glands of bison. Lysozyme was not detected in the lacrimal gland of cattle or bison with the use of immunohistochemical analysis or western blots. Western blots of bison tears did not reveal lysozyme. CONCLUSIONS AND CLINICAL RELEVANCE: Distribution of lactoferrin and a lack of lysozyme are similar in the lacrimal gland of cattle and bison. Differences in other tear components may be responsible for variability in the susceptibility to infectious corneal diseases that exists between bison and cattle. 相似文献
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Harvey CE 《Journal of veterinary dentistry》2002,19(4):186-195
Crown width, height and buccal surface areas were measured on heads or skulls of four dogs and four cats, and were compared with similar measurements on models of human dentition. Buccal surface area variability was greater in dogs and cats than in humans, and teeth of cats were smaller. Horizontal (gingival and occlusal halves) and vertical (mesial, middle, and distal thirds) buccal surface area variability was also greater in canine and feline teeth compared with human teeth. This increased variability suggests the need for testing of reliability and repeatability of scoring when using plaque and calculus indices based on horizontal or vertical segmentation. Buccal surface area variability between teeth also prompts questioning the validity of equal weighting of smaller, irregularly-shaped teeth when calculating a mean mouth score. Whether equal or more reliable results would be obtained from scores of whole teeth in comparison with segmentation indices used currently has yet to be determined. 相似文献
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Over a period of about 12 years, 30 abnormal Schistosoma mattheei cercariae were found among a total of approximately 2.8 million examined. Initially seven were recovered from about 1.02 million (0.0007%), which were examined individually while being counted with the aid of a stereoscopic microscope. Subsequently, on the strength of relatively high percentages of abnormal individuals recovered when counting cercariae that failed to penetrate into oxen, it appeared that the morphologically abnormal cercariae were unable to swim and would mostly sediment out of a suspension while most of the normal cercariae would remain swimming. This surmise is supported by recovery of 23 morphologically abnormal cercariae (0.001%) from about 1.8 million, by examining the sediment after the cercarial suspension had been left standing undisturbed in glass measuring cylinders. The abnormalities ranged from aberrant tails only (e.g. an underdeveloped tail, or different degrees of schism) or aberrant heads only, to abnormalities of both the heads and tails. A suggested schematic classification of abnormal cercariae is presented. A young, adult hamster was exposed to eight S. mattheei cercariae with complete schism of the shaft of the tail, by pipetting the cercariae onto the shaved abdominal skin of the anaesthetised animal. Two underdeveloped females were subsequently encountered in squash preparations of the liver when the hamster was killed for worm recovery 10 weeks after infection, thus showing that some of the abnormal cercariae were viable. A method is also described for killing and fixing cercariae while retaining some of the shining brilliance of live cercariae, without them becoming shrivelled, granular and semi-opaque, as occurs when cercariae die spontaneously or are killed with heat. This is apparently the first report of abnormal cercariae of S. mattheei. In addition, a method of concentrating abnormal cercariae after emergence from a snail, a schematic classification of abnormal cercariae and a method for killing and fixing cercariae while retaining much of the shiny brilliance of live cercariae are also reported for the first time as far as is known. 相似文献