猪常见寄生虫的形态特征VIP免费

ExperimentⅡTheMorphologicalFeaturesoftheParasitesinPigs翁亚彪华南农业大学兽医学院猪常见寄生虫的形态特征1.Ascarissuum（猪蛔虫）Itisbyfarthelargestnematodeofthepig.猪蛔虫是猪体内最大型的线虫，注意与巨吻棘头虫相区别。Ascarissuumegg（猪蛔虫卵）Theouterlayeroftheeggisirregularlymamillated.虫卵表面凹凸不平，呈蜂窝状。2.Trichurissuis（毛首线虫）Theadultsarewhip-shaped.成虫前部细小，后部粗壮，呈鞭状。Trichurissuisegg（毛首线虫卵）Theeggsarelemonshapedwithconspicuousplugateachend.虫卵呈橄榄形，两端有卵塞。3.Trichinellaspiralis（旋毛虫）Thepresenceofcoiledlarvaeinstriatedmuscle.旋毛虫幼虫卷曲寄生于横纹肌内，形成包囊。4.Fasciolopsisbuski（姜片吸虫）Thebodyislargeandthick.虫体肉质肥厚，形似姜片。Theventralsuckerisveryclosetooralsucker.Theovaryandtestesaremuch-branched,butcecadonothavediverticular口、腹吸盘距离近；卵巢、睾丸高度分枝；肠管不分枝。OralSucker（口吸盘）VentralSucker（腹吸盘）Testis（睾丸）Ovary（卵巢）intestine（肠管）Fasciolopsisbuskiegg（姜片虫卵）Theeggisoval,operculate,yellowandlarge.虫卵呈卵圆形，金黄色，为猪的最大型虫卵。5.Cysticercuscellulosa（猪囊尾蚴）Thecysticercusisgreyishwhite,about1.0cmindiameter.Thereisascolexonthewallofcysticercus.猪囊尾蚴呈灰白色，黄豆般大小，囊壁上有一反凹头节。猪带绦虫头节（Taeniasoliumscolex）Rostellum（顶突）Sucker（吸盘）Hook（小钩）6.Cysticercustenuicollis（细颈囊尾蚴）Thecysticercusisgreyishwhite,about8.0cmindiameter.Thereisascolexonthewallofcysticercus.Thebladderofthisparticularspecieshasanattenuated“neck”region.细颈囊尾蚴呈灰白色，鸡蛋般大小，囊壁上有一反凹头节，颈部细长。7.Coccidia（猪球虫）TheoocystsofIsosporasuiscontain2sporoblasts.TheoocystsofEimeriacontain4sporoblasts.猪等孢球虫含2个孢子囊，艾美球虫则含4个孢子囊。Isosporasuis（猪等孢球虫）Eimeria艾美球虫8.Balantidia（小袋虫）Thetrophozoiteis50–150μmlong,withrowsofciliacoveringitssurface..Thecystissphere,withathickandtransparentcyst-wall.滋养体体表有短纤毛；包囊囊壁厚且透明，有一腊肠样核。trophozoite（滋养体）包囊（cyst)9.Toxoplasmagondii（弓形虫）Inonehostcelltheremaybe8–16Tachzoites,eachmeasuring6.0–8.0μm，anditiscrescentmoon-like.速殖子呈月牙状，胞核紫红色，胞浆浅蓝色。Tachzoites（速殖子）9.Toxoplasmagondii（弓形虫）Thebradyzoitesarelancetshapedandseveralthousandsmaybepresentinonecyst.缓殖子呈柳叶状，数千个于同一包囊内。Bradyzoites（缓殖子）10.Sarcoptesscabie（猪疥螨）Adultshave4pairsofshortlegs,ofwhichthethirdandfourthpairsdonotprojectbeyondthemarginofthebody.成虫有4对粗短的足，特别是第3、4对足不超出体缘。作业：从猪粪涂片中检出各种常见寄生虫或虫卵，并描绘出来。