Diarrhearemainsoneoftheleadingcausesofneonatalmortalityinswine下痢一直是新生仔猪死亡的主要原因DefinitionofDiarrhea,muchofthefluidisabsorbedinthesmallintestinebeforeitexitstheileum通常,大部分水都在进入回肠之间就在小肠中被吸收了Colonservestoconservewaterandelectrolytes结肠只起吸收水和电解质的作用MechanismsofDiarrhea下痢的机理SecretoryDiarrhea分泌性下痢Resultoftheeffectofenterotoxinssecretedbybacteriaandsomeviruses细菌和其它病毒分泌的肠***造成的结果Alterationinsecretionofelectrolytes,water,andbicarbonate:gradientpullswaterintolumen电解质、水和碳酸氢钠的分泌发生改变:使水进入肠腔Absorptioncontinues:ChyleinlymphaticsMechanismsofDiarrhea下痢的机理MalabsorptiveDiarrhea吸收不良性下痢Reductioninsurfaceareaofintestine“diedduringthenight”不要从夜间死亡的猪采集病料SelectingSegmentsofIntestine肠段的选择Histopathology组织病理学Sectionsrepresentativeofallareasofintestines要选择能代表肠道所有区域的部分Bettertohavemanysmallpiecesthanonelargepiece最好要采集多个较短肠段,而不要只采集一个很长的肠段Segments~1cmlong,openedlengthwise根据纵向尺寸的不同,采集1厘米左右的肠段
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