草鱼养殖模式对气单胞菌属细菌群落影响分析

为研究草鱼池塘精养、山塘养殖以及鱼菜共生养殖3种养殖模式下气单胞属细菌群落特征差异,2017年5—7月(养殖投喂旺盛期)用采水器在池塘两端和中部采集表层15 cm处水样,混合均匀后,装入灭菌塑料瓶中,低温保存;在池塘两端和中部用采泥器采集表层底泥,现场各无菌称取5g底泥,置于装有135 m L的无菌生理盐水的塑料瓶中,...     

Chemical Composition and Ruminal Digestibility of Ceratoides,a Salt-tolerant Perennial Plant,at Different Years

It has been proposed that salt-tolerant plant could be used as a feed resource for ruminants whereby salt would be removed from salinized land (Asian-Aust.J.Anim.Sci.(2002) 15:998-1001).Ceratoides arborescens (Losinsk.) Tsien et C.G.Ma is known as a drought-and salt-tolerant plant,a kind of shrubs,growing in semi-arid land of Inner Mongolia.Because the covering effect of the perennial plant as a mulch over the soil might be expected,the optimum covering effect would be obtained after the growth period.The perennial plant produces seeds around summer and end its growth thereafter.Nutrient value of the perennial salt-tolerant plant,however,had not been reported in flowering period at different year.It is necessary to know the ruminal degradability of the plants of each growing year in order to determine the regimen to diet for ruminants.The present experiment,therefore,was undertaken to analyze the digestibility and chemical composition of Ceratoides arborescens as feed for ruminants.     

牛弥漫性无败性蹄叶炎的病因、发生和防制

弥漫性无败性蹄真皮炎(蹄叶炎)是牛跛行和不安而造成经济损失的主要原因。蹄叶炎由多种致病因素引起,对大多数病因不十分清楚。给不习惯的牛饲喂易发酵的碳水化合物易诱发该病。被认为涉及到的有组胺、乳酸和内毒素。全身性酸中毒、组胺中毒和内毒素血症形成蹄叶炎的病理生理学特征。主要根据蹄双侧对称性损害和所有患蹄特征性跛行的观察来诊断。眼观损害有蹄背侧壁凹陷、蹄底颜色改变和蹄骨转位。蹄真皮的组织学检查都有变性变化和动脉硬化、此外还有血栓和肉芽组织。对该病可用保守疗法并应用抑制环加氧酶的非类固醇抗炎药进行治疗,通过合理的饲养管理进行防制。     

Effects of perineural capsaicin treatment on compound action potentials of superior laryngeal nerve afferents in sevoflurane-anesthetized dogs

Effects of perineural capsaicin (CAPS) treatment on compound action potentials of the superior laryngeal nerve (SLN) afferents were studied in 6 sevoflurane-anesthetized dogs. Perineural CAPS (100 microg/ml) to the bilateral SLNs reduced (P<0.01) the peak and integral amplitudes of the C-wave of the compound action potential. By contrast, the perineural CAPS had no effect on the A-wave component (P>0.05). Removal of the perineural CAPS recovered the C-wave to pretreatment level. The perineural CAPS treatment selectively blocks C-wave compound action potentials of the SLN afferents, providing a useful tool for studies of laryngeal C-fibers in respiratory physiology.