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2001年以来,姜堰市在全市范围内开展了蚕茧生产优质化工程,蚕茧生产的整体水平有了显著提高,但以蒋垛镇为代表的老蚕区蚕茧质量波动较大,严重制约了蚕业生产的稳步发展和经济效益的提高。2005年,笔者对蒋垛镇的茧质波动情况进行了全年跟踪调查,现报告如下:1茧质现状从表1可以看出,蒋垛镇蚕茧生产主要存在以下问题:1.1一大一差。即毛折大、蚕茧等级差,增加了原料茧的消耗。1.2二短。即一茧丝长短、解舒丝长短。1.3二轻。全茧量轻、茧层量轻。1.4四低。上茧率低、茧层率低、解舒率低、出丝率低。2原因分析茧质下降,究其原因,我们认为主要在于… 相似文献
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在分析1994~1996年各季茧质指标的基础上,对四川省近两年大多数地区原料茧与以往比较的结果是:春茧丝长短、缫折大、解舒率低、茧丝纤度小;夏秋茧茧质差异大、解舒率低、缫折大,各季茧净度成绩基本在95分以下.针对这些普遍存在的问题,结合在多家丝厂考查的结果,分析了茧质指标对制丝工艺过程及生丝产质量的影响,并提出了适合现行缫丝厂缫丝技术、管理能力的工艺对策,对提高生丝产质量具有一定的参考作用. 相似文献
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一、试验目的: 新区全年饲养二化性白茧蚕种,必须在春、秋两季制种。以往用叶桑育,死活率低,公分产茧低,死笼茧多,担茧制种低。今年针对问题,改为采用了大树尾夏刈,造造枝桑育。 相似文献
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绵茧分为轻绵茧和软绵茧,二者在家蚕茧的品质检定中分别被归为次茧和下茧。以不易与上茧区分的轻绵茧为检测对象,设计基于表面弹性识别的检测设备:首先采用FSG15N1A触力传感器检测轻质摆锤撞击蚕茧特定部位的撞击力信号;再利用INA122精密仪表放大器构建的放大电路放大传感器输出的信号,经由LMC6572低电压运算放大器构建的二阶Sallenkey低通滤波电路进行低通滤波,得到与被检测蚕茧表面弹性有效关联的撞击力幅值与脉宽信息。随机选取相同数量的轻绵茧与上茧进行测试,并对测试结果绘制折线图进行对比分析,结果表明轻绵茧与上茧在撞击力幅值和脉宽的比值上有显著区分度,可作为轻绵茧分选的依据。 相似文献
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微波干燥机烘茧研究初报 总被引：2，自引：0，他引：2
蚕茧干燥是蚕茧生产的重要环节,烘茧所用的机械和方法与茧丝质量、烘茧工效有密切关系.历来蚕茧干燥都是用烘茧灶采用气热干燥法进行,一般分为头烘和二烘,共需5.5～6h,烘茧时间长,操作烦琐,工效低,且对茧丝有不良影响.
微波干燥是一种先进的加热干燥技术,具有热效率高、处理时间短、干燥均匀一致、对加 相似文献
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<正> 我省年收鲜蚕茧9万多吨,干燥由1700余个茧站的4000多副烘茧灶(机)承担,其土灶静置辐射热烘茧占99％,对烘茧主要工艺参数(温度和烘率)的检测,长期靠一般温度计和剖茧验蛹来检测判断。其方法原始,耗能高,工作环境恶劣,效率低,验蛹损坏大量蚕茧(据测算,全省年损失蚕茧达45吨,直接经济 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献