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为研究生理活性物质Ab-01对提高家蚕生产性能的效果,给5龄蚕作添食试验。结果:添食区全茧量、茧层量、茧层率和干壳量分别比对照区提高了6.3%、7.7%、1.3%和2.2%,处理间全茧量、茧层量的差异均达到显著水平。试验表明5龄添食Ab-01具有增产、增丝和增值的作用。 相似文献
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在5龄蚕第3天起添食500倍、750倍、1000倍、1250倍不同浓度的蚕用蜕皮激素,试验结果表明:对家蚕的结茧率和虫蛹率没有影响;同一天添食不同浓度的试验区5龄经过没有差异。在蚕没有见熟时添食蚕用蜕皮激素,家蚕的5龄经过比对照会缩短16小时左右,蚕茧的全茧量、茧层量和茧层率会降低,一茧丝长短,解舒率低,净度偏低,丝质下降,蚕茧产、质量下降,养蚕效益降低。但在家蚕见熟5%时给蚕添喂蚕用蜕皮激素一次,浓度为1250倍,对蚕茧产量和质量影响不大,可以促进整批蚕上蔟齐一,节省劳力,便于集中上蔟和管理。 相似文献
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《中国蚕业》2016,(2)
为了确定一种适合生产彩色茧的色素配方,利用中性红、酸性红、赤鲜红、吖啶黄、碱性嫩黄和茜素黄等色素分别配制成红色、橙色1号、橙色2号和黄色4种不同色素组合,喷洒于新鲜桑叶上;同时设置100(A组)、500头/匾(B组)2种饲养密度,从5龄第3天开始连续添食,直至上蔟。用4种不同色素组合的不同浓度溶液喷洒后的桑叶,分别于5龄第3天添食家蚕,24 h后逐日调查幼虫和丝腺的着色情况及蚕茧颜色,研究添食不同色素组合、不同饲养密度对蚕茧着色和质量的影响。结果显示,A组蚕茧的各项茧质成绩均高于B组,A组和B组的平均茧层率由高到低的顺序均为橙色2号区(24.17%,23.96%)黄色区(24.09%,23.79%)红色区(23.86%,23.53%)对照区(23.84%,23.45%)橙色1号区(23.58%,23.21%),表明给5龄蚕添食橙色2号色素组合溶液有利于提高蚕茧质量,添食红色、黄色色素组合溶液对蚕茧质量无显著影响,添食橙色1号色素组合溶液蚕茧质量有所下降。 相似文献
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应用EM有效微生物菌剂对5龄家蚕进行添食.结果:促进5龄蚕体重的增长;提高茧质,特别是对全茧量和茧层量的提高较为显著.试验表明以 0.l%EM菌剂于5龄期作连续添食最为实用. 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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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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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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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
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