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金湖县历来有“鱼米之乡”的美称,水稻是我县的主要农作物。自1993年以来,由于受农药污染的影响,中秋蚕饲养中毒现象普遍发生,蚕农怨声载道。到2003年,我县被迫取消了中秋蚕,每年只饲养二季蚕,即春蚕和晚秋蚕。随着养蚕次数的减少,蚕农收入下降,蚕桑效益与其它农作物相比失去了明显优势,蚕桑生产稳定的形势也变得不容乐观。为巩固和发展我县的蚕桑生产,提高桑园单产效益,2007年春我们引进了“二春蚕”饲养这一做法,进行了二春蚕的饲养实践,现对推广二春蚕饲养谈一点体会。1二春蚕推广饲养的优势1.1二春蚕期的气候适宜,蚕作安全二春蚕的饲养正值6月份,气温一般在25~30℃,气候条件相对夏蚕、中秋蚕而言比较适宜,而且大田农作物未到农药使用高峰期,蚕作十分安全,正好适合二春蚕的饲养。1.2二春蚕的经济效益高于夏蚕和中秋蚕夏蚕期由于高温多湿,蚕茧产量极低,经济效益差。中秋蚕由于水稻多次使用农药,造成大环境的污染,蚕中毒现象屡见不鲜,甚至绝收。通过实践,饲养二春蚕,桑叶质量优良,蚕茧产量和春蚕相当,蚕茧质量略逊于春茧,但明显好于中秋茧,总的效益高于夏蚕和中秋蚕。1.3桑叶硬化延迟,有利于晚秋蚕生产由于春蚕和晚秋蚕相差3个半月左右的... 相似文献
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为巩固和发展蚕桑生产,提高桑园效益,2007年春金湖县蚕桑技术指导站进行了二春蚕的饲养实践.现对推广二春蚕饲养谈一点体会. 1 推广饲养二春蚕的优势 1.1 二春蚕期的气候适宜,蚕作安全 二春蚕的饲养正值6月份,气温一般在25~30℃,气候条件相对夏蚕、中秋蚕而言比较适宜,而且大田农作物未到农药使用高峰期,蚕作十分安全. 相似文献
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蚕桑生产是淳安县传统优势产业,是农民家庭收入的主要来源,是有效解决农村中、老年劳动力出路的重要途径.该县30个乡镇都有蚕桑生产,共有2.36万户种桑养蚕农,约占全县总农户的五分之一.全县拥有桑园3733 hm2,其中连片大田种桑面积1800 hm2,建成了唐村、浪川两个67 hm2蚕业示范园区,2003年饲养蚕种10.3万张,生产蚕茧4208 t,蚕茧产值7370万元,蚕桑产值10533万元,蚕茧质量连续7年名列浙江省前茅,"千岛湖"品牌茧2003年度被浙江省技术监督局认定为浙江名牌产品. 相似文献
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诸暨蚕业历史悠久,粮、桑、茶、生猪曾为诸暨的四大传统拳头产品.1993年全市发放蚕种达8.46万张,生产蚕茧2835t,成为浙江省十大蚕茧生产县市之一.随后几年由于乡镇工业、家庭企业和第三产业的迅速发展,农村产业结构发生了较大变化,蚕桑生产一路下滑,至1999年全市实发蚕种仅21790.6张,生产蚕茧909.8t,蚕桑生产已岌岌可危.借鉴近邻县市绍兴、义乌、肖山等经济发展较快地区蚕桑生产迅速萎缩消亡的经验教训,提出了如何在经济较发达地区稳定和发展蚕桑生产,市蚕桑站于2000年开展了"十村百户兴蚕工程"项目的实施.在全市蚕桑重点乡镇中有代表性地区选择10个村、100个户作为科技兴蚕的重点指导对象,旨在通过以点带面,推动蚕桑生产向专业化、规模化、效益化发展.通过5年来的工作和实践,进行了有益的探索,现将结果报告如下. 相似文献
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一般年份两秋蚕发种量是春蚕的1·6倍,蚕茧产量是春蚕1·4倍,因此,稳定秋蚕生产,提高秋蚕茧质量,是提高蚕桑经济效益的一项重要措施。1秋蚕茧质下降的原因1·1养蚕布局是影响秋蚕生产的重要因素。目前,我县农村秋蚕主要以晚秋为主,中秋为辅,中秋出库时间是8月10日左右,饲养量是春蚕的0·3倍。晚秋蚕出库时间在9月10日左右,饲养量是春蚕1·2倍。这种布局存在着蚕期间隔时间短、大小蚕套养、无法彻底消毒、小蚕共育无适熟叶,桑园治虫难度大等问题,也是导致秋蚕产量不高茧质不好的主要原因之一。1·2饲养管理粗放引发蚕病而影响茧质。秋蚕农村… 相似文献
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青石乡是我县的蚕茧重点产区,蚕桑生产占农业总收入的三分之一左右.在党的十一届三中全会以后,蚕桑生产发展较快,1980年全乡产茧量突破万担关.1983年蚕桑生产虽然遭受到多种自然灾害影响,春蚕缺叶、夏蚕饲养蚕种减少,但由于全面实行了联产承包责任制,广大承包户培桑养蚕积极性很高,努力和自然灾害作斗争,减轻了损失, 相似文献
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重庆市涪陵区的蚕桑生产经过近20年来的持续发展,已初具规模,并不断发展壮大,已成为重庆市最大的优质蚕茧基地,全区80万农民中有近20万人从事蚕桑种养业,蚕茧总量近5年来居川渝两省市各区(市)县第一位,经济总量仅次于榨菜产业,成为涪陵区农业的四大支柱产业之一.涪陵蚕业始终以"桑菜"套种为主,四边桑、高产示范园、集中成片桑园为辅的蚕业生产模式,形成了较好的生产规模,近几年全区的蚕种饲养量基本稳定在12万盒左右,同时,涪陵区桑树基础不断加强,基地建设得到有效巩固.但是,随着工业的发展,涪陵经济相对发达的沿江地区桑园从2004年春季开始出现了大面积的工业废气污染,涪陵李渡及周边乡镇的桑叶遭受了氟化物污染和严重的酸雨影响,蚕桑生产不能正常有序开展,蚕农收入明显下降,经济损失惨重,也使涪陵的蚕业生产遭受了有史以来最严重的问题. 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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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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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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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