共查询到20条相似文献,搜索用时 78 毫秒
1.
林海 《四川畜牧兽医学院学报》2004,2(1):16-18
西部特殊的地理环境、脆弱的生态环境、落后的经济发展环境决定了西部城镇建设要走一条不同于东部的特殊道路,即“生态城镇”道路。这是西部经济与生态建设的必由之路。西部生态城镇建设的具体思路是:第一、适度发展城镇的数量、规模;其次、改变生产方式,减轻生态环境的承载压力;第三、调整产业结构,降低经济发展对生态资源的依赖程度;第四、利用现代科学技术,建设生态城镇;第五、加强城镇功能建设。 相似文献
2.
发展草产业关系西部大开发的命运 总被引:10,自引:0,他引:10
总结50年来的实践经验,西部大开发需先抓好草业基础建设,西部生态治理宜走种草为基础,草、灌、乔结合之路。由于草业的基础特点,发展知识密集型草产业可带动西部生态与经济的全面持续发展。为此,急需机制创新。 相似文献
3.
4.
5.
西部大开发中生态环境建设与养羊业协调发展 总被引:4,自引:0,他引:4
生态环境是人类社会赖以生存和发展的物质基础 ,西部大开发必须把生态环境保护和建设放在首位。养羊虽对生态环境造成一定影响 ,但都是因管理不善造成的。羊产品不仅与人民生产息息相关 ,而且具有不可替代的重要作用 ;羊本身是草食动物 ,年产值约 80 0亿元 ,是发展可持续畜牧业的支柱产业。为了加速国民经济发展 ,促进农业产业结构调整和农民增收 ,西部大开发中不能“禁养宰羊” ,而应因地制宜地促进其发展。西部大开发必须走经济保护生态之路 ,如果没有经济开发和利用来保证 ,空洞地谈生态保护是保不住的 相似文献
6.
内蒙古呼伦贝尔市草业发展对策 总被引:7,自引:0,他引:7
近年来,呼伦贝尔市草原退化、沙化日趋严重,已成为制约农牧民生产发展、生活水平提高的重要因素。为此.呼伦贝尔市草业应以国家西部大开发生态环境建设为契机,以畜牧业增产、农牧民增收为目的,强力推进草业生产,“十五”期间,重点实现六大突破、建设六大示范区、推广六项生产技术、实施六大保障措施、开发十个牧草新品种、培育一个草产品大市场,力争在短时间内恢复和改善呼伦贝尔市草原生态环境.实现生态、经济、社会协调发展。 相似文献
7.
加快生态环境建设,走可持续发展道路,是西部开发的重要内容,对草原实行依法管护,是从根本上改善目前内蒙古草原生态持续恶化状问的需要,也是加快内蒙古经济建设,加快西部开发,走可持续发展战略的需要,是保护草原生态资源最有效途径,文中对西部开发内蒙古草原生态资源的依法管护相关内容进行了初步探讨。 相似文献
8.
2002年6月24~29日,由中共四川省委组织部、省林业厅、雅安市委、雅安市人民政府四家联合发起,在雅安市召开了“长江上游生态屏障建设专题研讨会暨绿色雅安行动发展方略论坛”。云、贵、川、藏、渝和青海六省(市区)共300余名代表参加了绿色论坛。会议期间,雅安市人民政府发表了《绿色宣言》,举行了万人签字仪式。会议基本目标是:雅安生态环境质量处于全国领先水平;建成发达的生态产业体系;建设优美舒适的人居环境;形成繁荣的生态文化;打造西部生态经济第一城。为此,全力构筑10个生态经济产业平台,即:生态农业;… 相似文献
9.
分析上林县桑蚕业的现状和存在问题,提出发展现代蚕业的建议:理清发展思路,做好蚕业发展规划;积极借鉴各地成功做法,加大扶持力度;走科技兴蚕之路;走品牌蚕业之路;充分利用资源开发新领域;切实加强桑蚕生态循环经济模式。 相似文献
10.
大叶速生槐堪称“叶饲料之王”和“最廉价的饲料”。在诸类饲料植物中,大叶速生槐是集优质高产、抗旱耐寒、易繁易栽一管,经济价值与生态价值于一体的高产高效物种。经过在全国广大省区的不同生态环境和自然条件下,进行多年栽培试验和加工利用证明,大叶速生槐以其独特的抗旱耐寒、速生丰产和粗放管理性能深受饲料业、养殖业和广大农牧民的喜爱和睛睐。特别是在我国西部农牧区、荒漠区和生态环境恶化的退牧区栽培,其抗旱速生丰产性能遥居各类植物之首。可以预测大叶速生槐成为我国饲料业、草地畜牧业和沙产业的高效产业,成为遏制日益恶化的生态环境,再造一个山川秀美西部的先锋树种。 相似文献
11.
12.
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
13.
14.
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
15.
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
16.
17.
18.
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
19.
20.
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