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本研究运用环境综合比较优势指数法对湖南省2000年、2013年不同生猪养殖产区的比较优势及其变化进行了分析,结果表明,2013年与2000年相比长沙市、株洲市、邵阳市、张家界市、郴州市、怀化市和湘西自治州7个市州的环境综合比较优势上升,其中株洲市、张家界市、郴州市、怀化市和湘西自治州的EAAI(环境综合比较优势指数)均大于1,具备生猪生产的环境综合比较优势;湘潭市、衡阳市、岳阳市、益阳市、永州市和娄底市6个市的环境综合比较优势下降,且EAAI均小于1,不具备生猪生产的环境综合比较优势;常德市的EAAI相对不变,为0.84,不具备生猪生产的环境综合比较优势。因此,今后一段时期湖南省生猪产业发展的重点优势区域是以郴州市为重点的湘南产区、以张家界、怀化市、湘西自治州为重点的湘西产区,以及株洲市的丘山区。 相似文献
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文章运用环境综合比较优势指数法对湖南省不同生猪养殖产区的比较优势及其变化趋势进行了分析,长沙市、株洲市、邵阳市、张家界市、郴州市、怀化市、湘西自治州7个市州的环境综合比较优势处于上升趋势,其中株洲市、张家界市、郴州市、怀化市、湘西自治州的EAAI均大于1,具备生猪生产的环境综合比较优势。湘潭市、衡阳市、岳阳市、益阳市、永州市、娄底市6个市的环境综合比较优势处于下降趋势,且EAAI均小于1,不具备生猪生产的环境综合比较优势。常德市的EAAI相对不变,均为0.84,不具备生猪生产的环境综合比较优势。由此提出,今后一段时期湖南省生猪产业发展的重点优势区域是以郴州市为重点的湘南产区、以张家界、怀化市、湘西自治州为重点的湘西产区,以及株洲市的丘山区。 相似文献
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农业部发布的4 000个监测点的信息显示,2013年7月生猪存栏环比增加1.2%,同比增加0.6%;其中,能繁母猪存栏环比增加0.2%,同比增加1.3%(图1)。从数据上看,生猪养殖市场仍未正式进入去产能阶段,母猪存栏下降缓慢,生猪存栏绝对数量和增速都呈回升趋势。2013年1～7月,除2月外,其余月份生猪存栏量呈现上扬态势。1～7月生猪存栏呈现先减少后增加的态势。1月全国生猪存栏为46 462万头,2月生猪存栏略低于1月,为45 589万头,也成 相似文献
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用PCR检测长沙市猪肺炎支原体和猪鼻支原体的感染情况 总被引：1，自引：0，他引：1
为对长沙市猪支原体肺炎病原流行病学进行初步调查,用PCR方法对从湖南省长沙市5个县（市、区）205头猪中收集的326份病料（205份猪肺和121份猪鼻拭子）分别进行了猪肺炎支原体和猪鼻支原体检测,并对部分基因进行了序列分析。结果发现,猪肺炎支原体检出率为24.4%（50/205）,猪鼻支原体检出率为22.3%（27/121）;长沙市每个县（市、区）的生猪中均存在这两种支原体,其中长沙县生猪阳性率最高（42.4%和31.5%）;序列分析表明,检测出的基因序列与国内外相关序列有97%～100%的同源性。本试验证实了猪肺炎支原体和猪鼻支原体在长沙市猪场的存在。 相似文献
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笔者根据2004—2013年《湖南省调查资料》中的生猪饲养中间消耗数据,分析了其变化趋势。结果表明,湖南省生猪饲养的中间消耗总体呈上升趋势,其中,物质消耗在92.31%~99.20%之间波动,总体呈上升趋势;生产服务支出在0.80%~7.69%之间波动,总体呈下降趋势;生猪饲养的用种费用、饲料费用、疾病防控费用、栏舍设施维修费用呈逐年增长趋势;燃料、用水、用电、外雇运输、配种、技术服务等费用呈下降趋势。 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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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
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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