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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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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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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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文章以湖南省洞口县为例,按照生猪运输车辆洗消中心选址、清洗消毒车间、烘干房、燃油热风机等设备建设要求,进行洞口县生猪运输车辆洗消中心招商建设和运营管理,制订洞口县生猪运输车辆洗消中心工作流程及操作规程。加强运输车辆洗消中心的建设和管理,加强工作人员责任心,正确选择和使用消毒剂(液),严格遵守工作流程及操作规程,做到冲洗房冲洗→消毒房消毒→烘干房烘干三级操作,以及运输车辆、人员和物品的清洗合格,消毒彻底,达到切断生猪调运车辆传播非洲猪瘟病毒的目的。 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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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