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综述了生态环境遭受破坏面临的严峻现实和主要因素 ,山羊养殖现状 ,天然林保护工程和退耕还林还草工程的实施与山羊养殖发展的关系及对策。 相似文献
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山羊传染性胸膜肺炎是一种由支原体引起的山羊传染病（俗称烂肺病）,是山羊特有的接触性传染病,该病特征为高热、咳嗽、胸膜发生浆液性和纤维性炎症及渐行性消瘦,病死率高达60％-93．8％。随着重庆市东北、东南两翼农户万无工程的实施,有关区县将山羊养殖作为万元增收工程的萤要项目之一。在渝东北、渝东南两翼得到迅速发展,但在发展山羊养殖过程中,羊病防治特别是山羊传染性胸膜肺炎的防治是关系到山羊养殖业发展能否成功的影响因素之一,做好山羊传染性胸膜肺炎防治对于万元增收工程成败至关重要,为此我结合工作实际和查阅大量资料的基础上对山羊传染性胸膜肺炎防治作如下概述。 相似文献
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毕艳红 《养殖与饲料．饲料世界》2019,(3):29-30
山羊养殖是我国养殖业的支柱之一,为了促进山羊养殖业的高速发展,本文从山羊养殖基地的选址及建造、山羊品种的挑选、山羊饲养的方式等方面详细阐述了山羊集约化养殖的技术,以期帮助养殖户提高养殖技术,从而提高山羊养殖的经济效益。 相似文献
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《畜牧兽医科技信息》2021,(5)
正山羊养殖的综合效益比较高,投资也较少、风险比较低。近几年,山羊养殖数量增多,养殖规模也逐渐扩大。但因我国的山羊养殖行业起步比较晚,在养殖的过程中还有问题需要解决。本文首先简要分析了山羊养殖规模化发展中存在的问题,从两个方面分析了山羊养殖的规模发展策略,供参考。1山羊养殖规模化发展存在的问题 相似文献
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山羊养殖综合效益高,因其养殖风险较低.这些年,更多人参与山羊规模养殖中去,山羊养殖数量更是高涨.但是,山羊规模养殖起步较晚,各项技术有待完善.文章分析山羊养殖的规模化发展中存在的问题,针对性提出相应的发展对策,以供参考和借鉴. 相似文献
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近年来,随着养殖业的发展,山羊养殖户也逐渐增多,而山羊的养殖也越来越颇具规模化、专业化。同时,由于山羊肉质细嫩,营养丰富,因而市场需求不断。市场的需求就意味着养殖山羊利润丰厚,而为了满足市场需求,追求利益,山羊养殖户就更加大规模地养殖山羊,而庞大的羊群需要建设羊舍。那么,鉴于山羊品种众多,下面主要就以波尔山羊羊舍的建造和养殖波尔山羊的利润这两方面的问题进行探究。 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