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松香草属Silphiuml植物是原产北美高草原地带的特有植物种类.1979年中国科学院植物研究所从朝鲜把串叶松香草S. per foliatum引入我国以后,长期生产实践表明,串叶松香草是适应性很广、产草量很高、营养成分较好、利用时间长的优良饲草作物.但是,由于串叶松香草叶片有毛,尤其是生长后期食口性较差,影响了它的广泛应用. 相似文献
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为了探索适合我市牧草业发展的道路,我们对我市种植串叶松香草的加工养畜情况进行了调查。1种草比种粮效益高串叶松香草为多年生植物,种植一次可收获10~15年,每年可刈割4~5茬,每茬产草4000kg左右。据测算:种植一亩串叶松香草按亩年产鲜草15000kg计算,每年收益可达1218元,而种植粮食作物,按亩年产玉米500kg、小麦500kg计算,每亩年可收益才627.4元,而种植串叶松香草却是种植粮食作物的两倍。串叶松香草营养丰富,粗蛋白质含量达15.5%,若按亩产粗蛋白质计算,种1亩串叶松香草相当于种6亩玉… 相似文献
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辽宁省丹东市种畜场经多年试验和实践,根据牧草适应性、产量、饲喂效果等综合评价,确定串叶松香草为北方养猪较好牧草。串叶松香草亦称松香草、菊花草、香槟草,菊科松香草属,多年生草本植物。松香草喜温暖湿润气候,耐寒、热,在我国南方生长良好,在北方也能安全越冬。栽种试验表明,松香草5℃开始发芽,20℃~28℃时生长较快,39℃可正常生长,在-38℃可安全越冬,全国大部分地区都可种植。松香草稍能耐湿、旱,适于在年降雨量450~1000mm的地区生长,根系发达,能吸收土壤深层的地下水,水淹地表4个月仍能缓慢生长。松香草耐酸,抗盐性差,在酸性至中性… 相似文献
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<正>(一)串叶松香草的特性和分布区域串叶松香草简称松香草,别名菊花草。具有产量高、营养价值好、适应性强、繁殖容易、管理简便等优点,是一种很有推广价 相似文献
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一种高产优质饲料──串叶松香草莫静广西北流县畜牧局(537400)串叶松香草,原产北美,为菊科多年生宿根草本植物。1979年引进我国,我们是1985年开始种植。经实践证明,串叶松香草是一种高产、优质、适应性强家畜、家禽、鱼都喜爱吃的饲料作物。串叶松香... 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