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串叶松香草生长特性及栽培技术 总被引:3,自引:0,他引:3
串叶松香草(Silphium Perfoliatum L.)为菊科多年生草本植物,具有耐酸、耐盐碱、耐热、耐寒、再生力强、栽培容易、鲜草量高、营养丰富及利用年限长等特点。在苏北沿海地区条件下,单株稀植株高1.5米左右,叶片30片左右。一般单株可产生5~7个分枝。栽培利用方面应注意以下几点:1.选择适当的播种方法即:直播、育苗移栽或利用根茎的萌发作用分根移栽。直播的每公顷用种3~4.5公斤。2.加强田间管理及肥水管理;3.合理刈割,一般在本地区以3~5次为宜,累计公顷产鲜草可达75000~90000公斤;4.在利用方式上,一般应采用青贮方法效果较好。 相似文献
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籽粒苋易种植,在干旱、盐碱、瘠薄的土地上都能顽强生长。籽粒苋株高可达2米左右,一般主茎粗达4厘米左右,如土质肥沃,其主茎粗可达5厘米。据测定,籽粒苋的蛋白质含量达18.7%,脂肪7.5%,淀粉60%,粗纤维10%,灰分3.5%。总的营养价值是高粱和玉米的1.66倍。特别是赖氨酸的含量远远高出其它粮食作物。种植1公顷籽粒苋可产籽4250~4500千克,产青饲料达10万多千克。现将寒地栽培籽粒克新技术介绍如下。1.育苗:实践证明,育苗移栽法要比直播提早15~20天,即5月上旬进行温床育苗。苗高15厘米左右即可移栽。这样缓苗快.成熟早,… 相似文献
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一、羊舍建筑标准 地面要求干燥、平整.便于清理。一般部采用黏土地面,便于去表换新.但这种地面易潮湿.不易消毒,砖石墙壁或土墙均可,可根据当地情况和经济条件决定.高度一般为2-3米.寒冷地区低些.气温高的地区可高些。门宽1.5米左右、高1.8米左右;窗户的面机一般较大(产羔室可小些),便于通风.具体面积可根据当地的气候条件而定.窗台离地面1~1.2米.羊舍要避风向阳.靠近水源. 相似文献
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甘肃河西五种甘草属植物的植物学特性及药用价值研究 总被引:3,自引:0,他引:3
为探索5种甘草属植物在甘肃河西地区的生态适应性及药用价值,以栽培甘草、胀果甘草、光果甘草、刺果甘草及黄甘草为研究对象,对其植物学特性及根部甘草酸、甘草苷含量进行比较研究。结果表明,在甘肃河西地区栽培的5种甘草属植物学特性差异明显;刺果甘草主茎高、小叶数及地上部分鲜重最高,黄甘草居最低水平;甘草根长显著高于其他4个种,但根部鲜重与光果甘草、胀果甘草及刺果甘草无显著差异;甘草酸、甘草苷含量均为3年生比2年生显著增加;3年生根中甘草酸含量除刺果甘草含量最低,其他4个种均达到药典标准,而甘草苷含量则只有甘草达到药典标准。综合各农艺性状和活性成分指标,认为在甘肃河西荒漠化地区,甘草具有较好的生态适应性,可作为甘草药材的基源植物推广种植,而刺果甘草则可作为河西地区重要的防风固沙作物。 相似文献
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草鱼网箱快速养殖是近几年兴起的一项养鱼新技术.它投资周.期短、效益高、好管理、易推广.一般0.2~0.3干克的鱼种经4~5个月的网箱精养,每尾体重可达1.5~2.5千克.一个网箱(30平方米)可产鲜鱼750千克左右.利润4500~5200元。一、养殖方法1.水域选择:选择水库、河坝、大池塘等.将网箱设于避风向阳、水质清洁、有微小流水、水深2.5~3米的地方。选择河坝时.网箱应设在洄水缓流区域.避开急流。2.鱼种投放:以草鱼为主体.适当搭配少量鳙、鲤、青、鳊、鲢等。网箱在鱼种投放前10天设置好,使其附着藻类变得润滑.不伤鱼体。… 相似文献
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苜蓿产草量高,适口性好,营养价值列牧草之首.所以又称为“牧草之王”。它不仅含有丰富的蛋白质、矿物质和维生素等重要的营养成分,而且含有动物所需的必需氨基酸、微量元素和未知生长因子。在相同的土地上,紫花苜蓿比禾本科牧草所收获的可消化蛋白质高2.5倍左右,矿物质高6倍左右,可消化养分高2倍左右,而且含有其他饲草缺少的维生素和钙、磷等,是饲料中的上品。与其它粮食作物相比,单位面积营养物质的产量也较高,是奶牛生产中廉价高效饲料资源。农户如果利用优质苜蓿干草饲养奶牛,每吨苜蓿可转化为1~1.5吨鲜奶,产生效益1500~2300元,可增值1000~1800元。此外,紫花苜蓿喂奶牛,不但可以提高产奶量,还可以提高奶牛健康水平,减少生殖疾病和消化疾病.可以延长奶牛使用年限。 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