共查询到20条相似文献，搜索用时 570 毫秒
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1.前言小叶章属于禾本科牧草,在黑龙江东部草原植被中占有很大的比例。但多年来养牛者常在每年8月20日左右收获牧草,此时小叶章牧草已老化,营养价值大为降低。有人曾经对不同收获期小叶章牧草营养含量进行过研究。但是,什么时间收获的小叶章青干草喂奶牛效果最好,笔者未 相似文献
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开发利用松嫩平原小叶章草场张春华，张春芸，孙志敏，孟宪宝（黑龙江省畜牧兽医学校，黑龙江省备牧局）小叶章（Ｄｅｙｅｕｘｉａａｎｇｕｓｔｉｆｏｌｉａ）属于禾本科根茎型牧草，它主要生于沼泽化草甸、低湿地、河流两岸有季节性积水的地段。小叶章草场在我省分布范围... 相似文献
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内蒙古典型草原牧草再生性的研究 总被引：10，自引：0，他引：10
１９９３年在内蒙古正蓝旗典型草原研究了羊草等２０种牧草的再生性，测定了每种牧草的再生草产量、再生速度和再生强度。结果表明，大针茅、麻花头等能再生６－７次，细叶鸢尾，克氏针茅能再生４－５次，小叶锦鸡儿、砂韭再生量很少，牧草的再生速度与水热条件密切相关，７－８月份水热同期，牧草的再生速度最快。通过研究，作者提出了合理利用草地的意见。 相似文献
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小叶章(Deyeuxia Langsdorffii(Link)kunth)是一种喜生于湿性草地的禾本科牧草。成熟的小叶章草可以用来苫房和造纸。6、7月份采集的鲜草,可以调制成饲用干草。在早春4月返青以后,一直到十月份可以放牧。在我县牧民称呼的“马草”、“羊草”、“货草”就是指的小叶章。可见,小叶章不仅能苫房,而且还是一种优良的饲用植物。据调查,我县一百多年以来,就是利用小叶章饲喂马、牛、羊等草食牲畜。历来没有用谷草等作物杆棵喂养牲畜的习惯。 相似文献
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从发展草业的意义和国内外草业发展的现状及趋势，提出黑龙江省在未来5年草业发展的战略是：保护和开发东部小叶章草原，改良和治理西部羊草草原，调整农区种植结构，扩大优质牧草和饲料作和的种植面积；对外积极开拓国际牧草市场，对内积极发展牛、羊、鹅等市场看好的草食畜禽养殖业，提高种养经济效益。 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