共查询到20条相似文献，搜索用时 62 毫秒
1.
一年生黑麦草品种在贵州南部的引种试验 总被引：4，自引：0，他引：4
对国内14个一年生黑麦草品种在贵州南部独山地区进行引种试验比较。结果表明:各参试品种均能良好生长,安全越冬。一年可刈割4～5次,鲜草产量58429.2～84842.4kg/hm2,多数品种2、3、4月鲜草产量较高,2月份产量在20000kg/hm2以上的就有5个。综合性状表现较好的依次为:抗锈王,邦德,凯牧,沃土,特高,杰威和海湾等,可以在贵州大部分地区栽培利用。 相似文献
2.
西藏拉萨河下游地区紫花苜蓿引种试验研究 总被引：1，自引：0，他引：1
在西藏拉萨河下游地区的达孜县对7个紫花苜蓿(Medicago sativa)品种进行了引种试验,测定了不同紫花苜蓿品种的生育期、株高、越冬率及草产量等,通过2008～2009年的品种间比较试验,结果表明:7个紫花苜蓿品种均可以完成生育期,但成熟种子均很少。供试的紫花苜蓿品种在西藏拉萨河下游地区均可安全越冬,第一年的越冬率均超过80%,第二年的越冬率都超过了90%。7个紫花苜蓿品种草产量在第二年较高,鲜草产量在14000.0～21000.0kg/hm2之间,干草产量在5200.0～9500.0kg/hm2之间。其中鲜草产量和干草产量最高的为中兰1号,分别为21000.0kg/hm2和9500.0kg/hm2。 相似文献
3.
4.
贵州喀斯特地区牧草引种试验评价 总被引：10，自引：0，他引：10
对国内外引进的6个禾本科牧草品种,9个豆科牧草品种以及喀斯特地区的4个对照品种,在贵州独山地区进行引种试验。结果表明：各参试品种生长良好,能安全越冬、越夏,一年可刈割5～6次,鲜草产量达36558．2～66450．0kg／hm2,干草产量10771．0～19869．0kg／hm2。综合性状表现较好的依次为鸭茅Totter,Wana,Tuoa;多年生黑麦草Nui,Bronsys;白三叶Alice,C6151,Prop,Pitua,Sustain;百脉根Mareb,Lel。 相似文献
5.
6.
7.
18个苜蓿品种在青海高原的比较试验 总被引：2，自引：0，他引：2
2009-2010年在青海高原对18个苜蓿(Medicago sativa)品种进行比较试验,结果表明,种植第1年开花初期单株根长22.6～31.9 cm,根粗4.1～8.8 mm,单株分枝数4.1～6.8枝,株高43.9～80.1 cm,品种间差异不显著;种植第2年开始进入丰产、高产期,单株分枝数增加1.5～10.5枝,第1次刈割时株高在110.7～145.4 cm,比第1年第1茬高1倍,三得利、德宝、WL232品种表现最优;第2年全年鲜草产量和干草产量居前3位,鲜草产量在106 614～121 364 kg/hm2,干草产量在30 761～34 934 kg/hm2;美国杂花、德福32IQ、赛特、农保和阿尔冈金居第4~8位,鲜草产量91 922～10 282 kg/hm2,干草产量为25 410～29 036 kg/hm2,优于其他品种,表明这些苜蓿品种适宜青海高原东部农业区推广种植。 相似文献
8.
通过对白三叶、多年生黑麦草等9个草种的18个品种进行混播,得出豆科牧草年鲜草产量大于禾本科牧草,其中以豆科牧草白三叶的Lisepa品种年鲜草产量最高,为122 279.4 kg/hm2。同时禾本科与豆科牧草混播,施磷可使草群中白三叶明显增加,增产显著。氮、磷混合施用,施氮180 kg/hm2、磷120 kg/hm2时增产鲜草21 429.0 kg/hm2,干物质收获量达14 656.5 kg/hm2以上。 相似文献
9.
为筛选出适合河南郑州地区种植推广的黑麦草品种,对14个黑麦草品种从产草量、抗病虫害抗倒伏等方面进行了比较研究,结果表明:"瑞奇思"产量最高,其鲜草产量为188785.44 kg/hm2干草产量为24542.11 kg/hm2,其次是"佳美"、"钻石T"、"泰德",且这些高产品种无明显病虫害,值得郑州地区推广. 相似文献
10.
玉米与菊苣不同密度间作试验 总被引：3，自引：1，他引：2
采用二因素饱和D最优设计,进行粮食作物玉米Zea mays与牧草菊苣Cichorium intybus cv. Puna不同密度间作试验,将试验数据建立玉米籽粒产量与玉米密度、菊苣密度的回归模型和菊苣鲜草产量与玉米密度、菊苣密度的回归模型。解析回归模型得知,当玉米密度为22 966株/hm2,菊苣密度为11 1851株/hm2时,玉米籽粒产量为5 993.69 kg/hm2;菊苣密度为258 834.3株/hm2时,菊苣鲜草产量为106 014.51 kg/hm2,玉米密度对菊苣鲜草产量的影响呈负增长效应。以玉米籽粒产量和菊苣鲜草产量同步增长为目标,对回归模型进行模拟寻优,提出实现玉米、菊苣共同增产技术方案,即玉米籽粒产量≥5 475 kg/hm2、菊苣鲜草产量≥82 500 kg/hm2时的玉米、菊苣间作密度为玉米43 446～50 499株/hm2、菊苣105 713～204 158株/hm2。 相似文献
11.
12.
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
13.
14.
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
15.
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
16.
17.
18.
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
19.
20.
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