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本文报导了1998--2001年在西藏那曲地区草原站，对从国内外引进的73个优质牧草品种进行引种栽培试验，通过物候期、覆盖度、密度、再生速度、频度、高度、产草量、品质特性及抗逆性等试验分析，筛选出了适应那曲地区高寒气候生态条件下推广种植的优良牧草——新麦草SYN-A、新麦草Mankota、新麦草boxoisky-select、吉生一号羊草、吉生三号羊草(多年生)、巴西燕麦、加拿大燕麦、丹麦444燕麦(当年生)共8个品种。其中长势表现较为突出的有3个当年生燕麦牧草品种。对此，试验又对三个当年生牧草品种进行33．33ha的区间试验，并对区间试验进行管理、测产等，表现极佳。从而为那曲地区开展大面积人工种草和草地改良，并对牧草品种选择提供了科学依据，对全地区草地畜牧业的可持续发展和草地生态环境的保护将起到重要作用。 相似文献
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为解决松嫩平原优质羊草（Leymus chinensis）种质资源匮乏的问题，自1996年起，黑龙江省农业科学院畜牧兽医分院牧草育种课题组历经18年，育成了龙牧1号羊草新品系，以中科1号羊草和吉生1号羊草为对照，于2017年进行国家草品种区域试验，同时在黑龙江省不同生态区开展了生产试验研究。结果表明：在黑龙江省不同生态区生产试验中，龙牧1号羊草的越冬率为99% ～ 100%，其中在佳木斯市的干草产量最高，为11896.15 kg/hm2。在国家草品种区域试验中，龙牧1号羊草产量最高，为6536.80 kg/hm2，与中科1号羊草和吉生1号羊草相比，分别增产10.01%、9.13%，其中在吉林白城的产量最高，为10268.33 kg/hm2。鉴于龙牧1号羊草的耐寒适应性较强，饲草产量较高，可作为东北寒区人工草地建植、退化草原改良的优质牧草。
[关键词] 羊草|龙牧1号|生产试验|区域试验 相似文献
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近年来,随着我国畜牧业的大力发展,饲草饲料的生产和供给情况对畜牧业发展起到关键作用。我国饲草资源可分为天然草地和栽培饲草两大类。天然草地由于不合理利用,野生羊草草地出现盐碱化,草地面积逐年减少,生态环境的恶化,严重影响畜牧业的发展。为解决这一问题,吉生羊草的育种工作者对野生羊草进行了物种分化的研究,经过轮回选育,育成了“吉生一、二、三、四号”四个羊草新品种,目前已在生产上大面积推广应用。本试验通过对吉生羊草与野生羊草进行饲喂奶牛的对比研究,为利用吉生羊草提高奶牛的产奶量提供科学依据。1羊草饲喂奶牛试验1.1材… 相似文献
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为解决松嫩平原羊草草原退化、草地改良过程中羊草品种匮乏的问题,自1996年起,黑龙江省农业科学院畜牧兽医分院牧草育种课题组从黑龙江省西部龙江县、肇东市、肇源县、杜尔伯特蒙古族自治县天然羊草草原优势建群种中采集种子,以干草和种子产量高、生长整齐一致、营养丰富为选育目标,采用多次混合单株选择的方法选优去劣,历经18年育成了龙牧1号羊草(Leymus chinensis Longmu No.1)新品系,并以国审品种东北羊草和吉生1号羊草为对照开展了品种比较试验,2015年进入国家草品种区域试验网。结果表明:龙牧1号羊草平均干草产量为8 799. 20 kg/hm2,较对照品种东北羊草和吉生1号羊草增产15. 73%和31. 41%,且达显著水平(P 0. 05);平均种子产量为206. 17 kg/hm2,较对照东北羊草和吉生1号羊草增产16. 31%和42. 96%;抽穗期粗蛋白含量达到13. 34%。说明龙牧1号具有较强的适应性,抗寒、耐盐碱、产草量高,是适合东北寒区人工草地建植、退化草原改良治理的优质牧草。 相似文献
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北方寒地引种抗寒苜蓿品种试验 总被引：1，自引：0，他引：1
１９９１、１９９２年两年对１０个抗寒苜蓿品种进行了品种比较试验，鉴选出公农一号、草原一号、草原二号、甘农一号、图牧二号６个苜蓿良种。这些品种适应黑龙江垦区的生态条件，抗寒、抗病性强、长势好、产草量高、品质优良，可以在垦区三江平原推广种植。 相似文献
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为了选择出适宜于宁夏盐池县干旱风沙区种植的粮饲兼用型玉米品种,试验选用"辽原1号原种""科多四号""中原单32号""辽原一号三代"4个品种与当地种植的"中单2号"进行比较试验。试验结果表明,"辽原一号原种""中原单32号"属抗病力强、高抗倒伏、耐寒、耐旱型品种,是适宜在该地区推广的最优品种。 相似文献
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为了探究羊草种子快速萌发的方法,从而为羊草人工草地的建植提供科学依据,试验以吉农一号、吉农二号、吉生一号、白城野生4份羊草种子为研究对象,观察其在不同预处理方式(浓硫酸浸种、不同温度、预冷处理)下的萌发特性。结果表明:不同品种羊草种子的萌发对不同预处理方式的响应是不同的,浓硫酸浸种能不同程度地提高羊草种子的发芽率、发芽指数和发芽势,且处理15 min的发芽率最高;4个羊草品种在15～35℃的温度范围内均能发芽,最适宜的温度为25℃;4℃预冷处理7,14,21 d羊草种子的发芽率、发芽指数和发芽势均显著高于对照组,其中预冷处理7 d最高。说明羊草种子在经过4℃预冷处理7 d后再用浓硫酸处理15 min,在25℃条件下种子发芽效果最佳;4个羊草品种中,吉农一号各处理的发芽指标均显著高于其他品种。 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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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