7个杂交黑麦草品种在云南不同气候带的产量比较试验

通过对7个杂交黑麦草品种在云南4个不同气候带的相对干物质产量以及各气候带杂交黑麦草与其亲本一年生黑麦草和多年生黑麦草各品种的平均产量比较分析,结果表明,杂交黑麦草的干物质产量介于其亲本之间,在云南及相似地区推广种植的优良杂交黑麦草品种为奥格斯塔杂交黑麦草。     

不同气候带的多年生黑麦草品比试验研究

分析了10个多年生黑麦草品种在云南4个不同气候带的相对干物质产量,结合品种的营养成分和生长的绿色天数,确定在云南及相似地区推广种植的优良多年生黑麦草品种为草地妞.     

十三个多花黑麦草品种在云南不同气候带的产量比较试验

分析了13个多花黑麦草品种在云南4个不同气候带3年的相对干物质产量,结果为:平均相对干物质产量最高的品种为赫达奇埃巴多花黑麦草4.30t/hm2,其次为特蒂勒多花黑麦草4.04t/hm2,第三为埃克思尔特多花黑麦草3.95t/hm2;最差的品种为艾斯多花黑麦草1.26t/hm2。说明相同牧草种的不同品种之间产量差异较大,在生产实践中,应注意选用优良的牧草品种。     

不同气候带的白三叶品比试验研究

在云南四个不同气候带条件下,分别对国外引进的15个白三叶品种的相对干物质产量进行比较,同时,观测各品种的物候发育和营养成分。结果表明,在云南北亚热带至寒温带气候区域,最优良的品种为海法白三叶,其次为草地胡依阿白三叶和南迪诺白三叶。本文旨在为云南及相似气候环境草地建植中白三叶的品种选用提供参考。     

不同气候带的白三叶品比试验研究

在云南四个不同气候带条件下,分别对国外引进的15个白三叶品种的相对干物质产量进行比较,同时,观测各品种的物候发育和营养成分.结果表明,在云南北亚热带至寒温带气候区域,最优良的品种为海法白三叶,其次为草地胡依阿白三叶和南迪诺白三叶.本文旨在为云南及相似气候环境草地建植中白三叶的品种选用提供参考.     

十五个鸭茅品种在云南不同气候带的品比试验研究

通过对15个鸭茅品种在云南不同气候带的试验研究,以平均相对干物质产量指标为主,同时以物候发育、种子产量和营养成分为辅,确定最适宜云南中亚热带、北亚热带、暖温带、中温带和寒温带大面积推广种植的鸭茅品种为波特(Porto).     

滇东南岩溶山地生态牧草品种种植筛选试验

选择14个生态牧草品种在滇东南岩溶山地进行种植筛选试验,从牧草的建植速度、干物质产量和适口性等方面进行了3年的观测。结果表明:纳罗克非洲狗尾草、弯叶画眉草、劲能多花黑麦草建植速度较快,各供试品种间干物质产量差异较大。弯叶画眉草3年干物质产量平均3 684kg/hm2,显著高于其他供试品种(P<0.05);纳罗克非洲狗尾草和劲能多花黑麦草的产量也较高,分别达2 691 kg/hm2和2 048 kg/hm2。综合各供试牧草的建植速度、适应性及干物质产量等因素,在滇东南北亚热带岩溶山地条件下,放牧草地应选用纳罗克非洲狗尾草、牧友鸭茅、海法白三叶等作为草地改良的建群种,搭配劲能多花黑麦草、保利杂交黑麦草、罗亚红三叶等前期生长快的草种作为先锋草种;生态保护应选择弯叶画眉草、纳罗克非洲狗尾草、云南知风草、牧友鸭茅、热浪苇状羊茅和海法白三叶等草种作为生态改良草种。     

十五个鸭茅品种在云南不同气候带的品比试验研究

通过对15个鸭茅品种在云南不同气候带的试验研究,以平均相对干物质产量指标为主,同时以物候发育、种子产量和营养成分为辅,确定最适宜云南中亚热带、北亚热带、暖温带、中温带和寒温带大面积推广种植的鸭茅品种为波特(Porto)。     

广元市多花黑麦草品比试验

对8个多花黑麦草品种从生育期、产草量、茎叶比等方面进行了比较研究，结果表明：特高多花黑麦草l产量最高，其干物质产量为19397kg／hm^2；蓝天堂产量次之，其干物质产量为18242kg/hm^2；特优多花黑麦草产量最低，其干物质产量为14770kg/hm^2。从总体上来看，各个品种之间产量有一定的差异，但是产量差异不显著。     

多花黑麦草×苇状羊茅属间杂交后代生长特性及品质的研究

试验对黑麦草×苇状羊茅属间杂交后进行比较试验，结果表明，偏羊茅型的杂交后代Ｆ２－４Ｓ－８，偏黑麦草型的杂交后Ｆ２－２－１株高，干物质产量，粗蛋白产量均高于亲本苇状羊茅（Ｋｅｎｔｕｃｋｙ３１，简称Ｋｙ３１）中性洗涤纤维及酸性涤纤维含量均低于苇状羊茅（Ｋｙ３１）。     

商会自治的基石——商会自治规范研究

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。     

癸氧喹酯干混悬剂含量测定的改进

采用高效液相色谱法测定癸氧喹酯干混悬剂的含量,在2-250μg/mL范围内,峰面积的常用对数与进样量浓度的常用对数呈良好的线性关系,R^2=1(n=5),平均回收率为99.24%~99.51%,RSD在0.05%~0.28%。此方法分析时间短,样品前处理简便、定量结果准确,重现性好,结果满意,为其质量控制提供了依据。     

猪毛色遗传的研究进展

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。     

Comparison of 2 methods of centesis of the bursa of the biceps brachii tendon of horses

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.     

不同样本商品蜂蜜中硒含量的测定

用硝酸和高氯酸消化蜂蜜,使硒游离出来,在微酸性环境下,硒和2,3-二氨基萘(DAN)生成有较强荧光的物质,用环己烷萃取,在激发波长378nm,荧光波长518nm处测定其荧光强度。蜂蜜中硒含量范围:0.10～0.82μg/g。表明:蜂蜜应视为天然富硒营养品。     

乳酸杆菌益生作用机制的研究进展

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。     

中华人民共和国农业部公告 第267号

为贯彻落实《兽药生产质量管理规范》(简称《兽药GMP》),进一步推动兽药GMP实施进程,我部制定了《兽药生产质量管理规范检查验收办法》,现予公告。本公告自2003年6月1日起施行。附件:兽药生产质量管理规范检查验收办法二○○三年四月十日第一章 总则 第一条 为推动《兽药生产质量管理规范》(以下简称兽药GMP)的实施,规范兽药GMP检查验收工作,制定本办法。 第二条 农业部负责全国兽药GMP管理和检查验收工作;负责制修订兽药GMP检查验收管理规定;负责兽药GMP检查员队伍建设和监督管理工作,负责国际兽药贸易中GMP互认工作。 …     

鸡败血支原体垂直传播模式及其阻断方法

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。     

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.