今后粮食生产的重点是增加饲料粮——以陕西省农牧业发展为例的探讨

预计到本世纪末,由于人口和粮食几乎是同步增长,按人平均占有的饲料粮恐难于有很大提高,今后粮食生产的发展除保证人口增长所需的口粮外,主要是努力增加饲料粮生产。尽快改变粮、饲不分的传统习惯,因地制宜改革种植业结构,发展能蛋比适宜的优质饲料作物生产,提高饲料转化效率,是发展动物性食物生产,改善人民食物构成的关键所在。对陕西来说,汉中水田区在越冬作物中发展饲料大麦;关中平原灌区推行玉米间作大豆;渭北旱原适当发展苜蓿,实行草粮轮作,均是强化农牧结合的有效途径。     

牛传染性鼻气管炎的分离鉴定和灭活条件的优化

从疑似牛传染性鼻气管炎病毒感染的牛鼻腔中分离出1株病毒,通过PCR方法和MDBK细胞病变观察对其进行鉴定,确定该分离株为牛传染性鼻气管炎毒株。通过对该毒株的增殖条件和甲醛灭活条件的优化研究,为制备牛传染性鼻气管炎细胞源灭活疫苗提供参考依据。结果表明该毒株接毒18h后病变细胞达70％开始收毒,病毒液在0．2％的甲醛37℃灭活36h灭活效果最好。     

X65管线钢焊接接头抗H2S应力腐蚀开裂性能

中海石油(中国)有限公司天津分公司在渤海湾某油田开展了天然气利用项目,天然气外输海管选用国产X65管线钢手工电弧焊接敷设完成.随着油田不断深入开发,伴生天然气中H2S含量持续增长,该海底管道特别是焊接接头等薄弱部位在运行过程中面临着H2S应力腐蚀开裂风险.根据NACE相关标准方法研究了X65管线钢焊接接头抗HB/HIC/SSCC性能,并对SSCC发生机制进行了探讨.研究结果表明:该天然气外输管道所选的国产X65钢焊接接头具有优良的抗H2S应力腐蚀性能,在管道敷设达标及目前运行工况条件下发生硫化物应力腐蚀开裂的风险较小.     

红麻光合特性和干物质生产的品种间差异的初步研究 Ⅱ.叶面积和比叶重

在盆栽或大田无株间相互荫蔽条件下测定30个红麻品种的单株叶面积(LA)和单株比叶重(SLW).结果表明,品种间LA差异极显著,而SLW差异不显著;不同生长季节间、苗期与生长中期之间的LA和SLW都呈显著正相关.据此,可以认为LA和SLW都是相对稳定的品种特性,可考虑用作选择较高光合能力品种(品系)的指标.此外,目前种植面积较大的品种青皮3号和722的LA均接近于所测品种的平均值,因而有可能找出LA比青皮3号和722较高的品种(品系).     

德州驴GDF10基因多态鉴定及其与生长性状的关联分析

[目的]研究将生长/分化因子-10(GDF10)作为候选基因,探讨其多态与不同性别的德州驴生长性状之间的关系.[方法]通过对440头德州驴进行多态检测,鉴定得到3个SNPs位点,并对SNP位点进行分型.利用SPSS 18.0软件分析3个SNPs位点的不同基因型与德州驴9个生长性状的关联分析.[结果]结果显示,3个位点均...     

犬瘟热的综合疗法与体会

犬瘟热是由副粘病毒科的犬瘟热病毒所引起的一种犬科动物的烈性传染病。其特点是传播速度快,流行范围广,死亡率高。另     

Risk factors associated with fecal Salmonella shedding among hospitalized horses with signs of gastrointestinal tract disease

OBJECTIVE: To estimate prevalence of and identify risk factors for fecal Salmonella shedding among hospitalized horses with signs of gastrointestinal tract disease. DESIGN: Cross-sectional study. ANIMALS: 465 hospitalized horses with gastrointestinal tract disease. PROCEDURE: Horses were classified as positive or negative for fecal Salmonella shedding during hospitalization by means of standard aerobic bacteriologic methods. The relationship between investigated exposure factors and fecal Salmonella shedding was examined by means of logistic regression. RESULTS: The overall prevalence of fecal Salmonella shedding was 13%. Salmonella serotype Newport was the most commonly isolated serotype (12/60 [20%]), followed by Anatum (8/60 [13%]), Java (13%), and Saint-paul (13%). Foals with gastrointestinal tract disease were 3.27 times as likely to be shedding Salmonella organisms as were adult horses with gastrointestinal tract disease. Adult horses that had been treated with antimicrobial drugs prior to hospitalization were 3.09 times as likely to be shedding Salmonella organisms as were adult horses that had not been treated with antimicrobial drugs prior to hospitalization. Adult horses that underwent abdominal surgery were 2.09 times as likely to be shedding Salmonella organisms as were adult horses that did not undergo abdominal surgery. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that a history of exposure to antimicrobial drugs prior to hospitalization and abdominal surgery during hospitalization were associated with Salmonella shedding in adult horses with gastrointestinal tract disease. Foals with gastrointestinal tract disease were more likely to shed Salmonella organisms than were adult horses with gastrointestinal tract disease.     

急性髓系白血病患者原发性mdr1基因产物P-170与CD34表达及预后的关系

观察急性髓系白血病患者原发性ｍｄｒ１基因产物Ｐ－１７０与ＣＤ３４抗原表达与预后的关系。方法。常规分离３１例急性髓系白血病细胞,然后分别进行细胞免疫化学检查,观察了细胞膜分化抗原变化和ｍｄｒ１基因产物Ｐ－１７０反应。结论：Ｐ－１７０和ＣＤ３４表达是急性髓系白血病患者对化疗抵抗的标志。     

甘蓝型油菜低芥酸自交不亲和系1010－1，1010－2的选育和利用

从高芥酸自交不亲和系１０１０中系统选育出低芥酸自交不亲和系１０１Ｏ－１和１０１０－２，其配合力均高于亲本系１０１０。利用这两个系作母本同低芥酸品系或品种杂交具有较高而普遍的超亲优势率和对照优势率，优势杂交组合１０１－１×７９Ｃ－３０在两年多点试验中，在几个试点产量超过对照１５％以上，最高超过５４．８４％。     

玉米杂交种'晋单54'的选育及应用研究

‘晋单54'是山西省农业科学院玉米研究所以自选系T14-3B为母本,自选系X19-1为父本,于2002年选育而成.在2004年山西省预备试验中,以11685.0 kg/h㎡的单产水平排第2位,比对照品种‘农大108'增产17.9%.2005-2006年在山西省的2年区域试验中,平均产量为10084.5 kg/h㎡,比对照品种‘农大108'增产9.7%,位于参试品种的第66.在2006年的玉米中晚熟组生产试验中,平均产量为10833.0 kg/h㎡,比对照品种‘农大108'增产10.9%,位于参试品种的第76.该品种高产、优质、多抗,淀粉含量73.63%,属于高淀粉品种.自然条件下高抗玉米大、小斑病和茎腐病,高抗丝黑穗病,高抗玉米螟,适应性广、综合农艺性状优良,平均产量可达10867.5 kg/h㎡,开发应用前景乐观.