不同处理对吉塞拉系樱桃砧木扦插效果的影响

为建立高效樱桃优良砧木‘吉塞拉5号’和‘吉塞拉6号’嫩枝扦插体系,系统研究激素、生长点(不同部位)、插穗时间及叶片数量对‘吉塞拉5号’和‘吉塞拉6号’扦插生根率及扦插幼苗长势的影响。结果表明,利用12~15cm半木质化嫩枝扦插‘吉塞拉5号’和‘吉塞拉6号’时,最佳扦插方案是:5月下旬进行扦插,插穗顶部带4片展叶,采用500mg·L~(-1) IBA浸泡3min,可使‘吉塞拉5号’和‘吉塞拉6号’的生根率分别达到90%和80%以上。对于‘吉塞拉6号’来说,不带生长点半木质化的中段嫩枝扦插生根率更高,扦插苗长势更好。激素、插穗取材部位和时间及叶片数量对吉塞拉甜樱桃的扦插效果有显著影响。     

不同季节不同生产因素对荷斯坦奶牛性控冻精人工输精受胎率的影响

为研究不同季节、不同胎次、不同发情方式及不同泌乳天数等因素对奶牛单个情期受胎率的影响,选取2169头奶牛进行统计分析。结果显示,奶牛秋冬季配种受胎率较春夏季高,冬季情期受胎率显著高于春、夏两季（P＜0.05）,初产奶牛情期受胎率高于经产奶牛（P＜0.01）,自然发情情期受胎率极显著高于同期发情药物处理奶牛（P＜0.01）,不同泌乳阶段对受胎率影响不大（P＞0.05）。     

生长猪低蛋白质日粮可消化赖氨酸、蛋氨酸+胱氨酸、苏氨酸、色氨酸平衡模式的研究

试验通过研究低蛋白质饲粮中可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平对生长猪生产性能和尿素氮的影响,以建立生长猪日增重和料重比对日粮可消化氨基酸的回归模型.选取体重30 kg的三元(杜×长×大)杂交生长猪68头,随机分为17个处理,每个处理4头猪,运用4因素5水平二次回归正交组合设计(1/2实施),研究得出日增重和料重比对日粮可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平的回归方程.生长猪日增重(Y1,g)对日粮可消化赖氨酸(X1,%)、蛋氨酸 胱氨酸(X2,%)、苏氨酸(X2,%)和色氨酸(X4,%)水平的回归方程为:Y1=-5.568 0 7.587 8X1 3.045 2X2 9.183 5X3 4.226 9X4 5.200 4X1 X2-1.905 6X1X3 2.233 4X1X4-6.005X12-7.3694X22-7.5432X32-22.073242=(R2:0.964 0,P<0.05);生长猪料重比(Y2,g)对日粮可消化赖氨酸(X1,%)、蛋氨酸 胱氨酸(X2,%)、苏氨酸(X3,%)和色氨酸(X4,%)水平的回归方程为:Y2=12.176 0-9.843 6X1-19.043 2X2-2.486 7X3-11.733 0X4-1.875 0X1 X2-6.875 0X1 X3 1.562 5X1X4 8.986 6X12 23.274 5X22 7.968 4X32 33.470 5X42(R2=0.921 3,P<0.01);日增重达到最大值(0.775 kg)时,日粮的可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平分别为0.78%、0.48%、0.51%和0.14%.相应的氨基酸比例为Lys:(Met Cys):Thr:Trp=100:61:64:18.料重比最小(2.69)时,对应的日粮可消化赖氨酸、蛋氨酸 胱氨酸、苏氨酸和色氨酸水平分别为0.77%、0.44%、0.49%和0.16%.氨基酸比例为Lys:(Met Cys):Thr:Trp=100:57:64:21.对日增重和料重比进行综合考虑,获得最佳生产性能的可消化氨基酸的比例范围为Lys:(Met Cys):Thr:Trp=100:(57～61):64:(18～21).     

治疗剂量环丙沙星对育成猪免疫功能影响研究

为研究环丙沙星对免疫功能的影响 ,取 7周龄 ,体重 (2 5 5± 1 4 )kg ,长大杂交猪 12头 ,随机均分为试验组和对照组。试验组按每千克体重 5mg由耳静脉推注乳酸环丙沙星 ,每天 2次 ,连续 8d。施药第 0、7、14、2 1天 ,自前腔静脉采血 ,用显微镜法计数白细胞总数 ,姬姆萨染色法作白细胞分类计数 ,硝基蓝四氮唑 (NBT)还原试验定量检测嗜中性白细胞吞噬功能 ,噻唑蓝 (MTT)比色法检测外周血中淋巴细胞转化 ,单向免疫扩散法测定血清IgG浓度 ,5 0 %溶血试验测定血清中补体总活性 ,同时 ,用植物血凝素 (PHA)皮肤试验检测迟发型超敏 (DTH)反应。结果表明 ,环丙沙星对白细胞总数无影响 ,第 14天 ,试验组嗜中性白细胞百分含量显著低于对照组 (P <0 0 5 ) ,而淋巴细胞百分含量极显著升高 (P <0 0 1)。给药后 ,嗜中性白细胞还原硝基蓝四氮唑 (NBT)能力极显著升高 (P <0 0 1) ;植物血凝素 (PHA)刺激猪淋巴细胞体外增殖能力 ,第 7、14天极显著升高 (P <0 0 1) ,第 2 1天显著高于对照组 (P <0 0 5 ) ,PHA刺激迟发型皮肤超敏反应 (DTH)给药后第 7天极显著高于对照组 (P <0 0 1) ,而第 14、2 1天又显著低于对照组 (分别为P <0 0 5 ,P <0 0 1) ;给药后第 14天 ,血清中IgG的含量显著低于对照组 (P <0 0 5 ) ;第 7     

季节和高温对集约化饲养长白猪繁殖性状的影响

亚热带集约化条件下配种妊娠舍６、７、８、９月份的月平均舍温分别达到了２９．６℃、３０．５℃、３１．２℃、２９．７℃。经产长白猪春夏秋冬各季节的断奶至配种间隔天数分别为５．５１±２．５４、６．３３±２．９６、５．７３±１．９０、６．２３１３．２９，受胎率分别为８６．２１％、９０．６３％、９０．３２％、９４．２９％，窝活产仔头数分别为９．８３±２．２０、９．７６±１．９４、９．８９±１．６６、９．１５±１．９５，方差结果无显著差异。高温组、常温组的断奶至配种间隔天数分别为６．０４±２．９６、５．８９±２．５６，受胎率分别为９１．４３％、９０．２１％，窝产活仔头数分别为９．７５±ｌ．８７、９．５７±１．９８，ｔ检验无显著差异。     

Do seasons matter? Exploring the dynamic link between blue-green space and mental restoration

In the face of the increasing mental health crisis, there is a growing awareness of the benefits of natural environments, especially urban blue-green spaces in promoting mental health. However, most studies neglected the dynamics of blue-green space over the seasons and the dynamic effects on mental restoration. In addition, the access to nature can be quantified from multiple dimensions, but few studies have measured the specific characteristics (such as revetment type, distance from water, and width of field view) of blue-green space as visitors experienced. To fill these gaps, we conducted a field investigation in 18 selected blue-green spaces in winter and summer, examining the dynamic relationship between blue-green space and mental restoration. A total of 915 samples was collected through questionnaires. The results indicated that the impact of blue-green space on mental restoration varies with the seasons, for example, green space significantly promoted physical activity in summer, but not in winter, and blue space inhibited physical activity more significantly in summer. Moreover, the overall results suggested that blue space did not directly promote the improvement of visitors’ mental health, but improved social interaction, while green space had a direct positive influence on mental restoration. This study explored the dynamic link between blue-green space and mental restoration over different seasons, expanding the potential characteristics of blue-green space that affecting visitors’ mental restoration, and contributing to our knowledge of the health benefits of visiting blue-green spaces.     

育成期高能饲喂下开产与未开产蛋鸡肝脏转录组差异分析

对育成期高能饲喂的开产与未开产蛋鸡进行肝脏转录表达谱差异分析,探明在高能饮食状态下肝脏中影响开产的基因,为提高产蛋打下基础.以高能饲粮饲喂育成期蛋鸡为对象,运用高通量测序平台对开产与未开产鸡的肝脏进行转录组测序,使用HTSeq和DESeq等方法分析基因表达量并运用qRT-PCR验证,并以超几何分布对差异表达基因进行GO...     

The impact of vegetation and media on evapotranspiration in bioretention systems

Bioretention systems have known benefits for managing urban stormwater, but there remain knowledge gaps about evapotranspiration (ET) and its role in these systems. This paper investigated how design parameters including growing media and vegetation, as well as climatic variables, can influence ET in bioretention systems. To this end, twenty-four bioretention mesocosms constructed using three media types (i.e., two sandy media types and clay loam mixed with wood chips) and planted with three vegetation types (i.e., herbaceous mixture, woody mixture, and turfgrass as control) in Okotoks, Alberta, Canada were monitored during the growing seasons (from May to October) between 2018 and 2020. The media moisture in the mesocosms was monitored at the depths of 20 and 40 cm to study how the design parameters and their interactions could influence ET. The results confirmed the roles of design and climatic variables on ET, while their effects were more prominent at the surface layer. The sandy media with the low organic matter (SD1) and the woody vegetation appeared to outperform the other media and vegetation types in promoting ET. The findings demonstrated the non-stationary nature of the ET function in the mesocosms. The effects of the design variables, in particular the vegetation, became more prominent over time. In addition, the impact of media-vegetation interactions on ET was identified. The results suggest the need for optimizing bioretention systems with consideration to the design variables, whose roles on ET are time- and depth-variant, to promote ET and, in turn, bioretention performance.