大豆—花菜—莴笋一年三熟高效栽培模式

湖北天门总结了大豆—花菜—莴笋一年三熟高效栽培模式,提高了土地利用率、产出率,改变了单种作物多茬导致的连作障碍,而且增加了农户收入,提高了种植蔬菜的积极性。各蔬菜种植时均应选择合适的品种、合理播种、注重病虫害防治等。     

牛伊氏锥虫病的诊治

对一例牛伊氏锥虫病的发病情况、临床症状、解剖病理变化和实验室检查情况进行了介绍,并提出了相应的治疗和预防措施。     

导叶位置对S型轴伸贯流泵装置水力性能的影响

为了研究不同导叶位置对S型轴伸式贯流泵装置水力性能的影响,设计了4种不同导叶相对位置的方案,并分别针对小流量(Q=0.8Q0)、设计流量(Q=1.0Q0)、大流量(Q=1.2Q0)3种工况下的S型轴伸贯流泵装置进行了数值模拟计算。对比数值模拟结果与试验结果,并分析计算结果的外特性与内特性,通过模型试验验证了数值模拟计算结果的准确性。结果表明,泵装置效率和扬程随导叶相对位置逐渐增大呈现先上升后下降的趋势,导叶与叶轮之间的相对距离存在最优值A=10 mm,在此位置时,泵装置效率和扬程相对最高,导叶体水力损失与出水流道水力损失相对最小,导叶体对于动能的回收能力强。小流量与设计流量工况下,出水流道进口平均涡角的大小随导叶相对位置先减小后增加,对应出水流道水力损失先下降后上升的趋势。大流量工况下,平均涡角不随导叶相对位置变化而变化。     

一起肉雏鸡传染性法氏囊病并发大肠杆菌病的诊治

2010年6月，哈尔滨市方正县会发乡某鸡场发生一起肉雏鸡传染性法氏囊并发大肠杆菌病例。依据流行病学，临床症状，剖检变化及实验室检验综合诊断与防治，现将诊疗过程叙述如下。 1 发病情况2010年6月，哈尔滨市方正县会发乡某养鸡场共同养肉雏鸡3000余只，至发病送检时26日龄。肉雏鸡发生以排白色、浅绿色稀粪，羽毛蓬松、精神萎靡不振，颈部、躯干震颤，步态不稳，头下垂，眼睑闭合、脱水，眼窝凹陷，衰弱死亡为特征的传染性疾病。     

猪圆环病毒病珍断技术的研究进展

猪圆环病毒（PCV）可引起断奶仔猪进行性消瘦、淋巴组织等组织病变的一种多系统衰竭综合征的重要传染病。是目前已知最小的动物病毒，猪圆环病毒有2种不同的血清型，一种为猪圆环病毒I型（PCVl）；另一种为猪圆环病毒ll型（PCV2）。经实验证明，一般认为PCVl血清型无致病性，而PCV2血清型有致病性，并认为它是引起断奶仔猪多系统衰竭综合征的重要病原之一。主要综述猪圆环病毒病的临床诊断、病理学诊断、实验室诊断等，探讨猪圆环病毒病有效的诊断方法，为临床上猪圆环病毒病的确诊提供参考。     

Effects of Lactic Acid Bacteria and Fructooligosaccharides on Growth Performance,Nutrient Digestibility and Serum Biochemical Indices of Arctic Foxes (Alopex lagopus) during Early Growth Period北大核心CSCD

This experiment was conducted to study the effects of dietary lactic acid bacteria (LAB) and fructooligosaccharides (FOS) on growth performance, nutrient digestibility and serum biochemical indices of Arctic foxes (Alopex lagopus) during early growth period. Sixty male post-litter Arctic foxes with the average body weight of (1.16±0.15) kg and at the age of (45±3) days were randomly assigned to 4 groups with 3 replicates per group and 5 foxes per replicate. The foxes were fed the following diets, respectively: basal diet (control group), basal diet+3×109 CFU / kg LAB (LAB group), basal diet+5 g / kg FOS (FOS group) and basal diet+3×109 CFU / kg LAB+5 g / kg FOS (LAB+FOS group). The experiment lasted for 30 days. The results showed as follows: 1) on the days 1 to 15, the diarrhea rate of foxes in the LAB group and LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05). On the days 16 to 30, the average daily gain of foxes in the LAB+FOS group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); the diarrhea rate of foxes in the LAB+FOS group was significantly lower than that in the control group and FOS group (P<0.05), but had no significant difference with LAB group (P>0.05); compared with the FOS group, the feed to gain ratio of foxes in the LAB+FOS group was significantly decreased (P<0.05). 2) The dry matter digestibility of foxes in the LAB + FOS group was significantly higher than that in the control group and FOS group (P < 0.05), but had no significant difference with LAB group (P>0.05). There were no significant differences in nitrogen intake, fecal nitrogen, urine nitrogen, nitrogen deposition, net protein utilization and protein biological value among all groups (P>0.05). 3) Serum total protein (TP) content of foxes in the LAB+FOS group was significantly higher than that in the FOS group (P<0.05), but had no significant difference with control group and LAB group (P>0.05). Serum albumin (ALB) content of foxes in the LAB group was significantly higher than that in the control group and FOS group (P<0.05), but had no significant difference with LAB+ FOS group (P>0.05). Serum urea nitrogen (UN) content of foxes in the LAB+FOS group was significantly decreased compared with the control group (P < 0. 05). In conclusion, the combined supplementation of 3 × 109 CFU / kg LAB and 5 g / kg FOS in the diet is beneficial to reduce diarrhea rate, improve dry matter digestibility, improve body immune level, and promote the growth of Arctic foxes during early growth period. © 2023 Chinese Journal of Urology. All rights reserved.     

犬真菌性皮肤病的诊治

犬真菌性皮肤病是以引起犬的头、颈、四肢、躯干的皮肤上形成鳞屑状癣斑为主要特征的人和多种动物都能感染的共患病.     

浅析柴油机中有关油耗、排放控制技术的几个问题

近年来,随着人们对环境的保护日趋重视。特别是近些年来随着城市的汽车越来越多,我国大部分地区被雾霾天气笼罩。研究表明,雾霾天气形成主要原因之一是汽车尾气的排放。因此现在世界各国对内燃机废气排放的要求及标准也越来越高了。     

多浪羊同期发情、定时输精效果探讨

运用阴道海绵栓＋PMSG法对夏季多浪羊进行同期发情处理,并用萨福克羊颗粒冻精对同期发情羊进行定时输精。结果表明：颗粒冻精输精受胎率24.52%,颗粒冻精干、湿两种解冻法对受胎率没有显著影响。     

兴宁地区水稻三化螟大发生原因浅析及其防控对策

针对兴宁市2013年第四代三化螟大发生的情况,进行了系统调查,剖析其大发生的主要原因,提出了"狠抓一、三代压虫源、重视二、四代保丰收"等防控对策。