Effects of music stimulus on behavior response,cortisol level,and horizontal immunity of growing pigs     

Jiafang Li  Xiang Li  Honggui Liu  Jianhong Li  Qian Han  Chao Wang  Xiangyin Zeng  Yutao Li  Wenbo Ji  Runxiang Zhang  Jun Bao 《Journal of animal science》2021,99(5)

An enriched environment is widely used to improve domestic animals’ welfare and promote their natural behaviors. Music can reduce abnormal behavior in humans, nonhuman primates, and rodents. However, little is known about the effects of music on pigs. This study aims to explore the effects of repeated music stimulation on the behavior, physiology, and immunity of growing pigs. A total of 72 hybrid piglets (Large White × Duroc × Minpig) were randomly divided into three groups, including music (Mozart K.448, 60 to 70 dB), noise (recorded mechanical noise, 80 to 85 dB), and control (natural background sound, <40 dB), and 6 h sound stimulation was given per day (1000 to 1600 hours) from 40 to 100 d of age. The behavioral activities of the pigs were observed during the music stimulation, and their serum cortisol, salivary cortisol, and serum immune indices were also measured. Compared with the control group, the music group and noise group increased activity but decreased lying of pigs (P < 0.05). A significant increase in tail-wagging, playing, and exploring behaviors of pigs was found in the music group (P < 0.05), and the noise significantly increased the aggressive behavior of the pigs (P < 0.05). Tail-wagging, playing, exploring, manipulating, and aggressive behaviors decreased over time. Short-term (8 d) music stimulus had a lower cortisol level than that of the noise and control groups (P < 0.05), whereas long-term (60 d) music stimulus increased immunoglobulin G (IgG), interleukin-2 (IL-2), and interferon-gamma (IFN-γ) levels (P < 0.05) and decreased interleukin-4 (IL-4) level (P < 0.05). Long-term noise stimulus significantly reduced the level of IgG (P < 0.05) but did not affect the level of IL-2, IL-4, and IFN-γ levels (P > 0.05). In conclusion, short-term music stimulus (8 d) reduced the stress response, whereas long-term music stimulus (60 d) enhanced the immune responses. In addition, the noise increased the aggressive behavior, and long-term noise reduced the immunity of the growing pigs.  相似文献   

蜗壳式离心泵外特性仿真与实验研究     

喻德辉  陈燕  王超  白小榜  杨由超 《中国农村水利水电》2020,(1):181-184,187

为探索不同仿真方法的适用性,对ns=157的单级蜗壳离心泵不同工况的扬程和效率进行定常和非定常计算,并分别分析了定常计算时不同叶片夹角及非定常计算时不同时间步长的影响,通过与实验对比,得到的主要结论有:定常计算仅适用于额定工况外特性仿真,其扬程和效率计算误差分别为4.9%和2.9%,而定常多相位的计算误差分别为7.1%和3.2%;非定常仿真计算时,以4°为时间步长,并间隔20°保存一次计算数据,较好地预测出扬程曲线走势,额定工况扬程和效率计算误差约1.1%和1.8%,但小流量和大流量区间扬程计算误差达到10%左右。因此在水力优化设计时,若只关注高效点位置及其扬程和效率,可采用定常计算,若还关注扬程曲线走势,则应采用非定常计算。  相似文献   

抗青枯病花生种质资源的鉴定与筛选     

杨光  李航宇  陈龙  石守设  余明慧 《农学学报》2021,11(12):44-47

为筛选适宜河南省信阳市种植的抗青枯病花生品种,对27份花生品种青枯病田间病圃进行鉴定,计算其发病率和病情指数,从而进行抗病性鉴定和筛选。结果表明,27个供试品种中,中高抗品种共10个占总数的37%,3个品种类型各筛选出2个抗病品种。6个抗病品种发病规律表明,7天和14天病情指数增长较快,21天后基本无变化。高油型花生‘远杂9102’和‘信花425’,高油酸型花生‘信花14号’和‘驻花11号’,普通型花生‘远杂21号’和‘豫花149号’为适宜信阳种植的抗病品种。  相似文献   

栽植密度对不同种源芡实生长的影响     

岳龙  肖凤祥  张永鑫  房文龙  吕迪平  刘明镝  叶雅玲 《防护林科技》2020,(1):18-19,30

对不同栽植密度条件下,不同种源地芡实的生长情况进行了调查研究,结果表明:不同栽植密度间芡实的叶均直径、叶最大直径、果径、果长、果质量、粒数、粒质量均无明显差异,不同栽植密度间产量存在差异;不同种源地间8项物理性状指标均无明显差异;除果长与栽植密度的交互作用对产量无影响外,其余6种性状与栽植密度的交互作用均存在差异,表明交互作用对产量有影响。7种性状与种源地的交互作用下,种源地与产量间的关联不大。  相似文献   

GA4+7+氯吡脲对重瓣百合'Thalita'生长的影响     

黄武略  李洋  罗超  张天谣  黄美娟  黄海泉 《北方园艺》2021,(17):75-80

以重瓣百合'Thalita'为试材,采用4个不同浓度(10、20、40、80 mg·L-1)的GA4+7+氯吡脲(1∶1),对其进行叶面喷施处理,以清水为对照,测定其株高、茎粗、叶面积等指标,探讨GA4+7+氯吡脲对重瓣百合'Thalita'生长的影响,以期为其推广提供参考.结果 表明:20 mg·L-1 GA4+7+氯吡脲对'Thalita'花苞直径和叶面积促进作用最大,分别比对照高14.18％和55.13％,均达显著差异;茎粗随着GA4+7+氯吡脲的浓度升高表现出一定抑制作用;20 mg·L-1GA4+7+氯吡脲在花苞开放率和花期上综合效果最好;80 mg·L-1 GA4+7+氯吡脲对'Thalita'株高促进效果最好,比对照高2.67％;所有处理组种球鲜质量和根长均比对照低,其中20 mg·L-1 GA4+7+氯吡脲效果最为明显,分别比对照低36.77％和48.18％,均达显著差异.综合比较来看,20 mg·L-1 GA4+7+氯吡脲对重瓣百合'Thalita'生长影响最大,效果更佳.  相似文献   

液电混合直线驱动系统位置控制特性研究     

郝云晓  夏连鹏  葛磊  王翔宇  权龙 《农业机械学报》2020,51(3):379-385

提出了一种采用电-机械直线执行器和液压缸的液电混合直线驱动系统。为消除电-机械直线执行器和液压缸之间的耦合影响,液压泵和比例阀协同控制液压缸输出力和运行方向,满足系统负载力需求,电-机械直线执行器用于运动控制,并补偿液压缸输出力波动和外部干扰力。为实现上述目标,设计了基于扩张状态观测器的电-机械直线执行器自适应滑模控制方法,以估计的负载力调节泵压力和比例阀开度,对液压缸输出力进行调控。比例阀在系统运行中主要用于控制液压缸运动方向,阀开度较大,可显著降低节流损失。通过仿真和试验分析了系统的运行特性和能效特性。结果表明,该系统具有良好的位置控制特性,能量效率高,较传统阀控系统能耗减少51%。  相似文献   

危害蒙古栎的新害虫——金纹吉丁     

刘环宇  马银祥  娄超  雒雅婧  唐冠忠 《河北林业科技》2020,(2):40-41

2018年在承德市双庙村蒙古栎林中发现吉丁幼虫危害现象,对其进行鉴定确定为金纹吉丁(Corebus aequalipennis Fairmaire),并对其分布范围、主要形态特征、生物学特性等进行了调查,提出了相应的防治措施。  相似文献   

春大棚基质化栽培辣椒品种比较试验     

王书娟  齐合玉  鲁利平  孙超  陈文钊 《蔬菜》2019,(7):76-80

为了提高甜辣椒规模化、产业化生产的竞争力,进一步提高产量、效益和品质,加快甜辣椒栽培管理技术的推广和应用,特引进7个辣椒新品种并采用基质化栽培管理模式进行对比研究。通过对辣椒生长势、品质和产量的比较分析,结果表明:夏驰、国福908、海迈604表现突出,具有个大、肉厚、口感好、品质优、连续坐果性好等特点,而且产量、效益较高,抗病性强,适合设施基质化栽培生产,有很好的推广价值。  相似文献   

大数据环境下的数字图书馆多元转型策略研究     

李超 《农业图书情报学刊》2018,30(9):100-105

大数据环境的变化,不仅改变了用户的信息行为,也使得数字图书馆服务朝着越加个性化、知识化、多元化的角度不断发展,由此带动了数字图书馆资源特征与服务特征的适应性的变化,促使数字图书馆朝着创新服务模式、融合服务元素、拓展服务功能、知识化建设、精确化服务等角度的转型发展,也包括数字图书馆自身对于服务力量的不断强化和服务展现形式的多元化等方面的转型发展,推动数字图书馆不断改变原有的服务范式而朝着更加个性化、知识化和技术化的角度不断发展。  相似文献   

Comparison of the microbial communities of alpacas and sheep fed diets with three different ratios of corn stalk to concentrate     

Ruimin Chao  Chengqiang Xia  Caixia Pei  Wenjie Huo  Qiang Liu  Chunxiang Zhang  Youshe Ren 《Journal of animal physiology and animal nutrition》2021,105(1):26-34

The objective of this study was to investigate the characteristics of ruminal microbial communities of alpacas (Lama pacos) and sheep (Ovis aries) fed three diets with varying ratios of roughage (corn stalk) to concentrate, 3:7 (LS), 5:5 (MS) and 7:3 (HS). Six alpacas (one-year-old and weighing 29.5 ± 7.1 kg) and six sheep (one-year-old and weighing 27.9 ± 2.7 kg) were used in this study, in a replicated 3 × 3 Latin square experiment. Total protozoa concentration was determined under the microscope; total fungi and methanogens were assessed using quantitative polymerase chain reaction and expressed as a percentage of total bacterial 16S rRNA gene copies; bacterial communities were investigated by targeted 16S rRNA gene (V3–V4 region) sequencing. The percentage of fungi was significantly higher in alpacas than in sheep under the LS diet, while the concentration of protozoa was significantly lower in alpacas under HS, MS and LS diets. The alpha diversity including Shannon, Chao l and ACE indices of bacterial communities was higher in alpacas than in sheep, under the LS diet. A total of 299 genera belonging to 22 phyla were observed in the forestomach of alpaca and sheep, with Bacteroidetes and Firmicutes dominating both animal species. Phyla Armatimonadetes and Fusobacteria, as well as 64 genera, were detected only in alpacas, whereas phyla Acidobacteria and Nitrospira, as well as 44 genera, were found only in sheep. The abundance of cellulolytic bacteria, including Butyrivibrio and Pseudobutyrivibrio, was higher in alpacas than in sheep under all three diets. These differences in the forestomach microbial communities partly explained why alpacas displayed a higher poor-quality roughage digestibility, and a lower methane production. Results also revealed that the adverse effects of high-concentrate diets (70%) were lesser in alpacas than in sheep.  相似文献