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   

Phenological and physiological evaluation of first and second cropping periods of sorghum and maize crops     

Maria Antonia Machado Barbosa  Kacilda Naomi Kuki  Pedro Santos Peno Bengala  Emilly dos Santos Pereira  Angélica Fátima de Barros  Sebastián Giraldo Montoya  Leonardo Duarte Pimentel 《Journal of Agronomy and Crop Science》2020,206(2):263-276

Environmental conditions influence phenology and physiological processes of plants. It is common for maize and sorghum to be sown at two different periods: the first cropping (spring/summer) and the second cropping (autumn/winter). The phenological cycle of these crops varies greatly according to the planting season, and it is necessary to characterize the growth and development to facilitate the selection of the species best adapted to the environment. The aim of this study was to characterize phenological phases and physiological parameters in sorghum and maize plants as a function of environmental conditions from the first cropping and second cropping periods. Two parallel experiments were conducted with both crops. The phenological characterization was based on growth analyses (plant height, leaf area and photoassimilate partitioning) and gas exchange evaluations (net assimilation rate, stomatal conductance, transpiration and water-use efficiency). It was found that the vegetative stage (VS) for sorghum and maize plants was 7 and 21 days, respectively, longer when cultivated during the second cropping. In the first cropping, the plants were taller than in the second cropping, regardless of the crop. The stomatal conductance of sorghum plants fluctuated in the second cropping during the development period, while maize plants showed decreasing linear behaviour. Water-use efficiency in sorghum plants was higher during the second cropping compared with the first cropping. In maize plants, in the second cropping, the water-use efficiency showed a slight variation in relation to the first cropping. It was concluded that the environmental conditions as degree-days, temperature, photoperiod and pluvial precipitation influence the phenology and physiology of both crops during the first and the second cropping periods, specifically cycle duration, plant height, leaf area, net assimilation rate, stomatal conductance and water-use efficiency, indicating that both crops respond differentially to environmental changes during the growing season.  相似文献   

基于卷积神经网络的拖拉机工况识别     

孔庆好  吐尔逊·买买提  赵梦佳 《中国农机化学报》2021,42(11):144

农机工况识别在细化农机作业状态和帮助掌握区域污染物排放趋势方面有着重要的研究价值。基于拖拉机不同运行状态下的行驶速度、发动机转速以及实时油耗等时间序列,首次提出将图像识别方法引入到拖拉机工况识别中的思路,并分别应用参数优化的支持向量机与卷积神经网络对实际作业拖拉机工况进行研究。结果表明:(1)基于参数优化的支持向量机可以较好地实现样本点的工况识别且识别准确度达到99.851 9%,但无法实现农机工况的连续性识别,同时无法对农机工况转换阶段进行有效识别。(2)以拖拉机运行速度与发动机转速等信息构建样本图像来描述农机工况变化的数据表达,并在此基础上应用卷积神经网络可以有效实现农机工况的连续性识别,且识别准确率可以达到93.3%。本研究在农机工况识别方面具有一定参考价值,并为后续农机不同工况下区域污染物排放研究提供技术支持。  相似文献   

玛沁县畜牧业现状及可持续发展对策   总被引：1，自引：0，他引：1  

周明秀 《青海草业》2004,13(3):54-56

通过对玛沁县畜牧业发展现状的分析，总结多年来的经验，提出了畜牧业可持续发展的策略。  相似文献   

阔叶树种的研究现状与江西研究的发展方向   总被引：3，自引：2，他引：1  

黎建军  冯绍龙  刘鲁平  史小刚  罗坤水  李闪金 《江西林业科技》2001,(4):35-38

通过对阔叶树种在我国及江西省的研究状况的论述，初步总结了阔叶树种的研究水平及研究方向，指出了江西省阔叶树种研究存在的问题，探讨了江西省今后阔叶树种研究的方向。  相似文献   

东北地区外来针叶树种引种现状及发展策略   总被引：2，自引：0，他引：2  

陆志民  章林  赵瑛  窦万军  于洪民  王琦  金日录  金点仙 《东北林业大学学报》2004,32(5):23-25

介绍了东北林区主要针叶树种引种现状及取得的成就，分析了东北三省针叶树种引种工作中存在的问题，提出了建立较为科学的引种网络体系和发展策略，并提供了可能在干旱、半干旱区引种成功的针叶树种名  相似文献   

齐卡商品肉兔在不同饲养条件下的育肥效果   总被引：1，自引：0，他引：1  

刘曼丽  唐良美 《中国养兔杂志》1994,(2):17-22

作者在不同条件下，采用全窝育肥法，重复两年、两个季节测定了齐卡商品肉兔的育肥效果；探讨了温度、季节、营养水平、育肥始重对育肥效果的影响。结果表明：在试验场育肥２５０只齐卡商品兔，９０日龄育肥重２．３３～２．５３公斤，日均增重３１克以上，耗料指数３．３１：１，育肥成活率９５％以上，屠宰率５２％，净肉率８０％，肉骨比５．３５：１，兔肉品质正常。在农村条件下育肥１８０只，９０～１００日龄育肥重２．２～２．４公斤，耗精料指数２．５５：１，育肥成活率８８％～９３％。饲养齐卡商品兔与饲养二元杂交兔相比，每只可增加经济收入２０％以上。育肥季节和始重明显影响育肥未重（Ｐ＜０．０５）。依据本试验，作者建议齐卡商品兔适宜３５日龄断奶，育肥始重应不低于６００克；寒冷季节育肥，育肥第一月的室温应不低于１０℃。育肥适宜营养水平建议消化能（ＤＥ）２６００～２７００大卡／公斤，粗蛋白（ＣＰ）１８％，粗纤维（ＣＦ）１２％以上。  相似文献   

环境温度和饲粮营养浓度对生长期母兔代谢能利用率的影响     

金岭梅  D.J.Farrell  E.Thomson 《动物营养学报》1989,(1)

选用6只9周龄新西兰母兔,评定环境温度和饲粮营养浓度对生长期母兔代谢能利用率的影响。试验在密闭式的小动物呼吸测热柜中进行。分别对处于环境温度为20±2℃和30±2℃,采食两种不同营养浓度的试兔进行测试。饲粮营养水平实测值,分别为12.22kJ ME/g和13.49kJ ME/g;粗蛋白质(CP)分别为17.3％和21.6％;中性洗涤纤维(NDF)分别为23.7％和16.5％。结果表明:环境温度影响试兔的能量平衡,它与采食量间存在着显著的相关。20±2℃时,相关系数r=0.798;30±2℃时,相关系数r=0.875。在本试验设计范围内,饲粮营养浓度并不影响代谢能食入量(ME_I),热增耗(HP)和能量平衡(EB)。当环境温度为20±2℃和30±2℃时,表观代谢能转化率(NE/ME)分别为51％和71％;每天每兔每千克代谢体重代谢能维持需要分别为396 kJ和361 kJ。试验结果认为:环境温度影响营养物质消化率(P相似文献   

Growth of triploid oyster, Crassostrea madrasensis (Preston)   总被引：1，自引：0，他引：1  

Jyothi V Mallia  Palaniyappan Muthiah  & Palahani C Thomas 《Aquaculture Research》2006,37(7):718-724

The performance of I and II meiotic triploids and control oysters (Crassostrea madrasensis) reared at Tuticorin Bay was compared to determine if the improvements in the growth of edible oysters were additive to faster growth in triploids. After a grow‐out period of 12 months, both mean whole weights and shell heights were in order I meiotic triploid>II meiotic triploid>control. Mean whole weights and shell height of different oyster lines were all significantly different (P<0.05). On an average, larger morphological traits indicated that growth improvements from triploids were additive, and throughout the study triploid oysters maintained faster growth rate than their diploid siblings. Condition index and adductor muscle diameter of both triploids were higher than those of control.  相似文献   

一类空间分解问题     

张桂 《湖南农业大学学报(自然科学版)》1996,23(5)

讨论了一类与区域分解算法有关的空间分解问题，将二阶问题的已有的空间分解结果推广到四阶问题的相应空间中。还证明了一致重迭性条件与Ｂａｄｅａ条件的等价性。  相似文献