了解环境控制猪舍,获取最佳生产性能解析.pptVIP

Basic Environmental Factors Their Effects on Pigs基本环境因素及其对猪的影响 Pigs are VERY adaptable to their environment猪非常能够适应于其所处的环境 Swine Physiological Reponses to Environmental Stressors猪对环境应激因子的生理学反应 Effect of air temp on rectal temp, respiration rate, pulse rate of growing pigs气温对生长猪直肠温度、呼吸率、脉搏的影响 Effect of temperature on caloric intake, feed/gain, daily gain, 155 lb pigs温度对体重155磅猪能量摄入、耗料/增重、平均日增重的影响 LCT, UCT, TNZ 低临界温度、高临界温度、温度适中区 Lower Critical Temperature (LCT)低临界温度 Consume more feed 采食量增加 Apply extraordinary measures to keep warm 加强保暖 Upper Critical Temperature (UCT) 高临界温度 Suppress feed intake 采食量减少 Apply extraordinary measures to stay cool 加强降温 Thermal Neutral Zone (TNZ)温度适中区 EET that optimizes production efficiency使生产率达到最佳的有效环境温度 Thermal Neutral Zone, Upper Lower Critical Temperatures温度适中区、高临界温度、低临界温度 Target Temperature Ranges for Growing and Adult Pigs生长和育肥猪的适宜环境温度范围 Grow-Fin vs. Breeding Herd生长肥育猪 和 繁殖猪 Response to heat by grow-fin is immediate 生长肥育猪对炎热的反应是立竿见影的 Response to heat by breeding herd may be delayed 繁殖猪群对炎热的反应表现较迟 Heat Stress and the Breeding Herd热应激和繁殖猪群 Thermal Environment of the Pig猪的温度环境 Air temperature seldom temperature pig feels 气温很少是猪实际感觉到的温度 Air speed 风速 Humidity 湿度 Group size 猪群大小 Building materials, design, insulation 建筑材料、设计和隔热 Effective Environmental Temperature (EET)有效环境温度 What pig really feels 是猪实际感觉到的温度 Combined influence of many factors 是许多因素共同作用的结果 Exchange with the Environment同环境之间的热交换 Conduction 传导 Transfer of heat by physical contact with another surface同其它表面物理接触而发生的热转移 10-15% of heat loss 占总散热量的10～15% Main components 主要影响因素： Core-to-floor temp difference躯体与地面之间的温差 Conductivity of floor 地板的传导率 Concrete vs. plastic vs. aluminum 水泥、塑料、铝 Contact area between pig floor 猪体和地面的接触面积 Effect of Flooring on Growing Pigs 地面材料对生长猪的影响 Convection 对流 Transfer of heat by physical contact with fluid (air, mud, or water) that is at a different temperature than that of the pig 通过与猪体不同温度的流体(空气、泥浆或