轻微至中度热应激对荷斯坦奶牛生理指标及产奶性能的影响  

The Influence of Heat Stress, from Mild to Medium, on Physiological Index and Milk Yield of Holstein Lactating Cows

作　　者：杨毅[1] 梁荣嵘[1] 刘庆华[1] 梁学武[1] 

机构地区：[1]福建农林大学奶牛研究所,福州350002

出　　处：《中国农学通报》2009年第24期28-31,共4页Chinese Agricultural Science Bulletin

基　　金：国家科技支撑计划(奶业专项)"现代奶业生产技术集成及产业化示范"(2006BAD04A12);福建省科技重大专项"畜禽现代饲养模式关键技术研究与示范"(2006NZ0003-1)

摘　　要：为探索不同程度热应激对中国荷斯坦泌乳牛生理常数指标和产奶性能的影响,此试验随机选用16头中国荷斯坦泌乳牛,研究轻微至中度热应激对其生理指标及产奶性能影响。结果表明:(1)泌乳牛在轻微热应激期(THI74.5±1.0)的生理常数指标与非热应激期(THI65.2±4.1)差异均不显著(P>0.05);中度热应激期(THI84.0±2.4)的各项生理常数指标均显著高于非热应激期(P<0.05)。从非热应激至中度热应激,THI每升高1,直肠温度上升0.04℃;从轻微至中度热应激,THI每升高1,泌乳牛的呼吸频率增加3.4次/min,脉搏增加2.6次/min。(2)在轻微和中度热应激期泌乳牛产奶量分别下降13.8%和26.9%(P<0.01),产奶量与THI呈极显著负相关(P<0.01)(R=-0.82),THI每上升1,产奶量下降1.9%。In order to explore the influence of the difference heat stress on physiological index and milk yield, 16 Chinese Holstein lactating dairy cows were selected randomly to study the influence of heat stress （from mild to medium） on physiological index and milk yield. The result shows that： （1） the physiological index were no significant difference （P〉0.05） between the mild heat stress period （THI 74.5± 1.0） and no heat stress period （THI 65.2±4.1）. The physiological index were significant difference （P〈0.05） between the medium heat stress period （THI 84.0±2.4） and no heat stress period （THI 65.2±4.1）. From mild to medium heat stress period, while THI rise 1, the respiratory rate of dairy cows increase 3.4n/min, rectal temperature increase 0.04℃;（2）During mild and medium heat stress period, the milk yield of dairy cow decrease 13.8% and 26.9% respectively （P〈0.01）, the relationship between milk yield and THI were negative （P〈0.01） （R=-0.82）, whileTHI rise 1, the milk yield of dairy cow decrease by 1.9%.

关 键 词：奶牛 热应激 生理指标 产奶性能 

分 类 号：S813.3[农业科学—畜牧学]