【摘要】 研究了青年蛋鸡的耐热力与其在高温下的体温（BT）、体温变化幅度（△BT）、热致死体温（LBT）及体重（BW）之间的关系。结果表明，以热应激存活时间（HSST）的长短为指标的耐热力，与鸡在38℃和40℃下的BT及△BT呈极显著负相关（在38℃下相关系数r分别为-0．49和-0．47，在40℃下r分别为-0．76和-0．77），与轻度热应激（32和35℃）下的BT，△BT，LBT和BW相关均不显著。在高温（32，35，38，40℃）下，耐热鸡群的BT和△BT均比不耐热鸡群低，但只有在38℃下两指标才达显著水平（P＜0．05），40℃下则均达极显著水平（P＜0．01）。更多还原

【Abstract】 The relationships of heat tolerance with body temperature (BT),change of body temperature (△BT) and lethal body temperature (LBT) were studied with 31 Hisex layers (20 weeks ) in environmental controlled chamber. It was showed that heat stress survival time (HSST) is significant related negatively to layers’ BT and △BT at acute heat stress (at 38℃, r=-0. 49 and -0. 47 respectively; at 40℃, r=-0.76 and - 0. 77 respectively),While at general high temperature (32℃ and 35℃ ),the relationships of HSST with BT,△BT and LBT are unsignificant (P>0.05). Higher heat-tolerant layers’ BT and △BT are lower than those of the lower heat-tolerant layers’ in high temperature (32, 35, 38, 4O℃ ), but the results show significant difference only appeared under acute high temperature (at 38℃,the two group’s BT is 44. 31, 44. 04℃ respectively, △BT is 2. 61, 3. 39℃;at 40℃, BT is 43. 36,44. 85℃,△BT is 2. 64, 4. 32℃ ). The value of BT and △BT is always lower for heat-tolerant layers. However,only at the point above 38℃, the difference reach a statistical significant level (P<0. 05, and when 40℃ P<0.01).更多还原