Morrison W D, Bate L A, Amyot E, McMillan I
Department of Animal and Poultry Science, University of Guelph, Ontario, Canada.
Poult Sci. 1987 Nov;66(11):1758-61. doi: 10.3382/ps.0661758.
In four trials, 408, 320, 160, and 400 chicks were housed on litter in pens 1.8 x 2.4 m. Eight pens were used for each trial. For the first 6 days the environmental temperature was maintained at 28 C; on Day 7 the temperature was reduced to 16 C. Four pens were equipped with microswitches; the remaining four pens were each heated by two infrared lamps in constant operation. When chicks struck the microswitch, infrared lamps were turned on for 1 min during the learning phase when chicks were being conditioned to the experimental setup and 4 min during the experimental phase during which data were collected for analysis. Feed intake, gain, and mortality were recorded. Trials 1 and 2 were concluded at 28 days and Trials 3 and 4 concluded at 21 days. At the conclusion of the trials protein, fat, and water content of the birds were determined. Additional analysis for ash content was performed for Trials 1 and 2 only. No significant differences (P greater than .05) in gain, feed conversion, body composition, and mortality rate were found between treatments. Chicks provided with continuous heat were exposed to three times as much supplemental heat as operant conditioned groups yet feed efficiency was unaffected.
在四项试验中，408只、320只、160只和400只雏鸡被饲养在1.8×2.4米的围栏垫料上。每项试验使用八个围栏。在最初的6天里，环境温度保持在28摄氏度；在第7天，温度降至16摄氏度。四个围栏装有微动开关；其余四个围栏每个由两个持续运行的红外灯加热。在雏鸡适应实验设置的学习阶段，当雏鸡触动微动开关时，红外灯开启1分钟；在收集数据进行分析的实验阶段，红外灯开启4分钟。记录采食量、增重和死亡率。试验1和试验2在28天结束，试验3和试验4在21天结束。在试验结束时，测定鸡的蛋白质、脂肪和水分含量。仅对试验1和试验2进行了灰分含量的额外分析。在各处理之间，增重、饲料转化率、身体组成和死亡率没有显著差异（P大于0.05）。接受持续加热的雏鸡所接触的补充热量是操作性条件反射组的三倍，但饲料效率未受影响。
