Renden J A, Moran E T, Kincaid S A
Department of Poultry Science, Auburn University, Alabama 36849, USA.
Poult Sci. 1996 Nov;75(11):1345-50. doi: 10.3382/ps.0751345.
This study tested the effects of light schedules on performance and yields of broiler chickens. In Experiment 1, light treatments during Days 1 to 49 of age were: 1) 23 h light (L):1 h dark (D); 2) 16L:8D;3) 16L: 3D:1L:4D; and 4) 16L:2D:1L:2D:1L:2D. In Experiment 2, Light Treatments 1 and 2 were the same as Treatments 1 and 4, respectively, in Experiment 1; 3) 23L:1D Days 1 to 7, 16L:8D Days 8 to 14, the light period was increased by 2 h/wk during Days 15 to 35, and 23L:1D Days 36 to 42; and 4) 23L:1D Days 1 to 7, 16L:8D Days 8 to 14, 16L:3D: 2L:3D Days 15 to 21, 16L:2D:4L:2D Days 22 to 28, 16L: 1D:6L:1D Days 29 to 35, and 23L:1D thereafter. In Experiment 1, BW was greater in Treatment 4 than Treatment 2 at 22 (708 vs 642 g) and 49 d (2,948 vs 2,797 g), percentage leg problems was lower in Treatments 2 to 4 (9, 10 and 6%, respectively) than in Treatment 1 (20%), and percentage Grade A was greater in Treatment 4 than Treatment 2 (60 vs 46%) at 49 d. In Experiment 2, BW was greater in Treatment 1 (692 g) than Treatments 3 (617 g) and 4 (620 g) at 21 d, and the incidence of tibial dyschondroplasia was lower in Treatment 2 (3.1%) than Treatment 3 (15.3%) at 42 d. There were no differences for mortality among treatments in either experiment.
本研究测试了光照制度对肉鸡生产性能和产量的影响。在实验1中，1至49日龄期间的光照处理为：1）23小时光照（L）：1小时黑暗（D）；2）16L：8D；3）16L：3D：1L：4D；4）16L：2D：1L：2D：1L：2D。在实验2中，光照处理1和2分别与实验1中的处理1和4相同；3）1至7日龄为23L：1D，8至14日龄为16L：8D，15至35日龄期间光照时长每周增加2小时，36至42日龄为23L：1D；4）1至7日龄为23L：1D，8至14日龄为16L：8D，15至21日龄为16L：3D：2L：3D，22至28日龄为16L：2D：4L：2D，29至35日龄为16L：1D：6L：1D，此后为23L：1D。在实验1中，22日龄时处理4的体重（708克对642克）和49日龄时（2948克对2797克）均高于处理2，处理2至4的腿部问题百分比（分别为9%、10%和6%）低于处理1（20%），49日龄时处理4的A级百分比高于处理2（60%对46%）。在实验2中，21日龄时处理1的体重（692克）高于处理三（617克）和处理4（620克），42日龄时处理2的胫骨软骨发育不良发病率（3.1%）低于处理3（15.3%）。两个实验中各处理间的死亡率均无差异。
