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Effect of space allowance and cage size on laying hens housed in furnished cages, Part I: Performance and well-being

机译：空间津贴和笼尺寸对饲养母鸡铺设母鸡的影响，第一部分：性能和福祉

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There are few published data on the effects of housing laying hens at different densities in large furnished cages (FC; a.k.a. enriched colony cages). The objective of this study was to determine the effects of housing laying hens at 2 space allowances (SA) in 2 sizes of FC on measures of production and well-being. At 18 wk of age, 1,218 LSL-Lite hens were housed in cages furnished with a curtained nesting area, perches, and scratch mat, and stocked at either 520 cm(2) (Low) or 748 cm2 (High) total floor space. This resulted in 4 group sizes: 40 vs. 28 birds in smaller FC (SFC) and 80 vs. 55 in larger FC (LFC). Data were collected from 20 to 72 wks of age. There was no effect of cage size (P = 0.21) or SA (P = 0.37) on hen day egg production, egg weight (P-Size = 0.90; P-SA = 0.73), or eggshell deformation (P-Size = 0.14; P-SA = 0.053), but feed disappearance was higher in SFC than LFC (P = 0.005). Mortality to 72 wk was not affected by cage size (P = 0.78) or SA (P = 0.55). BW (P = 0.006) and BW CV (P = 0.008) increased with age but were not affected by treatment. Feather cleanliness was poorer in FC with low SA vs. high (P 0.0001) and small vs. large FC (P 0.0001). Feather condition was poorer in low SA (P = 0.048) and the best in small cages with high SA (P = 0.006), but deteriorated in all treatments over time (P 0.0001). Treatments did not affect the breaking strengths of femur, tibia, or humerus, proportions of birds suffering keel deformations, or foot health scores. Overall, the SA studied in the 2 cage sizes in this trial had few effects on production parameters. However, stocking birds at the lower space allowance resulted in some measures of poorer external condition in both sizes of FC, which indicates that the welfare of hens housed at the lower space allowance may be compromised according to some welfare assessment criteria.
机译：有关房屋铺设母鸡在大型家具笼中不同密度的影响（FC; A.K.A.丰富的殖民地笼）的效果，有很少的公布数据。本研究的目的是确定2种空间余量（SA）在2种FC的生产和福祉措施中的2种空间津贴（SA）的影响。在18周的年龄，1,218岁的LSL-Lite母鸡被安置在带有舒适的嵌套区域，栖息地和刮擦垫的笼子里，并且在520厘米（2）（低）或748cm2（高）总占地面积。这导致4组尺寸：40与较小Fc（SFC）和80次较大的FC（LFC）中的85次。数据从20到72周年的年龄收集。笼子大小（p = 0.21）或sa（p = 0.37）没有影响鸡蛋生产，鸡蛋重量（p尺寸= 0.90; p-sa = 0.73），或蛋壳变形（p尺寸= 0.14 ; P-SA = 0.053），但SFC的饲料消失高于LFC（P = 0.005）。死亡率至72周不受笼尺寸的影响（P = 0.78）或SA（P = 0.55）。 BW（p = 0.006）和BW CV（p = 0.008）随着年龄的增长而增加，但不受治疗的影响。羽毛清洁度在FC中较差，具有低SA与高（P＆LT; 0.0001）和小型Fc（P <0.0001）。低SA（P = 0.048）和高SA的小笼子中最好的羽毛状况（P = 0.006），但随着时间的推移，所有治疗中的劣化（P <0.0001）。治疗不会影响股骨，胫骨或肱骨的破坏优势，患有龙骨变形的鸟类的比例，或脚健康评分。总体而言，在该试验中的2个笼子尺寸中研究的SA对生产参数产生了很少的影响。然而，在较低空间津贴的放养鸟类导致两种FC尺寸较差的外部条件的措施，这表明饲养较低空间津贴的母鸡福利可能会根据一些福利评估标准受到损害。

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