The impact of nutrient density, feed form, and photoperiod on the walking ability and skeletal quality of broiler chickens
The impact of nutrient density, feed form, and photoperiod on the walking ability and skeletal quality of broiler chickens
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DOI：
10.1093/ps/86.10.2117
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发表时间：
2007-10-01
期刊：
影响因子：
4.4
通讯作者：
Gomis, S.
中科院分区：
文献类型：
--
作者：
Brickett, K. E.;Dahiya, J. P.;Gomis, S.
本研究旨在探讨3种营养密度（低、中、高密度）、2种饲料形式（醪、颗粒）和2种光照方案（20 L：AD、12 L：12 D）对幼龄（35 d）肉仔鸡行走能力和骨骼质量的主效应和交互效应。每种处理（营养密度x饲料形式x照明程序亚类）随机选择48只鸡（0 d），以评估它们在11、18、25和32 d的步态评分（GS）和BW。在32天时选择来自不同GS分类的鸟类样本进行股骨和胫跗骨的X光照片和组织学检查。在35 d时从右侧胫骨跗骨处检测骨灰（BA）含量，以评估骨质量。总体而言，平均GS值较低（GS < 1）。灯光和性之间存在着相互作用。提供20 L：AD的雄性具有比雌性（0.45）更高的GS（0.74），并且该得分大于提供12 L：12 D的肉鸡（雄性和雌性分别为0.34和0.26）。与颗粒日粮（0.62）相比，饲喂醪液降低了GS（0.29）。GS随着年龄的增长而增加，到32 d时，2.43%的鸡GS >= 3。结果表明，饲粮中的BA含量（50.6%）高于饲粮中的BA含量（49.8%），且12 L：12 D的BA含量（50.5%）高于20 L：4D的BA含量（48.9%）。最后，雄性的BA含量（49.8%）低于雌性（50.6%）。基于性别的BW和GS之间存在正相关，其中11、18和25 d的2 BW影响32 d的鸟类活动性（r（2）=0.39、0.49和0.50对于雄性; r（2）= 0.34、0.37和0.36对于雌性）。放射学和组织学不受GS的影响。这项研究证实，降低生长速度改善GS，但也表明，整体鸟类的流动性是好的，骨骼疾病的发病率低。
The aim of this study was to examine the main and interaction effects of 3 dietary nutrient densities (low-, medium-, high-density), 2 feed forms (mash, pellet), and 2 lighting programs (20L:AD, 12L:12D) on the walking ability and skeletal quality of broiler chickens raised to a young age (35 d). Forty-eight birds per treatment (nutrient density x feed form x lighting program subclass) were randomly selected (0 d) for assessment of their gait score (GS) and BW at 11, 18, 25, and 32 d. Samples of birds from various GS classifications were selected at 32 d for radiographs and histology of the femur and tibiotarsus. Bone ash (BA) content was evaluated at 35 d from the right tibiotarsus to assess bone quality. Overall, the mean GS values were low (GS < 1). An interaction existed between lighting and sex. Males provided with 20L:AD had a higher GS (0.74) than females (0.45), and this score was greater than for broilers provided with 12L:12D (0.34 and 0.26 for males and females, respectively). Feeding mash reduced the GS (0.29) compared with pellet rations (0.62). The GS increased with age, and by 32 d 2.43% of birds had a GS >= 3. Broilers fed mash had a higher BA content (50.6%) than birds fed pellet diets (49.8%), and the 12L:12D value (50.5%) was greater than for 20L:4D (48.9%). Last, males had a lower BA content (49.8%) than females (50.6%). A positive correlation existed between BW and GS based on sex, where 2 BW at 11, 18, and 25 d affected bird mobility at 32 d (r(2)=0.39, 0.49, and 0.50 for males; r(2) = 0.34, 0.37, and 0.36 for females, respectively). Radiography and histology were unaffected by GS. This study confirmed that a reduced growth rate improved GS but also demonstrated that overall bird mobility was good and the incidence of skeletal disease was low.