Early locomotor activity in broilers and the relationship with body weight gain.
Early locomotor activity in broilers and the relationship with body weight gain.
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DOI：
10.1016/j.psj.2022.102086
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发表时间：
2022-10
期刊：
影响因子：
4.4
通讯作者：
Ellen, Esther D.
中科院分区：
文献类型：
--
作者：
van der Sluis, Malou;Asher, Lucy;Rodenburg, T. Bas;de Haas, Yvette;de Klerk, Britt;Ellen, Esther D.
快速生长的肉鸡相对不活跃，这被认为是高生长率选择的结果。这种活动水平的降低被认为是腿部无力和相关腿部健康问题的主要原因。增加活动，特别是在生命早期，被认为对腿部健康有积极影响，但早期活动和生长之间的关系尚不清楚。更清楚地了解生命早期活动与体重增加之间的关系，有助于确定选择增加早期活动如何影响肉鸡体重增加。在这里，实施了射频识别（RFID）跟踪系统，以记录5个生产轮次中的整个生命周期中的每日个体肉鸡活动。由于单独的平均活动水平不能捕获活动随时间的变化，因此基于个体鸟类的每日移动距离确定活动的多个（动态）描述符，重点关注0至15天的时间段。在个体水平上测定活动的平均值、偏度、均方根误差（RMSE）、自相关性和熵（偏差），以及平均日增重（ADG）。测定了318只鸟的活动描述符与ADG之间的关系。当结合来自不同生产轮次的数据以及考虑生产轮次和起始体重时，观察到ADG和RMSE之间的负相关关系，表明活动水平变化更大的鸟类ADG较低。然而，活动描述符，结合记录回合和起始重量，仅解释了ADG变化的一小部分（8%）。因此，建议在未来的研究中也记录影响ADG的其他因素（例如，所提供的饲料类型和饲料摄入量）并模拟生长曲线。总的来说，这项研究表明，增加早期活动并不一定会对体重增加产生负面影响。如果选择增加活动对腿部健康有预期的积极影响，这可能有助于改善肉鸡的健康和福利。
Fast-growing broilers are relatively inactive and this is thought to be a result of selection for high growth rates. This reduced activity level is considered a major cause of leg weakness and associated leg health problems. Increased activity, especially early in life, is suggested to have positive effects on leg health, but the relationship between early activity and growth is unclear. A clearer understanding of the relationship between activity early in life and body weight gain could help determine how selecting on increased early activity could affect body weight gain in broilers. Here, a radio frequency identification (RFID) tracking system was implemented to record daily individual broiler activity throughout life, in 5 production rounds. As mean activity levels alone do not capture the variation in activity over time, multiple (dynamic) descriptors of activity were determined based on the individual birds’ daily distances moved, focusing on the period from 0 to 15 days old. The mean, skewness, root mean square error (RMSE), autocorrelation, and entropy of (deviations in) activity were determined at the individual level, as well as the average daily gain (ADG). Relationships between activity descriptors and ADG were determined for 318 birds. Both when combining the data from the different production rounds and when taking production round and start weight into account, a negative relationship between ADG and RMSE was observed, indicating that birds that were more variable in their activity levels had a lower ADG. However, the activity descriptors, in combination with recording round and start weight, explained only a small part (8%) of the variation in ADG. Therefore, it is recommended for future research to also record other factors affecting ADG (e.g., type of feed provided and feed intake) and to model growth curves. Overall, this study suggests that increasing early activity does not necessarily negatively affect body weight gain. This could contribute to improved broiler health and welfare if selecting for increased activity has the expected positive effects on leg health.
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作者：
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DOI：
10.1016/j.cbd.2020.100700
发表时间：
2020-09-01
影响因子：
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作者：
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通讯作者：
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