Comparison of eight logger layouts for monitoring animal-level temperature and humidity during commercial feeder cattle transport
Comparison of eight logger layouts for monitoring animal-level temperature and humidity during commercial feeder cattle transport
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DOI：
10.2527/jas.2013-7432
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发表时间：
2014-09-01
影响因子：
3.3
通讯作者：
Schwartzkopf-Genswein, K.
中科院分区：
文献类型：
--
作者：
Goldhawk, C.;Crowe, T.;Schwartzkopf-Genswein, K.
在运输过程中测量动物水平的条件提供了关于运输过程中环境挑战对牛福利的真正风险的信息。然而，由于在动物层面上放置伐木器的限制，需要确定适当的代理位置。本研究的目的是评估8种天花板水平伐木机在盆腹式拖车甲板和腹室的分布，以评估饲养牛商业运输5~18h期间动物水平的温度和湿度。运输过程中的环境条件范围为3.6至45.2摄氏度(20.3+/-7.61摄氏度，平均+/-SD)。考虑到整个旅程，不同的伐木机布局中，天花板温度和动物水平温度之间的平均差异是相似的(P>；0.05)。相对于动物水平和天花板水平条件之间的差异的大小，不同地点之间的温湿度差异的不确定性很高。单记录仪的布局需要更大的调整，以预测在整个旅程中或拖车静止时任一舱内的动物水平条件(P<；0.05)。在某些记录仪布局中，回归方程预测动物水平条件的能力存在微小但显著的差异，这些条件与牛的体重和可用空间相对于身体大小有关。此外，仅根据整个旅程评估记录仪布局，而不考虑平稳期，不能充分捕捉布局性能的变异性。总而言之，为了充分监测动物水平的温度和湿度，建议在温暖天气下运输饲养牛的盆腹式拖车的甲板和腹部车厢内采用单台伐木机布置，而不是分布在整个车厢内的10台伐木机。
Measuring animal-level conditions during transit provides information regarding the true risk of environmental challenges to cattle welfare during transportation. However, due to constraints on placing loggers at the animal level, there is a need to identify appropriate proxy locations. The objective was to evaluate 8 distributions of ceiling-level loggers in the deck and belly compartments of pot-belly trailers for assessing animal-level temperature and humidity during 5 to 18 h commercial transportation of feeder cattle. Ambient conditions during transportation ranged from 3.6 to 45.2 degrees C (20.3 +/- 7.61 degrees C, mean +/- SD). When considering the entire journey, average differences between ceiling and animal-level temperatures were similar among logger layouts (P > 0.05). The uncertainty in the difference in temperature and humidity between locations was high relative to the magnitude of the difference between animal-and ceiling-level conditions. Single-logger layouts required larger adjustments to predict animal-level conditions within either compartment, during either the entire journey or when the trailer was stationary (P < 0.05). Within certain logger layouts, there were small but significant differences in the ability of regression equations to predict animal-level conditions that were associated with cattle weight and available space relative to body size. Furthermore, evaluation of logger layouts based solely on the entire journey without consideration of stationary periods did not adequately capture variability in layout performance. In conclusion, to adequately monitor animal-level temperature and humidity, 10 loggers distributed throughout the compartment was recommended over single-logger layouts within both the deck and belly compartments of pot-belly trailers transporting feeder cattle in warm weather.