Haley Charles, Dewey Catherine E, Widowski Tina, Friendship Robert
Department of Population Medicine, University of Guelph, Ontario.
Can J Vet Res. 2008 Oct;72(5):385-9.
An observational study was conducted from July to October 2004 to determine the association between in-transit losses of swine and internal trailer temperature after controlling for loading density, trip distance, herd size, and random trip effect. A convenience sample of 3 trucking companies was used to collect temperature, relative humidity, and global positioning data for 104 trips that delivered 21,834 pigs from 371 producers to Ontario abattoirs. The association between in-transit loss and trailer temperature was determined using the 90th percentiles of internal temperature for each trip. Average loading density was 0.36 m2/100 kg pig (range 0.28 to 0.50 m2/100 kg pig). Average in-transit loss was 0.12%; however, 94% of producers experienced no losses. As the 90th percentile of internal trailer temperature increased from a range of 8.6 degrees C to 23.3 degrees C to a range of 23.4 degrees C to 26.1degreesC, average in-transit loss ratio increased approximately 3-fold, with an additional 2-fold increase as the range increased from 26.2 degrees C to 28.9 degrees C to 29.0 degrees C to 30.5 degrees C. As the 90th percentile of temperature increased by 1degreesC over the full range of temperatures in this study, in-transit loss was expected to increase 1.26 times. The in-transit loss was expected to decrease 0.81 times for each 50-km increase in distance traveled between the farm and the abattoir.
2004年7月至10月进行了一项观察性研究，以确定在控制装载密度、行程距离、猪群规模和随机行程效应后，猪在运输途中的损失与拖车内部温度之间的关联。使用了3家运输公司的便利样本，收集了104次行程的温度、相对湿度和全球定位数据，这些行程将来自371个养殖场的21,834头猪运送到安大略省的屠宰场。使用每次行程内部温度的第90百分位数来确定运输途中损失与拖车温度之间的关联。平均装载密度为0.36平方米/100千克猪（范围为0.28至0.50平方米/100千克猪）。平均运输途中损失为0.12%；然而，94%的养殖场没有损失。随着拖车内部温度的第90百分位数从8.6摄氏度至23.3摄氏度的范围增加到23.4摄氏度至26.1摄氏度的范围，平均运输途中损失率增加了约3倍，当范围从26.2摄氏度至28.9摄氏度增加到29.0摄氏度至30.5摄氏度时，又增加了2倍。在本研究的整个温度范围内，温度的第90百分位数每升高1摄氏度，运输途中损失预计增加1.26倍。农场与屠宰场之间行驶距离每增加50公里，运输途中损失预计减少0.81倍。
