Camp T H, Stevens D G, Stermer R A, Anthony J P
J Anim Sci. 1981 Jun;52(6):1219-24. doi: 10.2527/jas1981.5261219x.
Five shipments of feeder calves (965 head hauled in 11 drop-center trailers) were shipped 1,600 km by tractor trailer from Algood, Tennessee, to Bushland, Texas, during the fall seasons of 1976, 1977 and 1978. Shrink, incidence of shipping fever and subsequent feedlot performance of these feeder calves were analyzed. There were significant differences in shrink and subsequent feedlot performance between calves shipped on different dates. In only one instance was there a significant difference in shrink between trucks of steers shipped on the same date, and this was due to a difference of in-transit time between trucks. There were no significant differences in shrink, incidence of shipping fever of feedlot performance between calves shipped in different trailer compartments, nor were there any interactions between shipping dates and trailer compartments for shrink, incidence of shipping fever and feedlot performance. The number of calves treated for shipping fever did not differ significantly among trailer compartments, but did differ among shipment dates. Significant differences in morbidity between shipping dates indicate that the incidence of shipping fever is apparently affected by environmental conditions before, during and immediately after transit. The results indicate that multiple truckloads of calves, if traveling together, can be treated as a single unit for the statistical analysis of shrink, incidence of shipping fever and feedlot performance.
在1976年、1977年和1978年秋季，五批育肥牛犊（用11辆低栏挂车运输965头）由牵引车挂车从田纳西州的阿尔古德运往得克萨斯州的布什兰，运输距离为1600公里。分析了这些育肥牛犊的失重、运输热发病率及后续育肥场性能。不同日期运输的牛犊在失重及后续育肥场性能方面存在显著差异。仅在一个实例中，同一天运输的公牛卡车之间在失重方面存在显著差异，这是由于卡车之间运输时间的差异所致。不同挂车车厢运输的牛犊在失重、运输热发病率或育肥场性能方面没有显著差异，运输日期和挂车车厢之间在失重、运输热发病率和育肥场性能方面也没有任何交互作用。因运输热接受治疗的牛犊数量在挂车车厢之间没有显著差异，但在运输日期之间存在差异。运输日期之间发病率的显著差异表明，运输热的发病率显然受运输前、运输期间和运输后立即出现的环境条件影响。结果表明，多辆卡车运输的牛犊如果一起运输，在对失重、运输热发病率和育肥场性能进行统计分析时可视为一个单一单元。
