School of Agriculture and Food Sciences, Animal Science Group, The University of Queensland, Gatton, QLD, 4343, Australia.
ICAR-National Institute of Animal Nutrition and Physiology, Adugodi, Bangalore, India.
Int J Biometeorol. 2018 Jan;62(1):3-8. doi: 10.1007/s00484-017-1433-y. Epub 2017 Sep 11.
Thirty-six Black Angus steers were used in a replicated study; three replicates of 12 steers/replicate. Steers had an initial non-fasted BW of 392.3 ± 5.1, 427.5 ± 6.3, and 392.7 ± 3.7 kg for each replicate, respectively. Steers were housed outside in individual animal pens (10 m × 3.4 m). Each replicate was conducted over a 6-day period where infrared thermography (IRT) images were collected at 3-h intervals, commencing at 0600 h on day 1 and concluding at 0600 h on day 6. Rumen temperatures (T ) were measured at 10-min intervals for the duration of each replicate using a radio-frequency identification (RFID) rumen bolus. These data were used to determine the relationship with surface temperature of the cattle, which was determined using IRT. Individual T were converted to an hourly average. The relationship between T and surface temperature was determined using Pearson's correlation coefficient. There were no linear trends between mean hourly T and mean surface temperature. Pearson's correlation coefficient indicated that there were weak associations (r ≤ 0.1; P < 0.003) between T and body surface temperature. These data suggest that there was little relationship between the surface temperature and T .
在一项重复研究中使用了 36 头黑安格斯阉牛；每个重复有 3 个 12 头阉牛的重复。牛在每个重复中的初始空腹体重分别为 392.3±5.1、427.5±6.3 和 392.7±3.7 公斤。牛被安置在户外的单独动物围栏中（10 米×3.4 米）。每个重复进行了 6 天，从第 1 天的 0600 小时开始，每隔 3 小时采集一次红外热成像（IRT）图像，到第 6 天的 0600 小时结束。使用射频识别（RFID）瘤胃灌胃，在每个重复期间每隔 10 分钟测量一次瘤胃温度（T）。这些数据用于确定与使用 IRT 确定的牛体表温度的关系。将每个 T 个体转换为每小时平均温度。使用 Pearson 相关系数确定 T 和表面温度之间的关系。平均每小时 T 和平均表面温度之间没有线性趋势。Pearson 相关系数表明 T 和体表面温度之间存在弱关联（r ≤ 0.1；P < 0.003）。这些数据表明，表面温度和 T 之间的关系很小。
