PSII-16 Thermal sensor-based multiple object tracking system for estrus detection in Korean native beef cattle

摘要

This experiment was conducted to improve estrus detection using a thermal sensor based on multiple object tracking system. A total of six Hanwoo (Korean native beef cattle, BW= 404 ± 58 kg) were used in this study. They were housed in a 5 × 10 m pen by three animals per replication. The total amount of moving distance and feed intake were measured before and after estrus period. The infrared thermography camera (FLIR A615, FLIR SYSTEMS, USA) was placed approximately 9 m above ground to take thermal images. The video files were analyzed to calculate moving distance of experimental animals by the tracking system which was developed by our previous research. Each animal in a pen was tracked on thermal video files, and then moving distances were calculated by topographic surface-based object segmentation, velocity weight, and the river-bed refinement. Feed intake was calculated every day at 0900 by weighing residual feed. On the day before estrus, the total moving distance of experimental animals was 6,434 m (Pen 1= 6,873 m, Pen 2= 5,995m), whereas it was 15,121 m (Pen 1= 17,434 m and Pen 2= 12,808 m) on the estrus day, showing 2.35 times increase (P < 0.05) in moving activity. Feed intake was decreased (P < 0.05) by 11% on estrus day (29.4 vs. 26.1 kg). A decrease in feed intake and an increase in movement of beef cattle on the estrus day, were obvious signs that have been well documented not only in previous researches and but empirical knowledge. In this study, however, the exact moving distance of Korean native beef cattle was calculated by the thermal imaging video tracking system. Therefore, this multiple object tracking system could be applied in practice to detect estrus of beef cattle.