The experiment was carried out on 19 Jersey and 50 Friesian postpartum cows to studythe procedure and the pattern of the uterine and cervical involution(UCI)and the factors af-fecting its rate by using electronic callipers and B-mode ultrasound scanner.

• 应用电测径器、B-型超声实时断层扫描仪(B-超)以及放射免疫等仪器和技术,对19头产后娟珊牛和50头荷兰黑白花牛的子宫复旧过程、规律以及影响其复旧速度的因素进行了研究。