Pregnancy per AI, in Experiment 1, according to the concentration of progesterone at—4 d, at the day of AI (0 d) and 7 d post timed AI.

Pregnancy per AI, in Experiment 1, according to the concentration of progesterone at—4 d, at the day of AI (0 d) and 7 d post timed AI.实验1中，人工授精（Artificial Insemination，简称AI）受孕率的统计分析基于以下三个时间点的孕酮（progesterone）浓度：定时人工授精前4天、人工授精当日（0天）以及定时人工授精后7天。