本实验测定了初开产的北京鸭第一回产蛋周期中血浆孕酮含量的昼夜变化。选用北京双桥1系未开产成年母鸭6只笼养。在第一回产蛋周期内连产三个蛋的60小时间隔内,每隔2小时自隐静脉采血1.5毫升,并在开产前一周以同样间隔时间采集24小时的血样作对照。用放射免疫法测定血浆孕酮含量,测得批内和批间变异系数分别为3.5—7.4％和10％。 The experiment determined the diurnal changes of plasma progesterone content during the first cycle of first-born Pekin duck. Selection of Beijing Shuangqiao 1 Department of unopened adult female duck 6 cage. During the 60-hour interval producing three eggs during the first round of egg production, 1.5 ml of blood was drawn from the saphenous vein every 2 hours and a 24-hour blood sample taken at the same interval for the week preceding the first birth. The content of plasma progesterone was determined by radioimmunoassay. The coefficient of variation (CV) was 3.5-7.4% and 10% respectively.