The level of the ECL and the PHA-L receptors were higher at the estrus than at diestrus. ECL and PHA-L receptors maintained a lower level at day 4 and 5 of pregnancy than those at the diestrus.

• ECL和PHA-L受体水平在动情期高于动情间期；孕期呈现先下降后上升的趋势；且在孕4、孕5 d的水平显著低于动情间期和动情期(P<0.；01)。