the peripheral blood and milk contain two steroids , whose concentrations can be monitored and used as a tool for pregnancy diagnosis in cattle : ( 1 ) progesterone of maternal origin , which must be assayed between days 21-24 after al , allows very early diagnosis of non pregnancy or of gestation onset , ( 2 ) oestrone sulfate secreted by the feto-placental unit is a good means for confirming pregnancy over 110 days after al .
C0033308
progesterone
C0032961
pregnancy