The parturition defect in steroid 5alpha-reductase type 1 knockout mice is due to impaired cervical ripening.
The most common occasions for deworming the animals were at turn out (86%) and after parturition (31%).
Parturition and changes of the environmental conditions are the stress-inducing factors.
Mid-pregnancy: day k63 to day k21, relative to parturition, and periparturient period: day k21 to day 42.
However, preterm parturition in humans is not associated with a systemic decrease in progesterone levels.
Infection of calves appears to occur shortly after parturition with the most likely source of infection being their dams.
The structural characteristics of spontaneously ruptured fetal membranes: their relationship to membrane rupture and parturition.
A promising way forward is the application of global approaches such as genomics and proteomics to parturition research.
