Changes

* Mimic foetal cortisol to remove the progesterone block by upregulating enzymes that will increase the oestrogen:progesterone ratio (for more information see [[Parturition_-_Endocrine_Control_of_Parturition_-_Anatomy_%26_Physiology|endocrinology of parturition]]).

* Mimic foetal cortisol to remove the progesterone block by upregulating enzymes that will increase the oestrogen:progesterone ratio (for more information see [[Parturition_-_Endocrine_Control_of_Parturition_-_Anatomy_%26_Physiology|endocrinology of parturition]]).

* '''Short Acting''': apply 2-3 days before the dur date (270+ days gestation).  Complications include [[Parturition_-_Risks_in_Parturition_-_Anatomy_%26_Physiology#Retained_Placenta|retained placenta]] and stillbirth.

* '''Short Acting''': apply 2-3 days before the due date (270+ days gestation).  Complications include [[Parturition_-_Risks_in_Parturition_-_Anatomy_%26_Physiology#Retained_Placenta|retained placenta]] and stillbirth.

* '''Medium-Long Acting''': apply 2-3 weeks before the due date.  Administration after 260 days will cause no advance of the calving date. Administration before 260 days will cause neonatal mortality.  Thus use of these corticosteroids is reliant upon accurate record keeping by the farmer so that exact dates are known.

==== Corticosteroid & PGF2α  Analogue ====

==== Corticosteroid & PGF2α  Analogue ====