Effect of prostaglandin analogue on progesterone-treated pony mares during early pregnancy.

The study researches the impact of a prostaglandin analogue on pony mares that are on a progesterone treatment in their early pregnancy. The results suggest that the progesterone treatment failed to consistently prevent pregnancy failure when a prostaglandin analogue was administered.

Study Context and Methodology

• The researchers conducted a study to understand the effect of a prostaglandin analogue on pregnancies in Welsh pony mares that were given progesterone treatment.
• Progesterone, a hormone, plays a significant role in the reproduction process, including maintaining pregnancy in mares.
• The study administered varying dosages of progesterone – 50 mg, 100 mg, or 150 mg – on alternate days to seven Welsh pony mares with a total of nine pregnancies. This treatment began on the 21st day of gestation.

Prostaglandin Analogue Administration

• A prostaglandin analogue was given to the pony mares on the 27th day of their gestation period.
• Prostaglandins are lipid compounds that perform various roles in the body. They are associated with the induction of labor as they can cause the uterus to contract. This is the reason why their administration could possibly lead to pregnancy failure.

Result of the Study

• All but two pregnancies resulted in failure following the administration of the prostaglandin analogue.
• Note that the two successful cases were among the mares receiving the highest progesterone dose of 150 mg.
• However, the conclusion from these observations was that the progesterone treatment was not consistently successful in preventing pregnancy termination when the mares were administered with a prostaglandin analogue.