Prostaglandins (PGs) are naturally occurring chemicals that control reproductive activities in animals. Prostaglandins were first found in human and animal semen in 1930 and were considered to originate from the prostate gland, hence the name. In the 1960s, studies found that PGF2α, secreted by the endometrium, can dissolve the corpus luteum in gilts, indicating that the uterus is a significant source of prostaglandins.
Today, prostaglandins are known for their capacity to:
- Control corpus luteum function.
- Promote uterine contractions.
- Support ovulation.
- Influence implantation of fertilized eggs.
These features make prostaglandins a valuable tool for controlling sow reproduction.
Role in Estrus Regulation of Sows
Prostaglandins predominantly cause luteolysis, which results in a fast drop in progesterone levels and the onset of estrus. Sow reproduction, on the other hand, differs significantly from that of cattle.
- Prostaglandins cannot dissolve sows' corpus luteum within the first 12 days after ovulation.
- As a result, a single prostaglandin injection cannot consistently synchronize estrus in sows when the luteal phase is unknown.
- To achieve synchronized estrus in sows, oral allylprogesterone, a progesterone analogue, is frequently necessary.
Limitations in current farm practices
To stimulate quick estrus, some farms treat sows with prostaglandins and then follicle-stimulating hormone (FSH). This strategy, however, may be restricted in effectiveness due to the sow luteal phase's unique biological restrictions.
since a result, the use of prostaglandins for estrus synchronization in sows should be carefully addressed, since alternate regimens may provide superior reproductive outcomes.
Conclusion
Prostaglandins remain an important tool in pig reproductive management, particularly for modulating luteal activity and promoting estrus. However, due to species-specific reproductive physiology, their use in estrus synchronization in sows is limited, and careful preparation is required to attain the best outcomes.
