Cystic Ovaries
This disease primarily affects breeding age sows. The key clinical signs include: sow continually on heat; pigs show discomfort; repeat matings.Background and history
This is a common condition, particularly in old sows. Large cysts develop in the ovaries which often produce high levels of oestrogen.
The carcass is safe for human consumption.
Clinical signs
- Abnormal heat.
- Not accept the boar at mating.
- Continually on heat.
- Infertility.
- Repeat matings.
- Pigs show pain/discomfort.
- May grind teeth.
Diagnosis
Made on clinical grounds and normally only involves individual animals. Carry out a post-mortem examination of the ovaries.
Post-mortem lesions
- Abnormally sized ovaries – 25mm in diameter.
- Cysts 2–3cm in diameter in the ovaries, filled with clear fluid.
- Occasionally regressing corpora lutea in ovary.
Causes
- Age.
- Hereditary.
- Stress.
- Mycotoxins.
- Breeding.
- Hormonal malfunctions.
- Hormone misuse.
- Mouldy bedding or food.
- Badly stored grains.
Prevention
- Reduce causes of stress on sows.
- Consider delayed weaning.
Treatment
- Culling of affected sows is most common.
- Synthetic hormone treatment:
- Progestogen by mouth
- Gonadotrophic hormones by injection.