What reproductive issue can occur in older pigs infected with Pseudorabies?

Older pigs infected with Pseudorabies can experience abortion due to the impact of the virus on the reproductive system. Pseudorabies is caused by a virus that affects the nervous system and reproductive functions in pigs. In pregnant sows, infection with the virus can lead to fetal infection, resulting in embryonic death or abortion. This is of particular concern in older animals, who may have other underlying health issues that can exacerbate the effects of the infection.

The mechanism behind this involves the virus causing systemic disease, which can lead to complications in pregnancy, including placentitis and other issues that directly affect fetal viability. As a result, abortion becomes a significant reproductive concern in these cases.

In contrast, infertility is also a potential outcome—but it typically manifests over a longer term rather than as an acute result of infection, and calving difficulties relate more to the delivery process rather than the outcomes of an infection like Pseudorabies. Additionally, excessive milk production is not associated with this viral infection; rather, it is influenced by other factors such as genetics, nutrition, and management practices.