Which of the following is NOT a clinical sign of Pseudorabies in older pigs?

The correct answer is excessive weight gain, as this is not recognized as a clinical sign of Pseudorabies in older pigs. Pseudorabies, caused by the Suid herpesvirus 1, primarily affects the respiratory and nervous systems of pigs and can lead to significant health issues, especially in younger animals.

In older pigs, common clinical signs include respiratory manifestations such as coughing and nasal discharge, which are indicative of the viral infection's effects on the respiratory tract. Neurological signs, such as incoordination and tremors, can also be observed due to the virus's impact on the central nervous system. Additionally, reproductive failure in sows and gilts can occur due to the stresses brought on by the disease, resulting in complications like abortions or stillbirths.

Excessive weight gain, however, does not correlate with the disease's impact. In fact, infection often leads to a decline in overall health, leading to weight loss or stunted growth rather than an increase in weight. Understanding the clinical signs helps in diagnosing and managing Pseudorabies effectively within swine populations.