What is the primary annoyance caused by stable flies to domestic animals?

The primary annoyance caused by stable flies to domestic animals is their irritating bites. Stable flies feed on the blood of animals, and their bites can be quite painful, leading to significant discomfort for the animals affected. This discomfort prompts the animals to react by stamping their feet, swishing their tails, and attempting to flee from the source of irritation, which can disrupt their normal behavior and routine.

While excessive buzzing sounds may be present due to stable flies, they are not the primary issue; the pain and irritation from bites are what most directly affect the animals. The presence of larvae is typically more an issue in terms of breeding and pest management rather than direct annoyance to the animals. Although stable flies can impact livestock and dairy operations by potentially reducing milk production as a secondary effect, the immediate annoyance they cause directly relates to the biting behavior. Thus, irritating bites is the most relevant concern when discussing the primary annoyance stable flies cause to domestic animals.