What is one sign of a sheep being in heat (estrus)?

One sign of a sheep being in heat (estrus) is increased vocalization. During this time, ewes become more active and exhibit behaviors aimed at attracting rams. Increased vocalization is a way for them to communicate their reproductive readiness, which can include bleating or other vocal sounds. This heightened vocal activity often signifies that the ewe is trying to signal to potential mates that she is in estrus, making it a crucial observation for breeders looking to identify the optimal time for breeding.

The other signs listed, such as decreased appetite, increased weight gain, and decreased social interaction, do not accurately indicate the estrous state in sheep. Instead, these behaviors may align with other health or environmental factors unrelated to estrus. Understanding the signs of estrus is vital for effective sheep management, particularly in breeding programs.