These are not unattainable goals for the sheep flock, although, there are not a high number of sheep capable of performance such as this. However, most flocks have a few ewes that fit this description. The Birds and The Bees Sheep do not need an uncomfortable talk from their parents or to watch a film in school about the birds and the bees. Good sheep instinctively know what to do and when to do it. Sheep are technically described as seasonally polyestrous in their breeding patterns.
Most sheep breed only in the fall and winter months.
Sheep are known as short day breeders. The ratio of light to dark in a 24-hour period is an important control in physiological responses in reproduction. Thus, it was a survival advantage for the specie to give birth to their young during periods of favorable weather and feed supplies. Therefore, through natural selection, sheep were propagated that bred in the fall and gave birth in the spring. Most breeds of sheep are seasonal in breeding activity, because of this selection.