What is the main feature of meat or terminal sire breeds of sheep?

The main feature of meat or terminal sire breeds of sheep is their high feed efficiency and muscularity. These breeds are specifically developed and selected for their ability to grow quickly and produce a high yield of meat, making them valuable in meat production systems. The emphasis on muscularity means that they have a greater level of muscle development, often seen in characteristics such as a broader body, thicker hindquarters, and overall more robust physiques compared to other breeds.

These traits contribute to their efficiency on feed, as they can convert feed into muscle mass more effectively than sheep bred for other purposes. Raising terminal sire breeds allows farmers to optimize their outputs in meat production, which has significant economic advantages. In contrast, other options pertain to characteristics that are not central to the purpose of terminal sire breeds, such as wool quality or adaptability to climate.