Some fillies may exhibit estrus as yearlings. The population is now managed by adopting out yearlings, both fillies and gelded colts. In foals and yearlings, the digital cushion is composed of fibro-fatty, soft tissue. While some male yearlings stay within the female herd, the others join a bachelor herd. There are no special age-related terms for young horses older than yearlings. Females first come into estrus and breed as yearlings or as 2-year-olds. The pups were relocated to Kure Atoll and released as yearlings. Only about half of those pups survive and become yearlings. Females breed for the first time when they are yearlings. Young female gazelles may associate with their mothers as yearlings. "Type II disease" can occur in yearlings and older cattle. Females emerge slightly later, followed by female and then male yearlings. In the northern hemisphere&colon; 164 yearlings sold for an average $165,000; top price $950,000. These bachelor colonies also house yearlings of both sexes. They then advance to become Yearlings, and finally Old Cadets.