Colts and geldings carry and fillies . Mares and geldings can be pastured together. Colts and geldings carry a weight of ; fillies carry . EIPH occurs less frequently in stallions than mares or geldings. Necks are fairly well crested in mares and geldings and heavily crested in mature stallions. Mares and geldings were preferred over less-easily managed stallions. Azteca stallions and geldings measure between at the withers, while mares stand between . Mares stand high and weigh , while stallions and geldings stand and weigh or more. The weight range for Campolina stallions and geldings is and for mares. Mares and geldings may be black, bay, brown, grey or roan. Spanish custom also called for mounted troops to ride stallions, never mares or geldings. A typical Mongolian herd consists of 15 - 50 mares and geldings under one stallion. Weight ranges from for geldings and stallions, with no set standard for mares. Under New Forest regulations, mares and geldings may be of any breed. Orlov was very protective of his bloodstock, and would sell only geldings (castrated stallions).