Health Concerns
In order to be incorporated into the studbook, stallions and mares must pass rigorous testing. The goal of this testing is to prevent horses with heritable defects from continuing to pass on their genes. As a result, horses with the Hanoverian brand often have excellent health. The Hanoverian verband, and other warmblood breeding societies, continue to promote research into the health of their horses.
Poor fertility in Hanoverian stallions and mares is not very common. However, research on Hanoverian stallions has helped lead to the identification of new genes that affect stallion fertility.
Osteochondrosis is a disease that affects the bone and cartilage in the joints of growing horses. The joints most commonly affected are the fetlocks in the fore- and hind leg, and the hock and stifle of the hind leg. Osteochondrosis lesions include tiny fractures, fluid buildup, loose flaps of cartilage, or chips of cartilage loose within the joint. The last lesion is called osteochondrosis dissecans (OCD), and can develop further into degenerative joint disease, such as osteoarthrosis. Osteochondrosis can also contribute to navicular syndrome and Wobbler disease. Because most horses, especially Hanoverians, which are often used for demanding equestrian sports, work for a living, joint discomfort can mean the end of a horse's career. Between 7% and 10% of Hanoverians have OCD in the hock joint, and between 12% and 24% have OCD in a fetlock joint.
Recent research has tagged certain conformational characteristics and other heritable factors of bone growth and maintenance as the most important contributors to the development of osteochondrosis. The Hanoverian Breeder's Society in Germany, and all its daughter societies, mandate that stallions must be free of OCD lesions in order to be issued a breeding license. Elite mares and Verband-sponsored auction candidates have identical requirements. Horses are examined with radiographs.
Read more about this topic: Hanoverian Horse
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