Udder: the mammary glands or teats of a female horse. The organ that secretes milk

Umbilical Cord: naval cord. Attaches foal to mother, at the navel, through which nutrients and waste pass between the mare's placenta and the foal

Underline: the length and shape of the line from the elbow to the sheath or udder

Under Saddle: see Saddle Horse

Under Wraps: horse under stout restraint in a race or workout

Unsoundness: a defect that may or may not be seen but that does affect serviceability

Uterus: the organ in which the embryo and fetus develop, also referred to as womb or weathers

Uveitis: inflammation of internal eye

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