UDDER - The mammary gland of females in some mammalian species. U19101. Definition from Hurnik et al., 1995.

ULCER - Any long lasting breach in the skin or in the membrane of the body cavity. U19102. Definition from Hurnik et al., 1995.

UNCONSCIOUS BEHAVIOR - Any behavioral action wherein the organism is aware of neither its performance nor its causation or function at the time of performing the action. This term is often inappropriately used for behaviors guided by subconscious (extraconscious) processes. U19109. Definition from Hurnik et al., 1995.

UNCONSCIOUS PROCESS - A process that is inaccessible to the conscious mind. U19110. Definition from Hurnik et al., 1995.

UNTAME - Referring to an animal that has not been familiarized with humans and thus is intractable, producing avoidance or aggressive responses in the presence of people. U19117. Definition from Hurnik et al., 1995.

UPSIDE-DOWN PRESENTATION - Fetal presentation in which the forelegs and the nose enter the birth canal while the dorsal part of the body of the fetus is oriented ventrally. U19119. Definition from Hurnik et al., 1995.

URINATION - Discharge of urine from the body. Animals, particularly male horses, spread apart their hindlegs and remain stationary during urination. Bovine males and boars may occasionally urinate while walking. Swine end to urinate in wet areas of the pen. Synonym: Micturition. U19203. Definition from Hurnik et al., 1995.

URINE SAMPLING - Nasal contact by males with the urine of urinating Females, usually Followed by lip curling. Urine sampling is most common in bovines. U19204. Definition from Hurnik et al., 1995.

UTERINE PROLAPSE - Partial eversion of the uterus from the vulva. Uterine prolapse occurs frequently in hens, more often in cattle than in horses, and very rarely in pigs. U19210. Definition from Hurnik et al., 1995.

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Revised: April 18, 2008