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INCOMMEASURABLE - Referring to two or more characteristics that cannot be classified with the same scale or unit (e.g., amount of feed consumed and speed of locomotion). I09315. |
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INCOORDINATION - Insufficient synchronization of motor activity of muscles causing incoherent locomotion and reduced body balance. I09317. |
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INDECISION - Inability to choose a course of action or select between alternatives I09319. |
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INDIVIDUAL DISTANCE - The distance an individual seeks to maintain between itself and other individuals, I09405. |
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INDIVIDUAL DISTANCE ZONE - An area surrounding an individual defined by the distance the individual seeks to maintain between itself and other individuals. The size of this zone depends on circumstances existing at a given time, e.g., reproductive stage, social status, temperature. This term generally is used in the context of conspecific social interactions. Compare: Group Distance Zone. I09406. |
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INDIVIDUALITY - A set of characteristics or qualities that distinguishes any given organism from its peers. I09407. |
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INDUCED MOLTING - See Controlled Molting. I09408. |
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INERTIA - A tendency to persist in a state of rest or equilibrium. With regard to the nervous system this tern denotes the time lag between a stimulus and he onset of a detectable response. I09410. |
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INFANTICIDE - Killing of young by a conspecific adult Compare: Infantophagia. I09411. |
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INFANTILE BEHAVIOR - Behavior of neonatal animals during the stage when hey are fully dependent on parental care. I09412. |
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INFANTILISM - Stalled or regressed psychophysiological development of an organism to the degree that it psychologically and behaviorally approximates an infant. I09413. |
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INFANTOPHAGIA - Eating of young by a conspecific adult. Compare infanticide. I09414. |
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INFESTATION - Occurrence of large numbers of parasites within or on an organism. I09417. |
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IN FOAL (horse) - Referring to a pregnant mare (colloquial term). I09502. |
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INGESTIVE BEHAVIOR - Actions by which an organism takes substances into the body by swallowing. I09504. |
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INHALATION - Inspiration of air together with an airborn substance such as medicine. Antonym: Exhalation. I09505. |
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INHIBITION - Partial or complete suppression of a response in the presence of an eliciting stimulus. Also see specific inhibition - AFFERENT; ASSOCIATIVE; CONDITIONED; EXTERNAL; MEMORY; REACTIVE; REINFORCEMENT; RETROACTIVE. I09508. |
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INITIATOR - An individual who incites imitative responses by other members f its group. I09509. |
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INJURY, SPREADER - See Spreader Injury. I09510. |
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IN MILK - Lactating. (colloquial term) I09511. |
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INSEMINATION - Transfer of semen into the reproductive tract of a female. Also see specific insemination - ARTIFICIAL; NATURAL I09517. |
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INSOMNIA - Extended inability to sleep. I09520. |
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INSPIRATION - A segment of the respiration cycle, characterized by expansion of the chest and lungs causing air intake. I09521. |
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INSTIGATOR - In a social context, an organism that initiates some action with regard to another organism (e.g., an animal instigating a fight). I09522. |
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INSTINCT - An unlearned tendency to act in ways typical of a species. I09601. |
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INSTINCTIVE BEHAVIOR - Any response that does not require a learning experience (frequently used synonymously with innate or inherited behavior). I09602. |
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INTEGUMENTARY - Pertaining to the skin or its layers and accessory structures such as hair, horns, hooves, and skin glands. I09607. |
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INTEGUMENTARY BEHAVIOR - Behavior directed toward the integument of the organism (e.g., grooming). I09608. |
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INTENSITY - The quantitative aspect of a stimulus, sensation, or response I09610. |
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INTENTION - Cognitive determination to perform a given action. I09611. |
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INTENTIONAL BEHAVIOR - Behavior directed toward a goal. I09612. |
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INTENTION MOVEMENT - An action that indicates the behavior in which an animal is about to engage. Frequently, such movements are merely preparatory to the subsequent behavior, or they may be the initial actions themselves. In conflict situations, an animal may display intention movements but not follow through with the behavior the intention movements suggest In such cases, the movements may indicate which motivations are in conflict. I09613. |
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INTERFERENCE - A phenomenon in which an organism interrupts an aggressive encounter (threat or fight) among other organisms. Interference is most common in gregarious species. Compare : incitement I09616. |
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INTERIM ACTIVITIES - Behavioral actions that are induced by application of an intermittent reinforcement schedule and are displayed during the period between intervals of reinforcement. I09617. |
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INTRINSIC BEHAVIOR - Behavior that is mediated apparently by specific response mechanisms and is performed with minimal plasticity (e.g., eye blinking). I09715. |
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INTROMISSION - Insertion or admission into something. In a biological context, the term is most commonly used in reference to insertion of the penis into the vagina. I09717. |
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INVESIGATIVE BEHAVIOR - Behavior of an organism indicative of inspection of an object or surroundings. I09803. |
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INVOLUNTARY BEHAVIOR - Any action that occurs without intention or volition (e.g., attention to an unexpected object). I09805. |
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IRIS - A disc-shaped, pigmented membrane with a circular opening in its center (pupil) located in the anterior portion of the eye in front of the lens. By contracting or dilating, the iris can change the size of the pupil and control the amount of light entering the eye. I09807. |
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IRRITABILITY - Ability to respond to stimulation. This term is used frequently to denote oversensitivity to stimulation. I09810. |
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ITCH - An irritating sensation that arouses motivation to scratch, rub, or bite the affected area of the body. A clinical level of itching may result from conditions caused by external parasites (e.g., mange, lice) or internal disorders
(scrapie, Aujeszky's disease). I09813. |
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JENNY - A female ass. J09901. |
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JERKING, HEAD - See Head Jerking. J09902. |
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JIBBLING (horse) - To balk at or defer a required action. J09903. |
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JOINTS, HYPERMOBILITY - See Hypermobility of Joints. J09904. |
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JUMP - To spring from the ground or surface with the propulsive force being derived primarily from the action of the legs. J09905. |
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JUMPER (horse) - A horse trained, exhibited, or competing in jumping events. Jumpers are judged according to faults, such as knock-downs, touches, falls, refusals, run-outs, loss of gait or circling, and time penalties. J09906. |
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JUVENILE TEAT SUCKING - Habitual teat sucking occurring among juvenile, group-housed animals. Juvenile teat sucking can cause inflammation, abscesses, or stricture of the teat canals and subsequent inability to eject milk after parturition. J09910. |
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KAINISM - Killing and eating of sibs. Compare: Fratricide. K09911. |
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KASPAR-HAUSER ANIMAL - An animal that manifests behavioral abnormalities because of having been kept isolated for an extended period of time in an environment of very low complexity. K09913. |
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KEY STIMULUS - A stimulus that, in a given situation, plays a predominant role in elicitation of behavior or behavioral sequences. K09914. |
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KICKING - The act of delivering a powerful blow with one or both hind legs (e.g..by a horse). Habitual kicking is considered a dangerous vice, especially if directed toward humans or other animals. Also see specific kicking - STALL K10001. |
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KID - A young goat up to one year of age. K10002. |
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KIDDING - Parturition in goats. K10003. |
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KINESIOLOGY - Study of different types of muscles, muscle-leverage systems, and muscle movement. K10005. |
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KINESIS - Movement. K10006. |
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KINKY-BACK (poultry) - Postural adjustment in chickens caused by deformity of the vertebral column. (colloquial term) K10010. |
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KINOPSIS - A phenomenon in which individuals of a group are attracted to other group members by visual perception of their movement. K10011. |
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KLINOKINESIS - Movement in changing direction. K10013. |
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KNOCKING, STALL - See Stall Kicking. K10016. |
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KYPHOSIS - Abnormal ventroflexion of the spine. Kyphosis may he a symptom of abdominal pain, rabies, or tetanus. K10101. |
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LABOR - A period of time during which the fetus(es) is expelled from the body of the mother. Labor may be divided into distinct stages: dilatation, expulsion, and placental. The dilatation stage begins with the onset of regular uterine contractions and ends when the birth canal is completely prepared for passage of the fetus. The expulsion stage starts when the fetus begins to move through the birth canal and ends when it is completely expelled from the mother's body. The placental stage begins at the end of the expulsion stage and ends when the placenta and membranes have been expelled. L10102. |
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LABORING ACTION (horse) - Locomotion performed with or requiring excessive effort. Compare: Free Going. L10103. |
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LACRIMAL REFLEX - Increased production of tears in response to corneal irritation. L10105. |
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LACTATION - The act of secretion of milk or the period of secretion of milk. L10106. |
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LAMB - A young sheep up to one year of age L10110. |
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LAMBING - Parturition in sheep. L10111. |
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LAMENESS - Deviation from normal gaits caused by injury or disease (e.g., foot-and-mouth disease, laminitis, milk lameness, etc.). Lameness can be further subdivided into supportive or suspensory lameness, and sudden, progressive or chronic lameness. Also see specific lameness - CHRONIC; PROGRESSIVE; SUDDEN; SUPPORTIVE; SUSPENSORY. L10112. |
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LANDAU INDEX - A procedure for quantifying a social hierarchy, calculated as the degree of deviation from a linear dominance order. L10201. |
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LATERAL - Pertaining to a position to the side of the median part of a body. L10209. |
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LATERAL GAIT - A gait in which the lateral pairs of legs move at the same time (e.g., pace). L10210. |
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LATERAL RECUMBENCY - Lying characterized by full lateral contact of the body trunk, neck, head, and legs on one side with the ground. The neck, head, and legs are usually extended during lateral recumbency. The frequency of lateral recumbency varies among different species of farm animals and different age groups and may also be influenced by environmental circumstances (e.g., type of ground surface, ambient temperature, time of day). L10211. |
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LAYING, EGG - See Oviposition. L10215. |
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LD CYCLE - A cycle with alternating light and dark periods. LD 16:8 designates 16 hours of light alternating with 8 hours of darkness. LL and DD designate continuous illumination or continuous darkness, respectively. L10216. |
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LEADERSHIP - The ability of an individual to control or direct the behavior of he members of a group. L10301. |
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LEADING LEG - The foreleg in a canter or gallop that is not diagonally synchronized with one of the hind legs and lands last in the gait sequence. In an animal traversing a circle, the leading leg is typically that on the inside of the circle. L10302. |
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LEANING - Partial support of the head or body on some object such as a wall, fence, or animal, achieved by shifting the center of gravity horizontally From a point of balance over the legs. L10303. |
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LEARNED BEHAVIOR - Any action performed as a result of, or influenced by, experience. This does not mean that learning is independent of inheritance, since the ability to collect, memorize, and utilize information for the learning process is influenced by genotype. L10304. |
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LEARNED HELPLESSNESS - A phenomenon that may occur when avoidance or reduction of some aversive stimulation is impossible or extremely difficult for the subject. Learned helplessness is manifested by continued acceptance of such stimulation even when the situation subsequently provides opportunity for an avoidance response. L10306. |
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LEARNED PREFERENCE - Any preference influenced by a conditioning process. L10307. |
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LEARNING - The ontogenic process of attainment and memorization of information. Also see specific learning - INCIDENTAL; INSIGHT; LATENT; MOTOR; OBSERVATIONAL; PERCEPTUAL; PREPROGRAMMED. L10308. |
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LEARNING CURVE - Graphic illustration of changes in an animal' s responsiveness to the learning process, arranged according to consecutive units of practice. L10309. |
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LEARNING DISPOSITION - A theoretical concept referring to propensity of an organism to acquire associations in a given situation. The learning disposition of an organism is determined by genetic makeup, psychological and physical condition, and prior learning. L10310. |
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LEARNING SET - Mental representation of a principle common to a series of learning trials such that, although circumstances may differ between trials, the solution to each is governed by the common principle. An animal is considered to have acquired a learning set when it apprehends the principle. L10312. |
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LEE-BOOT EFFECT - Suppression of initiation of estrous behavior by overcrowding of animals. L10313. |
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LEG DROP (horse) - An action in which a horse rapidly tucks a leg under its body, and lowers itself somewhat toward the quarter with the tucked leg. The leg drop is performed to avoid bites directed at the legs in aggressive social encounters. L10314. |
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LEG LEADING - See Leading Leg. L10401. |
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LEG WEAKNESS SYNDROME - A clinical term for a variety of defects in the structure and function of the legs (e.g., broad hips, narrow lumbar area, hypermobility of joints, abnormal angulation of the foot, etc.). Behavioral symptoms are difficult rising from recumbency, staggering gait, inability to maintain positional balance, extended period of recumbency, and paresis. L10402. |
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LEG YIELDING (horse) - A dressage maneuver in which the axis of the horse's body is maintained at about 30 degrees from the direction of movement. The head of the horse is slightly bent at the poll so that it points even farther from the direction of movement. L10403. |
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LESION - Severe damage or loss of tissue characterized by discontinuity of the tissue's function. L10406. |
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LETHARGY - A state of pronounced drowsiness or loss of desire to act. L10409. |
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LETHISIMULATION - Complete temporary immobilization of an animal, visually approximating its death, induced by a sudden and inescapable exposure to a strong fear causing stimulus. L10410. |
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LEVADE (horse) - A dressage exercise of the Spanish High Riding School in which the horse raises the anterior portion of its body (approx.30 degrees) with its hind legs spread apart and bent at the hocks, and the forelegs folded underneath the chest L10412. |
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LIBIDO - Sexual motivation. The level of libido often is assessed from the reaction time between first detection of a sexual partner and first mounting attempt by the mate or display of receptivity posture by the female. L10414. |
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LICKING - An action whereby the tongue is slid over the surface of an object. Licking may have a nutritional, gustatory, prophylactic, or social function and also may develop as a stereotyped behavior pattern. Licking consists of self-licking (an animal licks its own body) or social licking (an animal licks is sexual licking which occurs predominantly during courtship and estrus. Also see specific licking - SEXUAL; SOCIAL. L10415. |
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LICKING SYNDROME - Excessive occurrence of social licking, assumed to be an indication of sodium deficiency. L10501. |
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LIE - To assume or maintain a recumbent position. The behavior patterns involved in lying down show a high degree of uniformity within species, hut may be modified by environmental circumstances (e.g., restriction of movement, injury). The posture when lying can be categorized as lateral recumbency, semi-lateral recumbency, or ventral or sternal recumbency. The body position of a recumbent animal may reflect health status (e.g., unusual posture to prevent pressure on an injured or inflamed area), level of exhaustion (e.g., selecriveness of place to lie and tendency to adopt lateral recumbency), degree of thermal comfort (e.g., the area of exposed body surface), and level of relaxation (e.g., position of the head, eyelids, or limbs). L10502. |
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LIFT, REAR-LEG (horse) - See Rear-leg Lift. L10505. |
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LIGHT - Radiant energy in the range of frequencies that stimulates visual receptors. L10506. |
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LIGHT REFLEX - Contraction of the pupil when exposed to light. L10508. |
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LIGNOPHAGIA - The eating of wood or wooden substances.Lignophagia is commonly identified as wood gnawing. L10509. |
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LIMITED FEEDING - Any feeding program that provides less feed than the animals would consume ad libitum. Such a program frequently is used to prevent excessive fattening of animals. Synonym: Restricted Feeding. L10513. |
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LIMINAL SENSITIVITY - The lowest level of stimulation that evokes a detectable response. L10511. |
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LIMITED FEEDING - Any feeding program that provides less feed than the animals would consume ad libitum. Such a program frequently is used to prevent excessive fattening of animals. Synonym: Restricted Feeding. L10513. |
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LINE - A group of animals interrelated through an ancestor(s) and possessing some common genetic and phenotypic characteristics. L10514. |
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LINEAR HIERARCHY - A type of social hierarchy formed as a straight rank. The highest ranking animal dominates all, the second highest all but the first, the third highest all but the first two, etc., down to the animal subordinate to all. L10515. |
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LIP-CURLING - A response to pheromones, manifested by inhalation followed by distinct upward curling of the upper lip and dorsiflexion of the neck. Lip-curling is most noticeable in male ungulates when in proximity to estrous also be exhibited by female bovines when close to estrous peers. Synonym: Flehmen. L10604. |
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