The end of the feather shaft


The colors that are used to mark a ram’s chest that rubs off on ewes once they have mated

radiation therapy

A treatment of certain neoplasms that is administered using an x ray


A medical condition in which the nerves of the spine are inflamed


A record of body structures using an x-ray


A procedure of imaging internal body structures by exposing film


A person who specializes in the imaging of internal body structures after exposing them to ionized radiation


The study of the internal structures of the body as pertaining to ionizing radiation


Refers to something that appears black or gray when observed on a radiograph


Something that appears white or light grey on a radiograph

ram jacket

A jacket that is designed to prevent a ram from mating while still allowing it to run with the flock

ram lamb

A sheep (male) less than one year old

random mating

A mating system in which males and females have an equal chance of mating with one another

random sample

A sample taken from an area without particular regard to from who, so every living thing in that group has the same chance of being part of that sample


The term for an animal who lacks real muscular structure, very lean and leggy in appearance


A calf that is of very poor quality


The term used to refer to animals that scratch the ground

ration of maintenance

The amount of feed needed to sustain an animal


A female that is constantly in heat for some reason or another


The skin of cattle that has not been dressed

rawhide quirt

A whip that is made of rawhide


Any type of substance that is involved in a chemical reaction


The term for a trait that is overshadowed by a gene that is more dominant in nature


To bring something back to its original form by adding water


Anything having to do with the rectum

rectal palpation

A way of determining pregnancy by inserting an arm into the rectum and feeling for the young


Pertaining to the rectum and vagina


Tail feathers used in flight


The very end of the large intestine


The position of lying down

red cell count

The number of erythrocytes detected in every cubic millimeter of blood


Returning food that has been swallowed into the mouth; often results in vomiting


The return of food into the oral cavity after it has been swallowed


To control a horse with the reins; this includes stopping, directing, and guiding them


The act of repeating the act of insemination


A type of hormone that is produced at the time of birth; it is thought to provide assistance with relaxing of the birth canal during labor


The disappearance of the signs and symptoms of a particular disease; this is often used in association with cancer


A horse that is used to replace a horse that has been worn out or otherwise incapacitated


A collection of horses that have been broken


Anything having to do with the kidneys

renal failure

The failure of the kidneys to perform their proper functions

renal infarction

A decrease in the amount of blood flowing to the kidneys

replacement animal

An animal that is raised to replace an older animal in a herd


The act of bearing fruit or bringing forth young

respiratory rate

The number of respirations per minute; one respiration equals an inhalation and exhalation

responsive mouth

A horse that is trained to obey the reins

rest-rotation grazing

A system of grazing in which parts of the range are used for grazing while others parts of the range are rested

rested pasture

A pasture that remains ungrazed for the span of the whole growing season

restricted feeding

A feeding system in which food is only provided at certain points throughout the day


The restoration of life

retained placenta

A medical condition in which the mother animal fails to expel the placenta

retained teeth

The term for deciduous teeth that fail to fall out when they should

retaining pen

A pen that is designed for holding cattle and other animals when dipping, weighing, shearing, or anything else of that nature is taking place


The cranial portion of the fore stomach in ruminant animals; is often called the honeycomb due to its texture


The layer of the eye that is charged with receiving and processing images

ross test

A test of urine that is used to determine the presence of ketone and acetonemia in domestic animals


The end of the head containing the nose


A type of decay that is caused by fungus or bacteria

rotated pasture

A pasture in a system of crop rotation that is grazed and then plowed to make room for other crops

rotation grazing

A system of grazing in which pastures are rotated to allow for appropriate recovery

rough coat

An animal’s coat that indicates lack of proper care by looking or being coarse or tangled


A type of animal feed that is high in fiber; may include hay or pasture crops


An unsegmented parasitic worm belonging to the Nematoda class


In equine terms, the wheel of points found on a spur

rubber sleeve

A type of long, protective sleeve and glove that is used to cover the arms during insemination or other work that requires such protection


Any type of substance that causes the skin to be red when it comes into contact with it


Not fully developed

rudimentary teat

A teat that is not fully developed and so may not be connected with the tissue responsible for the secretion of milk


A branch of study involving the processes of the rumen


The act of cutting into the rumen to make an observation or to remove something


An animal with a fore stomach that chews its cud


The act of chewing the cud


A series of functions pertaining to the digestive processes of ruminant animals


The rear end of an animal

run free

To be loose and unrestricted


An animal that is born smaller than its siblings and is not used for breeding; this may be due to genetics

rutting season

The season in which animals are in heat