R

Ralgro® - Growth implant containing zeranol (a fermentation product exhibiting estrogenic activity).

random mating - System of mating whereby every female (cow and/or heifer) has an equal or random chance of being assigned to any bull used for breeding in a particular breeding season.  Random mating is required for accurate progeny tests.

ration - Feed fed to an animal during a 24-hour period.

REA - See rib-eye area (REA).

reach - See selection differential.

realizer - Feedlot animal that is removed before the end of the feeding program.  Only part of the animal's potential value is realized because of disease, injury, or the like.

recessive gene - A gene that has its phenotypic expression masked by its dominant allele when the two genes are present together in an individual.

rectal prolapse - Protrusion of part of the large intestine through the anus.

red meat - Meat from cattle, sheep, swine, and goats.  See also white meat.

reference sire - Bull designated to be used as a benchmark in progeny testing other bulls (young sires).  Progeny by reference sires in several herds enables comparisons to be made between bulls not producing progeny in the same herd(s).

registered - Recorded in the herdbook of a breed.

regurgitate - To cast up undigested food to the mouth as is done by ruminants.

replacement heifers - Heifers, usually between 6 months and 16 months of age that have been selected to replace cows in the breeding herd.

replacements - Cattle that are going into feedlots or breeding herds to replace those being sold or that have died.  See also replacement heifers.

reproductive tract score - Numerical score based on palpation of the heifer's reproductive tract (1 = not cycling; 5 = heifer cycling).

resource - Input or factor used in production, such as cattle, labor, or land.

retail cuts - Cuts of beef in sizes that are purchased by the consumer.

retained ownership - Usually refers to cow-calf producers maintaining ownership of their cattle through the feedlot.

retained placenta - Fetal membranes (afterbirth) are not expelled through the reproductive tract in the normal length of time following calving.

reticulum - One of the stomach components of cattle that is lined with small compartments giving a honeycomb appearance.

rib-eye area (REA) - Area of the longissimus dorsi muscle, measured in square inches, between the twelfth and thirteenth ribs.  Also referred to as the loin-eye area.

rib-eye area per cwt carcass wt - Rib-eye area divided by carcass weight.

risk - Possibility of suffering economic loss.  Sources of risk include climate, disease, and changes in the marketplace.

risk management - Managing risks in ways that allow a desired outcome to be achieved.

rotational crossbreeding - Systems of crossing two or more breeds whereby the crossbred females are bred to bulls of the breed contributing the least genes to the females' genotype.

roughage - Feed that is high in fiber, low in digestible nutrients, and low in energy (e.g., hay, straw, silage, and pasture).

rugged - Big and strong in appearance; usually heavy boned.

rumen - A compartment of the ruminant stomach that is similar to a large fermentation pouch where bacteria and protozoa break down fibrous plant material swallowed by the animal.  Sometimes referred to as the paunch.

ruminant - Mammal whose stomach has four parts--rumen, reticulum, omasum, and abomasum.  Cattle, sheep, goats, deer, and elk are ruminants.

rumination - Regurgitation of undigested food that is chewed and then swallowed again.

NCBA is on Capitol Hill...

...taking care of our needs while we are out in the fields
taking care of our animals and our land.

-Tony Turri - California