1. rhesus factor-a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia. Rh, Rh factor.. rhesus factor-a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia. Rh, Rh factor.
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Brief Description. Cribbing is one of several âstereotypiesâ or seemingly functionless, repetitive behaviors that also include weaving, stall-walking, pawing and head bobbing. Wood chewing, although related to cribbing and much more common, appears to be a normal behavior in horses that may be seeking more long-stem forage or âchew time.â. Cribbing is different from wood chewing.