Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist — For years, the accepted target weight for yearling replacement beef heifers at breeding was 65% of their mature weight. Recently that target has been questioned. Oklahoma State University reproductive physiologists have studied the weight that beef heifers reach puberty in relationship to their eventual mature weight. A total of 34 crossbred heifers (in 3 different years) were studied at puberty and again when they had reached maturity at 5 to 7 years of age.


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