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Age-Of-Dam Adjustment Factors For Birth And Weaning Weight Records Of Beef Cattle: A Review, Janice M. Rumpf, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Age-of-dam adjustment factors are used to pre-adjust birth and weaning weight data for national beef cattle genetic evaluations. Adjustments are used in order to make the means of the different age-of-dam subclasses similar so that a fair comparison of animals can be performed. A review was made of various research studies that have estimated age-of-dam adjustment factors for birth weight and weaning weight of beef cattle. In general, birth weight age-of-dam adjustment factors are the same across the sexes, but weaning weight age-of-darn adjustment factors differ across the sexes, with heifer calves receiving smaller adjustments than their male counterparts. Additionally, …