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Cows were fed a 28% CP cube at one of two supplement levels, high (HN) or low (LN), while grazing dormant winter range during late gestation to determine the effects of maternal supplementation level on male progeny performance and carcass characteristics. Steer initial BW did not differ between treatments; however, year 1 steers from cows fed higher supplement levels had greater final BW, HCW, marbling scores, and carcass value compared with steers from cows receiving lower supplement levels. Year 2 HN steers had greater proportions grading USDA quality grade modest or greater when compared to steers from both treatments in year 1, but only differed numerically from LN steers from year 2. Steer performance and carcass characteristics were improved in year 1 when dam protein supplementation levelswere increased.