Date of this Version
Records from 1997 through 2009 were used to determine the effect of calving date on ADG, reproduction, and first-calf characteristics in spring born heifer calves at University of Nebraska– Lincoln Gudmundsen Sandhills Laboratory. Heifers were classified as born in the first, second, or third 21- day period of the calving season. Heifer calves born during the first 21 days had greater weaning, pre-breeding, and pre-calving BW; greater percent cycling before breeding, and pregnancy rates compared to heifers born in the third period. First-calf progeny had earlier birth date and greater weaning BW. Calving period of heifer progeny impacts development and first-calf characteristics.