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No differences were observed between AI- and natural service-sired females based on pregnancy status at first and second pregnancy diagnosis (P 0.05). Sire type was only found to be significant for age at first calving (P 0.05) but was significant for age at first calving (P less then 0.05). These data suggested that lighter heifers calved earlier which contradicts our original hypothesis. Overall, commercial Angus females sired by AI or natural service bulls had similar reproductive performance. Factors that were commonly associat
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