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Nuclear morphology of Norwegian Duroc (ND) and Norwegian Landrace (NL) oocytes. Chromatin configuration of oocytes was classified in the categories; germinal vesicle stage 0 (GV0), 1 (GV1), 2 (GV2), 3 (GV3), 4 (GV4), metaphase I (MI), anaphase/telophase (A/T), metaphase II (MII) or degenerated (D). A) Oocytes at 20 hr of maturation (114 ND and 109 NL oocytes). B) Maturation rate to MII at 48 hr (151 ND and 162 NL oocytes). * p < 0.01; *** p < 0.0001
