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Seasonal variations in plasma anti-Müllerian hormone (AMH) and vitamin D3 (VD3) concentrations in Japanese Black cattle. Plasma AMH concentrations in cows from Farm A (A) and heifers from Farm B (B) were measured using the AMH Gen II and Bovine AMH ELISA kits, respectively. For Farm B, plasma VD3 concentrations were measured in randomly selected heifers. * P < 0.05 and *** P < 0.001.
