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Association between BLV infection and milk yield. Average daily milk yield (A–I) for each of three lactation numbers (2, 3, and 4) and stages (early, middle, and late) were compared between the intervention (in black) and control (in white) groups by Student's t-test. Data are shown as mean ± SD, and the symbols indicate P ≤ 0.001 (***), P ≤ 0.050 (*), and P > 0.050 (ns), respectively.
