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Lüttgenau, J; Mang, H; Borel, N; Bruckmaier, Rupert; Bollwein, H (2016). Ultrasonographic examination reduces the percentage of unsuccessful inseminations in dairy cows. Theriogenology, 85(4), pp. 664-670. Elsevier 10.1016/j.theriogenology.2015.10.004
