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Influence of the melatonin application on the Dairy Herd Improvement (DHI). (A) Somatic cell score, (B) milk yield, (C) protein content, (D) lactose content, (E) fat content, (F) dry matter content and (G) urea nitrogen content. All data are represented by the mean ± standard error, * p < 0.05, ** p < 0.01, n = 328. MT: melatonin.
