Additional file 1:

Correlation between results of the Wood model applied to lactations of different length. The Wood model was fitted to observed lactation data, truncated at days 50, 80, 100, 150, 200, 250 and 300. The correlation between the cumulative yield using lactations of 100 days length (x-axis) is plotted against predicted cumulative yield of lactation length shorter (50 and 80) and longer (150, 200, 250, 300, and 400 days) than 100 days (y-axis).

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Additional file 2:

Summary of QTL for lactation traits using QTL Express single QTL models. Shown are the QTL relative QTL position and the confidence interval (CI) along the ¹male distance map [27] for the following traits: protein (PP), fat (FP), lactose (LP) and useful yield (UP) content, total milk (YCUM), protein (PYCUM), fat (FYCUM), and lactose (LYCUM) yield until day 100, total somatic cell count (YSCC) and total cell score (YSCS) until day 100; the F-value and; ²significant threshold of the F-value (Sign.) which determines if the QTL reached the significance level with *chromosome-wide P < 0.05; **chromosome-wide P < 0.01; ***experiment-wide P < 0.05; ****experiment-wide P < 0.01; ³QTL heritability: proportion of the phenotypic variance accounted for by the QTL [1-(MS of full model/MS of reduced model)].

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