Fig. 2

A sPLS-DA analysis for farrowing rates deviation showing sample distribution in component 1 and component 2. Seminal plasma samples from entire ejaculates (24 ejaculates) of eight artificial insemination-boars (three ejaculates per boar) were used. Fertility parameters were recorded from 1525 inseminations. The colored areas represent the 95% confidence interval. Boars classified with positive farrowing rate deviation (ranging from 2.82 to 7.54; n = 4) are represented in red and those with negative farrowing rate deviation (ranging from − 2.80 to − 1.60; n = 4) are shown in blue. Each dot symbolizes an ejaculate. B Loading plot for components 1 and 2 for the sPLS-DA model. Variables are ranked by the absolute values of their loadings. C Receiver operating characteristic (ROC) curve analysis for lactate concentration in seminal plasma and farrowing rate deviation. Seminal plasma samples from entire ejaculates (24 ejaculates) of eight artificial insemination-boars (three ejaculates per boar) were used. Fertility parameters were recorded from 1,525 inseminations. The plot shows the ability of a given metabolite to discriminate farrowing rate of semen doses. AUC: area under the curve; CI: confidence interval