2.3. Data Treatment and Statistical Analysis

The data for the milk composition of the goats was recorded at each lactation stage and analyzed according to the repeated measures procedure using IBM SPSS Statistics for Windows (version 26.0; IBM Corp., Armonk, NY, USA). The model included the fixed between-subjects factors of dietary treatment (CD, DOP40, or DOP80) and prolificacy (single or double birth) and the fixed within-subjects factor of lactation stage (repeated measures), as well as the interactions between these factors. For simplification, the results for the factor prolificacy have not been presented in this paper. Tukey’s Honest Significant Difference (HSD) test was used for pairwise means comparisons. Finally, Pearson correlation coefficients were calculated for some of the variables used.