*5.5. Statistical Analysis*

Firstly, the normality of distributions for studied traits was tested using the Shapiro–Wilk normality test [50]. One-way analysis of variance (ANOVA) was carried out to determine the effects of cereal composition on the variability of ergosterol (ERG), and mycotoxins: zearalenone (ZEN), deoxynivalenol (DON), nivalenol (NIV), and fumonisin B1 (FB1), independently for cat and dog food samples. Minimal, maximal and mean values of individual traits were calculated. The Fisher's least significant differences (LSDs) were calculated for individual characteristics and on this basis homogeneous groups were determined. The relationships between the ERG, FB1, ZEN, DON, and NIV were determined using the simple correlation analysis. Relationships of five observed traits were presented in Table 4. Data analysis was performed with the GenStat 18 package software for cat and dog food samples independently.

**Author Contributions:** N.W., Ł.S. and A.W. conceived and designed the experiments; N.W. performed the experiments; N.W., Ł.S. and A.W. analyzed the data; J.B. performed statistical analyses; N.W., Ł.S., and A.W. wrote the paper. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Conflicts of Interest:** The authors declare no conflict of interest.
