**5.6 Comparison of grooming frequency during light/dark transition box test among the different experimental groups**

The mean ± SEM grooming frequency for the control, CdCl2 (14 days), CdCl2 (28 days), CdCl2 + Zinc, and CdCl2 + Vitamin E groups were 1.80 ± 0.37, 7.20 ± 0.86, 9.33 ± 0.38, 2.60 ± 1.08, and 4.20 ± 0.58 respectively.

The findings revealed that the CdCl2 group's grooming frequency was substantially higher (p < 0.05) than that of the control group. However, when compared to the CdCl2 group, the grooming frequency in the CdCl2 + Zinc group was considerably lower (p < 0.05) (see **Table 2**).
