At the beginning of the 20th century, before indoor plumbing became more common, a weekly Saturday night bath had become common custom for most of the population. A tub would be filled by carrying buckets of heated water and the bath water was shared by all family members so the first in line had the cleanest water.
The mother cow doesn’t have to carry water so she can give her calf a cleaning on the go as she licks the calf clean with her tongue.
Saturday Bath Time