IPA: /ˈsʌk.lər/
KK: /ˈsʌk.lɚ/
A young mammal that feeds on its mother's milk, especially one that has not yet been weaned.
The farmer watched as the suckler calf followed its mother around the field.
Suckler → The word is formed from "suck" (from Old English "sūcan", meaning to draw in or suck) and "-ler" (a suffix indicating a person who performs an action). A suckler is a person or animal that suckles, typically referring to a mother feeding her young by drawing milk.
Think of someone who 'draws in' ('suck') nourishment for their young — that's what a suckler does.