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I believe a weanling is a young horse in the process of weaning or, in other words "beginning stop drinking its mothers milk."
Yes. I'm pretty sure a weanling is a foal under a year old. Double check, though, just to make sure.
Only if that calve has or is being weaned.
A shoat is a weanling pig, that is, a pig that has just been weaned.
Weanling steers and heifers of pretty well any breed can be used for team penning.