“Where did the piglets study their ABC’s?”/“At a school for higher loining.”

A piglet riddle is:
 
Q: Where did the piglets study their ABC’s?
A: At a school for higher loining.
 
The “higher loining”/“higher learning” pun has been cited in print since at least 2007.
 
           
funnyjoke.com.au
Category: Pig jokes
Date Added: 10/10/2007
Rating: not yet rated  
Joke: Where did the piglets study their ABCs? At a school for higher loinin
 
Laughter Dose
Where did the piglets study their ABC’s?
March 10, 2008
Where did the piglets study their ABC’s? At a school for higher loining.
 
Twitter
Marley The Dog
@marleyterrier
#hamfest Q: Where did the piglets study their ABC s? A: At a school for higher loining
9:19 AM - 21 Jul 2009
 
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
Where did the piglets study their ABC’s? At a school for higher loining.
   
Twitter
Minerva Dickins
@poduraeva1
Where did the piglets study their ABC’s? At a school for higher loining.
3:47 AM - 26 Mar 2015
 
Twitter
Lucky Score
@LuckyScoreNet
Where did the piglets study their ABC’s?
At a
school for higher loining.
#Joke from #PigJokes in #Jokes, #Humor and #Satire
12:06 PM - 22 Mar 2018