", 4 March 2012 (UTC) 
 ::::::::Malick, I'm gonna only tell you one more time: stop trolling my articles. As to your concerns: yes, a ref is given for the guinea pigs, right at the end of the paragraph, as is standard practice for DYK articles. Read the source. And the answer to your question is ""both pigs and guinea pigs"" (the pigs didn't work out and guinea pigs weren't all that good either), which you'd know if you had actually bothered to read the source you link to rather than just trying to find non-existent problems with the article. Here's a clue: go to the source you link to. Press control-F. Type in ""pig"" in the search field. Look at ALL (all 2 of them) mentions of the word pig. 20:24"