Its not directly related as far as archaeology, but a useful article with likely other good references is:


Pig Pens, Hog Houses, and Manure Pits: A Century of Change in Hog Production.  Chris Mayda, Material Culture, the Journal of the Pioneer America Society, Spring 2004, Vol. 36, No. 1, pp.18-42.


Admittedly I haven't been a member for a while but I found it a very pleasant, useful organization with a small but diverse, friendly, and intelligent membership. Their website is: http://www.pioneeramerica.org/


Harding Polk II
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-----Original Message-----
From: Candace Ehringer <[log in to unmask]>
To: HISTARCH <[log in to unmask]>
Sent: Tue, Jun 25, 2013 6:36 pm
Subject: Hog Farms


I have a colleague who has documented the archaeological remains of a
mid-20th century hog farm in Southern California (LA County). She is
curious to know if anyone else has come across a hog farm recorded as an
archaeological site (particularly in California)? She is currently trying
to evaluate the site for the National Register, but so far has not come up
with anything comparable. If anyone has an example or literature to point
us towards, would be greatly appreciated.

-- 
"Everyone thinks of changing the world, but no one thinks of changing
himself." -- Leo Tolstoy