One of the Professors at our local University had some oil from the Tyson chicken processing plant. Two things I remember about it is that it titrated at a 7. (This means it takes 12grams of KOH per liter, base of 5 plus 7 for the titration) Also the biodiesel made from this oil had a real orange color. This was possibly from the beta carotene in the chicken feed.
If I get WVO that titrates 5 or over, I don't use it. It gets real expensive to process plus it is just plain crappy oil. (To much FFA, free fatty acids)