He is basically saying that the pig pen stinks and won't go near it (without a mask, to be more precise).
「よれん」means in this case not to go near the pig pen. It does not mean 'not to get twisted'. When referring to the mask, he just means that a mask would be able to get him near a pig pen.
In this instance 「おらあ」means, he is talking about himself.
I should also point out that this type of talk would be from an older man or the story that it came from is rather old, as no one here in Kansai really speaks like this any more.
If you were to say the same thing in the Kansai area (More specifically Wakayama and south Osaka) nowadays it would go something like this.
ahh, this stinks... There is no way I could go near a pig pen
without a mask.
Same sentence in what Kantou region would say.