Sir, who says the kitnios in the farm wasn’t mixed in with the wheat feed? The issur of owning might be a kezayis, but when a person feeds an aninal, it’s called hanaah according to halacha. I don’t believe there is a minimum for how much chometz one can benefit from; it shouldn’t be any different than having hanaah from other issurim, like basar vechalav, which has no shiur.
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