Jerry Rosman, a pig farmer in Iowa, was cultivating GM corn (Roundup Ready and Bt), which he fed to his pigs. Result: his sows became infertile, and then after one year he went bankrupt. (Time: 1:05:25)
This confirms a study by the Austrian government showing that feeding mice exclusively on GM corn caused infertility: http://www.greenpeace.org/india/news/no-need-for-condoms-ge-corn