Jerry Rosman, a pig farmer in Iowa, was cultivating GMO corn,(Roundup Ready and BT) and fed this corn to his pigs.
Result: his sows became infertile, and then after one year he went bankrupt.
See the whole interview here: http://vimeo.com/20237421
Is it an incident isolated to Iowa ? Check this article from Greenpeace; http://www.greenpeace.org/india/en/news/no-need-for-condoms-ge-corn/
“Austrian scientists fed mice over a course of 20 weeks a mixture of 33 percent Monsanto GE corn (NK 603 x MON 810) and non-GE corn.
These mice gave birth to less babies and lighter babies in their third and fourth litters. Mice fed on non-GE corn had babies as normal.
These differences are statistically significant.”
To have a more global idea on the issue and the relation between GMOs and sterilisation, please read the book “Seeds of Destruction: The Hidden Agenda of Genetic Manipulation”