(Hillsboro, OR)  --  An Oregon man will serve 20 months in prison for sexually abusing a horse.  Court documents show 21-year-old Kenneth Duyck broke into the Forest Grove Storage Lot and raped a mare in April of last year.  The barn owner discovered the crime when she noticed the horse's strange ties and an unknown fluid.  She recalled a man had asked to sleep on her property the day before, which led to Duyck.  Duyck, who suffers from mental illness, must also register as a sex offender and is banned from owning any domestic animals for 15 years.