JOHN LEWIS-STEMPEL: As crimes go, it took balls. Just before Christmas, thieves stole 60 containers of bull sperm from a farm in Olfen, a small town near Cologne, Germany. You might wonder what you do with litres of bovine ejaculate. Well, bull semen from premium pedigree bulls can be worth its weight in gold. Literally. … Continue reading ‘White Gold’: The sickening cruelty behind the bull semen trade