A new study links sewage sludge, used as pasture fertilizer, to stunted testes in fetal lambs. The finding signals a developmental problem that could have consequences in adult male sheep.
Researchers in Scotland treated lamb pastures for 5 years with either conventional inorganic fertilizers or sewage sludge, the nutrient-rich by-product from sewage-treatment plants.
Log in
Subscribers, enter your e-mail address for full access to the Science News archives and digital editions.