This is a major problem as more farms are absorbed into single units. Milk overproduction is ruining the natural diversity of the countryside and rivers. Land that is used for slurry disposal is now sterile except for grass, no other other organism can tolerate the ammonia and many other poisons. The milk is now also contaminated with antibiotics, hormones and veterinary medicines, this a human health disaster in the making. This has occurred due to the full year containment of cattle in sheds and the negative health issues caused by this.