The Agricultural Research Service of the U.S. Department of Agriculture has conducted a study showing that wastewater from large dairy farms is very high in estrogens which can persist for months, or even years. The levels found by the study are high enough to lower the sperm counts of fish living in the water, and cause them to develop female characteristics.

The Agricultural Research Service of the U.S. Department of Agriculture has conducted a study showing that wastewater from large dairy farms is very high in estrogens which can persist for months, or even years. The levels found by the study are high enough to lower the sperm counts of fish living in the water, and cause them to develop female characteristics.