Steroids for cattle — causing sex changes in fish?

A hormone used to raise beef cattle may be staying in the environment longer than previously believed and changing the sex of fish, among other effects.
101374915-186501746.530x298 Steroids for cattle -- causing sex changes in fish?
A team of American researchers says the information regulators are using to govern the use of the chemicals in livestock farming is faulty, and the way in which all chemical substances are regulated needs an update. The team published its results in the journal Nature Communications last week.

“It is an example where we don’t know as much as we thought, and that means there are consequences we didn’t expect,” said lead author Adam Ward of Indiana University.

Chase Adams, a spokesman for the National Cattleman’s Beef Association, said he was unable to immediately locate anyone able to respond to the findings.

Trenbolone acetate (TBA) is a potent hormone—many times stronger than testosterone. It is an “androgen”—a steroidal hormone that’s sometimes used as a performance-enhancing drug by athletes. Though human use of trenbolone is illegal, discussions about it can be found on places such as online bodybuilding forums. It can also be found in the bodies of cows across America.
Steroids for cattle causing sex changes in fish