Q and A on Fly Resistance

Question: “In regards to fly resistance… since flies are attracted to testosterone, how do you ensure that in selecting for fly resistance in your bulls you are not inadvertently selecting low testosterone bulls?”

Answer: Good question. Several things come to mind. 1) How much testosterone is enough? Nearly all men with extra high levels of testosterone are behind bars. 2) We are evaluating and scoring young bulls. As bulls age, testosterone levels increase. 3) We have been at this long enough to know that bulls with good fly resistance scores can breed a lot of cows for many years.

Q and A – Fly Resistance and Testosterone

Q and A –
By Kit Pharo
Kit@PharoCattle.com

Question: “In regards to fly resistance… since flies are attracted to testosterone, how do you ensure that in selecting for fly resistance in your bulls you are not inadvertently selecting low testosterone bulls?”

Answer: Good question. Several things come to mind. 1) How much testosterone is enough? Nearly all men with extra high levels of testosterone are behind bars. 2) We are evaluating and scoring young bulls. As bulls age, testosterone levels increase. 3) We have been at this long enough to know that bulls with good fly resistance scores can breed a lot of cows for many years.

Fly Control

The hottest topic within the beef industry right now is fly control. When confronted with a problem, most producers are quick to spend an inordinate amount of time, energy and money treating the symptoms – while they totally ignore the problem. Folks, if we never work at solving the problem, we will never get rid of the problem – and it will continue to get worse.

I have always believed many of the problems we encounter in the cow-calf business have a genetic factor. Genetic selection, though quite slow,