On my February 4th entry, I commented on an article about genetically modifying bulls to create an endless supply of semen from “superior” sires. This same article also specifically reasoned that heat tolerant bulls could be modified to make them more fertile. Basically, young, healthy bulls would be sterilized then spermatogonial stem cells, from highly fertile bulls, would be transplanted in them. I ended my entry by asking if cattlemen were even asking for this service.

I don’t run in the same circles as laboratory cattlemen, so I don’t have an answer to my question. I did, however, read an article in a cattlemen’s publication that was quite the opposite stance. It seems that a Texas rancher has a breeding objective of “maintaining a breed herd…of appropriate genetics for the region”. He utilizes bulls that are “smaller in frame size and had EPDs for low birth weight and maintenance energy”. This rancher also says that “selection is applied to promote high fertility and survival in a low input system”.

This I can side with. I would rather invest my dollars and time in stock that can make the grade on their own, not in cattle that have to be modified to be productive. What are your thoughts? Comment at redangus@sheribryan.com.