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M. BOVIS, REPEAT OFFENDER

If that was me, I’d be quick to cut my hair short, dye it gray, grow a distracting moustache and change my clothes. That’d throw the heat off for a while. The “known associates” part may be a bit harder to manage.

Mycoplasma bovis behaves similarly. Like all pathogens, M. bovis “wears” distinctive antigen proteins on its cell surface. When the animal’s immune system recognizes those antigens as potentially dangerous, it circulates the suspect’s description and recruits antibodies to apprehend it. But M. bovis is trickier than most microbes. It can switch which antigens it displays – it can change its clothes. This delays the immune system from recognizing it and allows M. bovis to continue its crime spree throughout the animal, potentially resulting in chronic pneumonia and arthritis.

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Episode 95: Growth Promotants and the Environment Revisited

Video: Episode 95: Growth Promotants and the Environment Revisited

Past research has measured how long residues from growth promoters stay around in a feedlot environment. It showed that certain ones dissipated very quickly, while some could still be found on the pen floor for up to five months after they were last fed. In this episode, we will hear results from a follow-up study that looked at whether composting manure, stockpiling it, or incorporating it into the soil might help to break down these residues.