- < ?dbfo label-width="0.25in"?>
In discussions about the dangers of increasing the prevalence of antibiotic-resistant bacteria by treating farm animals with antibotics, it’s a common (and understandable) misconception that antibiotics serve the same purpose with animals as for people: to prevent disease. In fact, antibiotics serve mainly as a way to increase animal growth. We know that this arises from the effect on bacteria (and not, say, by the effect of the antibiotic molecule on the animal’s cells), but it is not because antibiotics are reducing visible illness among animals:
Studies conducted in germ free animals have shown that the actions of these AGP [antimicrobial growth promoters] substances are mediated through their antibacterial activity. There are four hypotheses to explain their effect (Butaye et al., 2003). These include: 1) antibiotics decrease the toxins produced by the bacteria; 2) nutrients may be protected against bacterial destruction; 3) increase in the absorption of nutrients due to a thinning of the intestinal wall; and 4) reduction in the incidence of sub clinical infections. However, no study has pinpointed the exact mechanism by which the AGP work in the animal intestine. [More.]
You’ve probably noticed that your brain will try to reconcile contradictory visual info. Showing different images to each eye will causes someone to essentially see only one or the other at a time (although it will switch back and forth).
< ?dbfo label-width="0.25in"?>