haidut
Member
Can you share the food they are eating so that hidden sources of "vitamin A" can be looked for? I believe it was Grant who showed that when they were giving what they thought were vA deficient diets, they were actually not.
Most studies are done with the standard diet below, where a specific nutrient is removed.
Rodents - Feed and nutrition products | Purina
multipurina.ca
In this case, the vitamin A acetate will be removed. I understand there could be hidden vitamin A sources, but if we are removing the added vitamin A (which is the bulk of the vitamin A in the diet), the health of the animal should still improve, right? So, the idea is to just do a before/after on a diet with removed vitamin A for comparison of basic things like steroids, cholesterol, and maybe liver enzymes.