In short, no, it varies. Most mammals can produce their own vitamin C, for example, so they don’t need to take it in with food. Humans (and other primates from the same group as humans, and also bats and guinea pigs) can’t make their own vitamin C, and therefore require to have it in their diet. In humans it’s due to a certain mutation that have broken our vitamin-C-making gene a long, long time ago.

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So humans need to eat more vitamin C than other mammals ?

Other mammals, unlike humans, don’t even need to eat vitamin C at all.

Cheers

Every vitamin is used by bodies for some purpose. Depending on what a certain species has or do, you'll need more or less of certain vitamin.

Animals with "bigger" brain will usually require more energy to make it work. Animals with large, constantly growing claws/teeths will need certain vitamin to keep growing them. Animals with hot blood will need more food for their heat.

Everything has a use, and what your body can do decide how much of each you need in average.

So applying the RDA for vitamins and minerals to mammals would make no sense? (After modifying for body weight of course)

I am no animal expert, so consult an expert if you do need to do that for any reason.

If it's only as a food for thought, depending on the mammal you'd probably be fine unless whatever animal has a very prominent feature you need to worry about. Farm animals have prominent features (cow produce lots of milk, sheep produce lots of wool) that most likely unbalance things a lot compared to us. Other mammal like cats and dogs probably have a balance close enough that the variation between their RDA and ours should be fine.

If you look at anything other than mammals, things change drastically. Hollow bones and feathers in birds, cold blood and scales in lizards, etc... are probably much further away from us.

Again, not expert on this subject, consult an expert if you're planning on putting your dog on the same diet as yourself.

All species have their own nutritional needs.

The genetically closer 2 species are, the more similar will be their nutritional needs, but it's still not the same.

Mammals are a large group with very distinct diets, so their nutritional needs are very distinct.

Our nutritional needs are more similar to chimp and primates in general.

All animals need energy (as carbs including fibers for the ones with bacteria that can ferment them, fat and/or proteins) and minerals (including nitrogen for the ones who have bacteria that uses nitrogen to make proteins). The ones that don't have bacteria that produces proteins, must also eat proteins, but they don't need nitrogen outside of the proteins.

Vitamin need aren't shared by all animals.

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