Hereford car weak rear legs

We ended having a female Hereford having a calf a little over 3 weeks ago, today would be the start of week 4. The mother didnt want the calf. From the beginning the calf had trouble getting up, but would walk (if we got it up, it would walk). For the 1st and 2 week we would help her up, but on the 3rd week on she started having trouble and from Wednesday on she started not to stand up in general. She can hold her weight on the front legs but not the back. She went from putting weight on one leg rear leg sometimes to nothing. Shes eating alright, but she shivers when done eating and in between sometimes (the morning wasnt too bad). We have the powered medicine milk from tsc and she goes through 5 to 6 pints a day (went from 2 cups of powder to 3) twice a day (5 am and 4 pm). Her crap is a good color and her pee is clear. It seem like it takes her a bit of effort to get up. Anyone have this issue before?

Lots of possibilities. If its a bottle calf, is it getting any exercise? We had one this year that took a few weeks to really get its legs because it spent all day laying around between feedings. Check the milk replacer ingredients. Some animals have trouble digesting soy, if its listed try a new milk replacer.

A lot of unknowns here, from lack of
details.

Was the calf pulled, or did momma cow have
it on her own? Was it her first calf, for
the cow? Has the cow completely abandoned
it since it hit the ground? Being separated
this entire time, and raised as a bottle
calf from the beginning? These details
would sure help alot, in figuring out
what's wrong.

New born calves need first feeding
chelosterim (spelling?) from its mom. If
not, there is a packet you can buy for
this. Either way, it's to late for that
now. A calf needs this within hours of
being born, not days. If it didn't get
this, it might be an explaination of what's
going on now.

Some milk replacers are JUNK! The ones to
watch out for, are the ones made entirely
from soy. Calves don't seem to have a very
good survival ratio on those type milk
replacers. The better ones are made from
dried milk products.

Sometimes if a cow has trouble having a
calf, or it was pulled, the calf will end
up with physical problems. Sometimes they
will live thier way out of the damage that
was done, and sometimes not.

What is Powered Medicine Milk from tsc?
Medicine for what? No offense or anything,
but if your feeding this thing any kind of
medicine at all, it should be what's
recommended by a Vet. Not what was
suggested by the shelf stocker at tractor
supply.

I don't know. I'd talk to a vet, if you
haven't done so already. Bad part is,
sounds like you needed some good advice
before now. Hope it's not to late. Post
back with more details, if you need more
help from here.

As redforlife said, you're not going to know until you call a vet and maybe not even then. Could easily be a neurological or nerve
problem. If is's something like a selenium deficiency, you won't know without a blood test, and even then the sample might have to
be sent to a University lab if the vet can't test for it.