Weak legs and not nursing

We had a calf this morning and it was dried up but freezing it wouldn't nurse and could barely stand so we brought her to the basement and is still  there. We tried the bottle and it wouldn't suck it took half a bottle at noon and we had to tube her with a 16oz at 4 and did her again at because she refused to nurse we are taking her to her mother at midnight to see if she will nurse her. But when we found her she had both back legs under her front legs like a crayfish does. Now she can barly stand without help and her hock joints are huge and she has straight back legs with even some boy legged qualities if you have any ideas on what to do please help

Might try some BO-SE. Sounds to me like it could be a selenium deficiency.

Do you know if the calf had any colostrum at all? That is the most important thing you can get in it as fast as possible. I agree Bo-se or Mu-se could be of help, but I am NOT a vet. We have used a bale of straw and set under weak calves to assist in nursing. But if the calf is cold there and has been for queit sometime you need to get the core temp up or things will shut down and it will continue to be sluggish. Cold temperatures cause systems to slow. Get the calfs temp up and get colostrum in him. Many ways you can warm them. Heating pad and warming blanket. We have built warming tents with blow dryer and keep stimulating the calf. if you can milk the mother and give him some milk or tube him and get colostrum in it will help bunch.

Did you find the calf in that type of configuration? (hind legs forward?)  Often times that can indicate a spinal injury.  Is the calf moving it's hind legs at all?  Are they immobile?  If there is no coordination I would suspect spinal involvement.  Then there is also the issue of the swollen hocks which can indicate several things as well.  Can you post any pictures?  It's hard to give a solid answer blindly.  The BoSe or MuSe can't hurt to try!

We tubed the calf with colustrum yesterday at noon. And yes it is starting to move but is still wobbly. She is with her mother now and we are still trying to get her to suck I might try the selenium it can't hurt at this point! Thank you I will try to post pictures as well!

I had a calf last year that was the same way joints wise. When she was first born and tried to stand up to nurse it was like she was standing completely underneath herself so we had to hold her while she nursed. Her mom doesn't have any structure issues but it was a new bull that we tried for us (Two Tone) and that was the issue. her joints were huge, she was too straight, and you could hear her joints pop when she walked anywhere. I tried everything the vet had told and even researching on my own and getting the calf acupuncture, I know it sounds crazy but whatever works... We eventually had to put her down because she didn't have enough energy to walk anywhere. I hope it works out better for you! good luck 

1/2cc Selenium, 1cc A-D and 4cc New Cells, once a day for 5 days.....I'm in vet school. I actually do this to all of my newborns now. Number of issues with newborn calves has decreased dramatically.
Always keep the pregnant cows on free choice mineral and salt with selenium. We vaccinate our cows with Triangle 9 +HS and Selenium/A-D at 6 months gestation. This has also helped live calf rates.