Duckling laying down excessively

[DuckMyLife8]

I have a 2 week old Cayuga duckling who spends noticeably more time laying down than the others. She is fed a 20% flock starter with 45mg/lb niacin (switching to 16% in the next few days), also I was giving supplemental Durvet B Vitamins to make sure they got enough and she gets pea treats so she shouldn't be niacin deficient. Her feet and legs are straight and normal looking. I cannot see any injuries, swelling or signs of bumblefoot. When she is active, she walks and runs around and acts normal otherwise. Theyre being brooded in the bathtub with puppy pads and no slip mats and have been getting more outside time daily (we are at about 30 min twice a day), first swim yesterday. She will lay down drinking and eating often and seems to tire quicker when playing, goes and lays down before the others. She doesn't act stressed in any way, in fact she's becoming my most calm and friendly and easily handled one. She loves playing with a cat toy ball but lays down playing with it even. Is there anything else I can do to help her or ideas what might be wrong? Does she just need to strengthen her legs? Its not extreme but definitely a noticeable difference. Not getting worse. She seems to be getting more active with more room to roam and activity but also more tired afterwards.

Picture of my sweet little Salem girl for duckling tax

 

[Ratchnick]

I have exactly this same thing, idk what the issue is, maybe a leg injury?

 

[DuckyDonna]

It sounds like you're doing everything right. I wonder if you could get something like a kiddie pool for a brooder instead of a bathtub? I don't know where you are but you might be able to set it up in your garage or another room at least. You could put cardboard or a dog fence around it to make sure they can't jump out but it would give them a lot more room to run and play.

 

[Ratchnick]

My duckling was never kept on a slick surface and is 6weeks today. Has been doing this for weeks.