Two weeks old gosling won't/can't stand up

[TheKirad]

I have two gosling that are around 15 days old. One is big and healthy, probably gander, and the other is smaller and was healthy until like 2 days back

She can't stand up on her feet. She is lying all the time, sometimes stand up on her "ankles" but not her feet. She is eating, pooping and drinking without problem. She isn't lethargic or anything, just won't stand and walk on her feet.
I examined her legs, I'm not an expert, but I don't see anythint wrong or different to the gander.
Do you guys have any ideas what could it be?

 

[Goosebaby]

It could be a niacin or protein deficiency.

 

[TheKirad]

It could be a niacin or protein deficiency.

In that case, what would you recommend to do? I'm rather unfamiliar with vitamins and minerals

 

[Goosebaby]

@TheKirad Tractor supply has durvet B vitamin complex, it says injection but you can give it to them in their water or a few drops on the tongue.
I don’t know what kind of start you’re feeding them but sometimes chick start doesn’t have enough protein or niacin that baby waterfowl need so you may need to switch to a flock raiser if you aren’t already feeding it to them.
A little boiled egg could be offered also to boost their protein in the meantime.

 

[casportpony]

What kind of food are you feeding?

 

[TheKirad]

What kind of food are you feeding?

I just switched from a Energys mini to maxi, which is the most sold feed for them in my country

 

[casportpony]

I just switched from a Energys mini to maxi, which is the most sold feed for them in my country

can you show us a picture of the bag? What country are you in?

 

[TheKirad]

can you show us a picture of the bag? What country are you in?

Here is picture of all the stuff in both of them.
I'm from Czechia, Central Europe

 

[casportpony]

Can you contact the mfg and ask what the niacin content is?

 

[Isaac 0]

I would start your birds on a supplemental source of niacin as soon as possible.