None of this is intended as a criticism, just trying to help.
Is this the same brooder you used with the last batch of chicks that you had trouble with?
First off, it's way too small. They need more room to get in and out of the heat source. You need to check your temperature under the light, make sure it's adequate to warming them. Put a thermometer at their level, under the light. To me it looks like that heat source/bulb is not enough for that many chicks.
Is the wood of the walls particle board with a veneer over it? If so, particle board often contains formaldehyde and those fumes could be affecting the chicks. I also wonder if they are pecking at the bare edges around the opening on the right and eating some of it.
Loud chirping is a sign of distress.
Personally I would find another container asap, a large rubbermaid tub, a bath tub, something that will not emit any fumes at all, see if you can get any recovered. If it's fumes, it can kill them quickly.
Is this the same brooder you used with the last batch of chicks that you had trouble with?
First off, it's way too small. They need more room to get in and out of the heat source. You need to check your temperature under the light, make sure it's adequate to warming them. Put a thermometer at their level, under the light. To me it looks like that heat source/bulb is not enough for that many chicks.
Is the wood of the walls particle board with a veneer over it? If so, particle board often contains formaldehyde and those fumes could be affecting the chicks. I also wonder if they are pecking at the bare edges around the opening on the right and eating some of it.
Loud chirping is a sign of distress.
Personally I would find another container asap, a large rubbermaid tub, a bath tub, something that will not emit any fumes at all, see if you can get any recovered. If it's fumes, it can kill them quickly.