it was the 10th day. the chick was opening and closing its mouth to breath.
By the 10th day.. that is not usually a hatching anomaly.. unless working some lethal genes.. that can cause death even up to about 3 weeks old.
It *could* have been coccidiosis.. IF they were crowded, their bedding was wet, or any poo droppings got in the water. It usually has some symptoms but can be easy to miss in larger groups like yours. Symptoms cannot appear before day 7 according to my current understanding.
Pasty butt HAS been seen even in chicks hatched at home and/or EVEN raised by a broody.. Again sometimes easy to miss in bigger groups, it is not solely cause by shipping stress as we are often led to believe. It never starts happening before day 3 or 4, HERE. Pasty butt can be deadly fast, within 48 hours. Were there any signs at the vent that might indicate such?
Opening and closing the mouth.. is often a symptom of gasping for air.. which CAN be a sign organs are failing.. they cannot pump enough oxygen through the blood. This CAN be due to ANY end of life condition.
The crop or gizzard might have gotten a blockage of sorts.. causing slow, sour, or blocked crop.. often indicated by excessive drinking and decreases appetite, but not always.
If there was no snot, discharge, sneezing, etc.. then I would not worry too much about the respiratory distress being contagious..
Be aware of the coccidiosis, pasty butt, blocked crop etc.. but I consider 1 out of 30+ to not be of MAJOR concern.. and almost indicating that you MAY be doing something right!
Hope they continue to thrive!
