What would cause 8 (out of 14) seemingly healthy day old chicks to die suddenly??

[realsis]

i looked up sudden death syndrome or flip over in my chicken health book. it says its its a heart attack. systems organs affected are heart and lungs. in postmortem findings they have bloated bright red lungs; pools of fluid between rib and lung; sometimes mottled muscles liver and kidneys . it mostly happens to broilers between 1-12 weeks of age up to 5 %are affected. death happens within 1 minute of first symptoms
its common world wide. it may have something to do with weight gain and feed intake... i hope this is helpful and I'm so sorry for your losses! there was absolutely nothing that can or could be done for this syndrome! and it does affect 5%. best of luck and again I'm so sorry!

 

[junglemama]

I just incubated my first set of chicks and stupid me, I followed the directions that came with the incubator (Little Giant- Still air incubator) 42 eggs at day 14 candling half were no good (yolkers/quitters) half were active and growing, saw an air cell in the large end. After that I did not candle again. Kept humidity between 55-65 and temp at 99.5 (I read with still air it should actually be like 102, and that I should use a secondary thermometer, will do next time!) On hatch date nothing, the next day, internal pipping, and one external pip, but more to side of egg, about 10 am but no more progress. By 9 pm that night I decided to chip off the little piece it had loosed and try to see if I could see its beak, and I did and it started pipping excitedly so I very carefully removed the outer membrane to let it breathe then left it alone for several hours, however, while assisting it I noticed another had externally pipped, it was on the underside, So I had not noticed, Idid not hear any internal pipping so I broke the piece of shell off and exposed the beak, but could tell right away it had died trying to pip! After that I was more carefully observant, and assisted a total of 7 chicks out of their shells! They all looked pretty pathetic and bedraggled, barely able to stand up for a moment for day 1 and I was not hopeful.But I put them on clean cardboard to dry and they all fluffed up by day 2 and I had hope. One was still not fully dry so I put her in a ceramic cup for 'cup therapy' Finally when she dried out, I introduced food and water and weaned the temperatureto 88 (room temperature here in the tropics) I have always before bought day onkd chicksfrom the hatchery and pit them directly into a cage (nighttime temps do not drop under 70ish here) But since these guys struggled so much I wanted to give them more time in there, so I left them in tnere allday, checking often and that evening I moved them out, cleaned the incubator out, emptied out the water and set the temp to 95 and geve them fresh water/food......I checked on the twice in the night, at 12 and at 4 am at 4 tney wew huddled undef the heat lamp so I upped the temo to 98.6, I tnemorning, I discovered one dead (not pasty butt) !!! It was oane of tbe healthiest seeming ones, I dipped everyone's beak in the water again to be sure they were drinking.....a few hours later another chick is dead, alao a very healtny one...seemingly, I mean, I guess none of them had the best start, the humidity detector must be wrong, because the humidity was clearly too high (all pipped in middle of shell, little to no air cell in any egg) I will as I said use a second thermometer, and keep humidity even lower, plus I did not realize I should lowertemps for lockdown....but any advice as to what is causing these sudden deaths and or what I might do to prevent further deaths wouldbe well appreciated!

 

[Chicktori]

Can cold water kill chicks ?