really worried

[bahrainchicken]

Hi,i have around 2000 chicks and i am new in this busniess for the past one month every thing was going normal but recently i have noticed that 3 to 8 chicks are having breathing problems they pull thier neck out and open thier mouth wide open in one minute they do it like ten times i am very worried i have given them before the three vaccination lasota, clone 30,and gumboro pls help me what to do thank you

 

[Nutcase]

I'm not entirely sure what is going on. I've noticed it in my chickens when they were younger. I just called it 'the yawning disease' (lol)because it looked like they were yawning. However there were no other symptoms and they were all fine. Have you noticed any other behaviour out of the ordinary?