Early chick mortality due to retained yolk sac and yolk sac infection
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Retained yolk sac:





                               





Retained yolk sac and dehydrated:


           




Retained and inflamed yolk sac. The chick is dehydrated.


                        



Retained yolk sac:


                                



Retained and inflamed yolk sac in 13-day-old SPF chicken:


               




Yolk sac infection and septicemia: