Worms are one of the commonest cause of poor performance. A simple screen will confirm whether or not you are controlling them.
Pigeon hairworm egg – Capillaria sp.
Pigeon roundworm egg – Ascaridia columbae
Pigeon coccidial oocysts – E.labbeana
Last Revision: 06/04/13
They can be brown or green. Usually you cannot see the cells dividing inside to form the worm larva.
Round worm egg.
You can see the thick smooth wall. Sometimes, as in this case it has faecal material stuck to it. Usually they are brick shaped with curved corners but occasionally, I have seen a spherical roundworm egg.
Pigeon coccidial oocysts.
You can see one or two that have sporulated.