If you get more Polish and the same things happen you may want to document their downfall and then submit those images or video along with the bird to a veterinarian or state ag office for autopsy. Its hard to say without being able to see the birds first hand.
you said you are feeding them chick starter, maybe you need to switch to chick developer? It is a coarser ground feed which may be easier for them to pick up and to grind up in digestion.
in terms of crest trimming, its only necessary if you feel their vision is being obstructed. I generally trim it into a mohawk type look so that the eyes are not obstructed. It doesn't always needto be done though, and as stated there are points in the bird's development where the feathers grow bigger than the rest of the bird,but the bird eventually grows into them. You can start at a few months old if they need it.
you said you are feeding them chick starter, maybe you need to switch to chick developer? It is a coarser ground feed which may be easier for them to pick up and to grind up in digestion.
in terms of crest trimming, its only necessary if you feel their vision is being obstructed. I generally trim it into a mohawk type look so that the eyes are not obstructed. It doesn't always needto be done though, and as stated there are points in the bird's development where the feathers grow bigger than the rest of the bird,but the bird eventually grows into them. You can start at a few months old if they need it.
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