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" SDS is an acute heart failure disease that affects mainly male fast-growing broilers which appear to be in good condition. Affected birds suddenly start to flap their wings, lose their balance, sometimes cry out and then fall on their backs or sides and die, usually all within a minute. In...

This looks like a case of sudden heart-failure to me. It is not so unusual and known to happen mostly to young cockerels under the age of one year.