Last week I hatched out 9 chicks from 36 eggs. Terrible. Temperature was too low incubator heating element began to fail. Chicks were to supplement another cohort of identical parentage. Same mother and father, eggs marked, chicks hatched while confined to pedigree baskets. Chicks look very different from full siblings hatched 28 days prior. Last lot has many with down and wing primaries that should be barred and nearly black. They are a cross between American dominique (hen) and California grey (rooster). Is temperature during incubation known to influence pigmentation?