What the chicks of a Bielefelder and a Olive Egger look like and lay, worked out from both breeds' standards.
A Bielefelder hen crossed with a Olive Egger rooster gives you what keepers call a first-generation (F1) cross. About 50–100% of the pullets should lay olive eggs (some may be green); the others lay brown. Most chicks (50%) get a pea comb. Barring is sex-linked in this direction: the cockerels hatch barred and the pullets do not, so the chicks can be sexed on hatch day. Expect a large bird, a good layer, hand-tame, the average of the two parents.
♂♀ Sex-linked cross: barring tells cockerels from pullets at hatch.
Preset to a Bielefelder hen and a Olive Egger rooster. Change either side to see how the blue gene and the brown coat move the shell colour.
He never lays, so his blue gene is read from his mother's eggs.
Probably Olive (possibly Green): 50–100% blue-based; otherwise Brown.
Brown shade shifts with a hen's age, diet and stress, so identical genes still lay a little differently. Speckling and bloom are cosmetic and not modelled.
| Trait | Bielefelder hen | Olive Egger rooster | Chicks |
|---|---|---|---|
| Comb type | Single | Pea | Pea 50% · Single 50% |
| Barring | Barred | Not barred | Barred 50% · Not barred 50%sex-linked: ♂ 100% barred, ♀ 0% barred |
| Fibromelanosis | Absent | Absent | Absent |
| Skin color | Yellow | White | White 50% · Yellow 50%yellow depends on a hidden carrier, so it could be 0%; a hatch or a known genotype can confirm (uncertain) |
| Leg color | Yellow | Slate | varies: polygenic, parents differ |
Barring and silver are carried on the Z chromosome, so which parent is which changes the chicks.
| Trait | Olive Egger hen | Bielefelder rooster | Chicks |
|---|---|---|---|
| Comb type | Pea | Single | Pea 50% · Single 50% |
| Barring | Not barred | Barred | Barred 50% · Not barred 50%assumes the sire carries not barred, so it could be 0%; a hatch or a known genotype can confirm (uncertain) |
| Fibromelanosis | Absent | Absent | Absent |
| Skin color | White | Yellow | White 50% · Yellow 50%yellow depends on a hidden carrier, so it could be 0%; a hatch or a known genotype can confirm (uncertain) |
| Leg color | Slate | Yellow | varies: polygenic, parents differ |
A Olive Egger hen crossed with a Bielefelder rooster gives you what keepers call a first-generation (F1) cross. About 50–100% of the pullets should lay olive eggs (some may be green); the others lay brown. Most chicks (50%) get a pea comb. Most chicks (50%) are barred. Expect a large bird, a good layer, hand-tame, the average of the two parents.
| Trait | Bielefelder | Olive Egger | Chicks |
|---|---|---|---|
| Frame height | large | medium | large |
| Egg production | good layer | good layer | good layer |
| Broodiness | rarely broody | rarely broody | rarely broody |
| Docility | hand-tame | calm | hand-tame |
| Bone density | sturdy | medium | sturdy |
| Foraging skill | good forager | good forager | good forager |
| Cold hardiness | cold-hardy | cold-hardy | cold-hardy |
Chicks land near the average of the two parents for these traits. Reaching one parent's extreme takes another generation of selection.
This is the breed-standard version. Add your flock, set a breeding goal, and the pairing engine ranks every hen and rooster you own against it. Free for up to 15 birds.
Checked September 2026. Hybrids and breeds no reference covers are marked approximate. Egg colour on these pages follows one rule: Brown is any shade a buyer would call brown; Cream/tinted is off-white.