Head colour genetics

[KENTUCKY]

Clerical error, it should read Type b Hens and not Type c Hens
The clerk got the bullet.

[Tiaris]

Genetically impossible, there must have been funny business going on, (not unheard of) particularly if you colony breed
from a pair of YHs, where the Cock bird is split to BH, this mating can only produce BH hens type (c)
no BH Cock birds ever, in a colony system,one can not guaranty with absolute certainty the parentage of a particular brood of youngsters,
to be absolutely certain that these particular youngsters were bred by this particular set of parents, one must cabinet breed, one pair per cabinet,only then can one state without doubt that these youngsters are the off spring of this particular breeding pair, they must be, because in cabinet breeding there is no outside medeling.

Or single pair in mixed finch aviary. (My preference over cabinets)

[vettepilot_6]

Genetically impossible, there must have been funny business going on, (not unheard of) particularly if you colony breed
from a pair of YHs, where the Cock bird is split to BH, this mating can only produce BH hens type (c)
no BH Cock birds ever, in a colony system,one can not guaranty with absolute certainty the parentage of a particular brood of youngsters,
to be absolutely certain that these particular youngsters were bred by this particular set of parents, one must cabinet breed, one pair per cabinet,only then can one state without doubt that these youngsters are the off spring of this particular breeding pair, they must be, because in cabinet breeding there is no outside medeling.

But Iaos said he only had RTBh's in the colony..and he ends up with 1 YT Hen and 2YT Cocks?? so how does that work?

[Tiaris]

RT BHs can be split to YH, so YT BHs can be produced in both sexes as the YH gene is not sex-linked.

[vettepilot_6]

RT BHs can be split to YH, so YT BHs can be produced in both sexes as the YH gene is not sex-linked.

But my understanding is BH sho
the split. .he had all rt BH's?

[Tiaris]

two Rt BHs which are both split to YH mated together will produce Yt BH progeny.

[POLAR GOULDIANS]

Hi vettepilot_6,
A RH or BH bird can have either 0, 1 or 2 YH genes.
If it has one YH gene it is considered split, but will still appear it's normal colour.
If it has 2 YH genes and is RH it will appear YH, if it has 2 YH genes and is BH it will still appear BH but will have a Yellow tipped beak

[POLAR GOULDIANS]

This is the sort of thing I was referring to over on the finch lounge page with regard to genetics.

A BH split YH male and a BH split YH female can produce :


BH with no YH genes
BH split YH which appears normal BH
BH with 2 YH genes which appears normal BH but with a Yellow tipped beak

This applies to both males and females offspring, so effectively 6 possible outcomes