I'm not sure if I've ever posted this on here or if anyone has seen it before but this has always intrigued me and I wonder if it's actually possible. Can you have a single combed chicken that lays green or blue eggs and that breeds true?
'5. Producing blue egg layers with single combs : cross leghorn hens (o+p+), (O represents the blue mutant, o+ signifies normal white), P - pea comb, p+ - single comb) with Araucana roosters 0P. All F1 hens should lay blue eggs and have pea combs,. Second, mate the F1 hens to Leghorn roosters. From the progeny select those pullets with pea combs as they should also lay blue eggs. When these pullets (Leghorn) begin to lay, cull any that lay white eggs (these will be few as they are crossovers). Third, continue this procedure for several generations, then mate hens with pea combs and that lay blue eggs to roosters with pea combs (nearly all of these will also carry the blue egg mutant). Through progeny testing of pea comb males that result from this mating, homozygous males can be located. They are progeny tested by matings to Leghorn hens. Homozygous males will produce only daughters laying blue eggs - test a set of 10 or more daughters per male. These males can then be used in the population to produce a homozygous stock of basically Leghorn ancestry and performance but laying blue eggs. '
here is the link for this: http://www.utilitypoultry.co.uk/araucana.shtml
'5. Producing blue egg layers with single combs : cross leghorn hens (o+p+), (O represents the blue mutant, o+ signifies normal white), P - pea comb, p+ - single comb) with Araucana roosters 0P. All F1 hens should lay blue eggs and have pea combs,. Second, mate the F1 hens to Leghorn roosters. From the progeny select those pullets with pea combs as they should also lay blue eggs. When these pullets (Leghorn) begin to lay, cull any that lay white eggs (these will be few as they are crossovers). Third, continue this procedure for several generations, then mate hens with pea combs and that lay blue eggs to roosters with pea combs (nearly all of these will also carry the blue egg mutant). Through progeny testing of pea comb males that result from this mating, homozygous males can be located. They are progeny tested by matings to Leghorn hens. Homozygous males will produce only daughters laying blue eggs - test a set of 10 or more daughters per male. These males can then be used in the population to produce a homozygous stock of basically Leghorn ancestry and performance but laying blue eggs. '
here is the link for this: http://www.utilitypoultry.co.uk/araucana.shtml