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Yes, every two genes that are located close to each other on the same chromosome will show "close linkage", this goes for any genes in anything. There are several others in chickens found and documented to have close linkage but most are obscure and not very useful to the hobbyist.. such as some blood types, dark feather pigmentation etc. I can't think of specific ones right now, pea comb and the O gene is simply the most well known and of interest as trying to develop their own line or introduce the blue/green eggs into a breed is a relatively common hobbyist goal. This linkage probably was studied due to past interest in possibly making blue/green egg production birds- pea comb also cause an fold of extra skin to develop along the breast bone ridge, which is undesirable for birds kept in battery or cage situations as this makes the birds prone to breast blisters. Could be why Legbars were developed in England, using the rare single combed blue egger to start that line.
6 nn out of 30.. that is pretty amazing. My first thought was did another non-NN roo sneak in or the hens still had sperm from previous rooster? I suppose that can happen but that is amazing.. I don't know of anything about dark skin having any effect on growth(but then I don't know much about this gene, am still learning about it myself).. but am wondering if that is a clue, maybe the dark skinneds (and some not) were out of the same father and the other larger ones were from another and larger roo? I'll take a look at my birds and see if there's a size difference between black skinned and normal skin siblings..
Yes, every two genes that are located close to each other on the same chromosome will show "close linkage", this goes for any genes in anything. There are several others in chickens found and documented to have close linkage but most are obscure and not very useful to the hobbyist.. such as some blood types, dark feather pigmentation etc. I can't think of specific ones right now, pea comb and the O gene is simply the most well known and of interest as trying to develop their own line or introduce the blue/green eggs into a breed is a relatively common hobbyist goal. This linkage probably was studied due to past interest in possibly making blue/green egg production birds- pea comb also cause an fold of extra skin to develop along the breast bone ridge, which is undesirable for birds kept in battery or cage situations as this makes the birds prone to breast blisters. Could be why Legbars were developed in England, using the rare single combed blue egger to start that line.
6 nn out of 30.. that is pretty amazing. My first thought was did another non-NN roo sneak in or the hens still had sperm from previous rooster? I suppose that can happen but that is amazing.. I don't know of anything about dark skin having any effect on growth(but then I don't know much about this gene, am still learning about it myself).. but am wondering if that is a clue, maybe the dark skinneds (and some not) were out of the same father and the other larger ones were from another and larger roo? I'll take a look at my birds and see if there's a size difference between black skinned and normal skin siblings..
