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XXX.XXX.79.193
Ví někdo něco o tom že by byla zaznamenána nějaká barevná uchylka případně mutace těchto papoušků?
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XXX.XXX.176.144
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napsal(a):
Ví někdo něco o tom že by byla zaznamenána nějaká barevná uchylka případně mutace těchto papoušků?
straka
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XXX.XXX.156.2
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napsal(a):
straka
nemate najeke foto straky? zatim mi neni znamo ze by existovali, videl jsem jen par jedincu se zlutymi pirky, nejednalose vsak o mutaci ale pouze modifikaci.
kdysi se objevila zluta, ale nepodarilo se ji udrzet
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XXX.XXX.168.4
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napsal(a):
Ví někdo něco o tom že by byla zaznamenána nějaká barevná uchylka případně mutace těchto papoušků?
U jednoho chovatele v Rakousku jsem viděl straku, jemně strakatá křídla, silný kus.... prostě nádhera. Bohužel však už nevím, zda to byla modifikace či mutace.
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XXX.XXX.97.21
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napsal(a):
U jednoho chovatele v Rakousku jsem viděl straku, jemně strakatá křídla, silný kus.... prostě nádhera. Bohužel však už nevím, zda to byla modifikace či mutace.
Mutations & Modifications
The only color mutant that we are aware of among Agapornis canus is a yellow bird. According to Mr. Louw Van der Veen:
"The yellow phenotype should be considered a modification, not a mutation. I believe the bird in Dr. Martin's book and the one described by Mr. van der Linden to be the same. If I recall correctly it was found somewhere in the USA and finally bought by Messr. Horton and Dubuc, the bird dealers that founded the African Lovebird Society (ALBS). Pictures ... .... also appeared in the Avicultural Press worldwide.
Mr. v. d. Linden's references to the feather structure are correct. Mr. v. d. Linden co-worked with Mr. Beckman, the Dutch pioneer in this respect.
Of course "dilute yellow" is rather curious designation for a colour. Dilute yellow is something like beige. Melanin has been removed from an initially green bird, so dilute green might be possible. Still this was an acquired yellow. But since the bird is dead ... ...and it did not reproduce, I guess it would be best the describe it as a yellow phenotype that appeared once, but we should avoid even a hint of the word "mutation"... which is often defined by the successof the bird in question to be able to pass on the trait (s) in question." 6
The yellow bird is described in some detail by Mr. van der Linden in the paragraphs below. Mr. van der Linden also speculates on the color inheritance which might have arisen from such a bird, had it lived to reproduce its color modification:
"Only one mutational occurrence is documented. That of a yellow canus. This concerned a hen that exhibited normal green coloring as a juvenile but molted into yellow after the molt.
The description of the bird follows:
Forehead, cheeks and its yellowish white tremble. The remaining body color is deep yellow. The wing feathers are white. The secondary tail feathers show a white diagonal design and are yellow at the ends. The eyes are dark brown. The beak color is horn. The legs are light grey.
Canus...
In so far as I am aware, only the yellow mutant has occurred.
Microscopic investigation of the grey coloring of the cock has brought a remarkable fact to light. It appears that the tip of the feather is in fact clean violet.... The tip of the feather entertains a spongy zone and vacuoles that, when combined with the diameter of the shaft, serve to interfere with light waves in a way that enables us to perceive the exiting light as violet. Moreover, the edges of the violet feather tip appear colorless. Yellow psittacine was found at the base of the feather shaft, as well as at the edges. Between the yellow and violet feather structure, is a narrow transition zone, which contains melanin, which provides a merged green transition zone.
The combination of violet feather tip - green transition zone - and yellow feather base leads us to perceive a grey color. Could the A. c. canus mutation reveal how yellow psittacine is blocked or not. If so might we not be able to achieve blue canus cocks with a pale violet head, neck and breast color. Back and wings would be dark sky blue. The underbelly and anal region also sky blue.
The hens would have a dark sky-blue back and wings and a sky-blue head and underbelly.
would such a mutation, which interferes with melanin, in the way described, cause the body color of the cock to become yellow ? The heads might be a considerably lighter yellow because psittacine production in the feather tip is missing. The hens would look similar in body color to the yellow mutant, with red eyes and vleeskleurige. Since it is a co-dominant mutation birds split for dark factor do not exist."
Evidence of the yellow modification in the Madagascar can be seen in Dr. Terry Martin's Book: A Guide to Colour Mutations & Genetics in Parrots. A photograph of the bird can be found on page 71. Today, this bird would receive a dilute green designation, as the bird in the displayed photograph exhibits a black eye. The picture appears to have been provided by Mr. R. Erhart. It is interesting hat the bird has been described by Mr.v. d. Linden as a green hen that turned yellow through the molt (Interestingly enough,we have heard of similar incidents of green birds turning yellow at the molt in both roseicollisand taranta). Oddly enough, both beak and feet appear pink or flesh colored, which they should have been before the molt. The localized color distribution (white) in the photograph also speaks to the fact that the bird was indeed a hen.