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the normal blue bird is white. This hen ... was mated with a cobalt/white cock and they have produced five youngsters, all having yellow masks like their mother. Mr Long's birds were bred from a dark green of a somewhat olive shade mated to a rather unusually coloured hen, which appears to be a green but has a turquoise suffusion on the breast, etc. The first nest produced 3 cobalt birds with yellow masks, etc, like Mrs Lait's birds described above, and one green-blue bird like the mother. The second nest produced exactly the same result."
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the yellow pigmentation, either entirely or to some degree, with respect to the wild-type Light Green. Had these mutations been named 'Yellow-less' rather than 'Blue' or 'Yellowface' their action might have been more easily understood from the outset. But the traditional names are engrained and are
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in 1935. A contemporary report of his breeding says, "Mrs Lait mated a dark green cock to a greywing mauve hen, and in their third nest was a pale greywing mauve hen with a distinct (light lemon yellow) mask and bib, with the under tail feathers yellow and with yellow on the wings in the places where
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The single factor (SF) Yellowface II Skyblue variety is like a normal Light Green but has a very bright body colour midway between blue and green — a shade often called sea-green or turquoise. The body feathers of the SF Yellowface II Cobalt are bottle-green and in the SF Yellowface II Mauve
48:
The double factor (DF) Yellowface II Skyblue variety is very similar to the
Yellowface I Skyblue, but the yellow pigmentation is brighter, and tends to leak into the body feathers to a greater extent.
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The description of the birds suggests that Mr Long's birds were a DF Yellowface II Cobalt cock and a SF Yellowface II Cobalt hen, but the breeding of
Cobalts with yellow masks places this in doubt.
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520:
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510:
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Although not recognised as such at the time, it is possible that the first
Yellowface II birds to be reported in the UK were bred by Jack Long of
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79:
Much confusion and misunderstanding have arisen because the popular names given to these mutations are misleading. These mutations do not
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between the Dark and Blue loci is commonly stated to be about 14%, but some experiments have found much smaller values (see
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449:
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33:
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387:
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29:
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377:
572:
397:
372:
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137:
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with two
Yellowface II alleles is like a Skyblue with a variable green suffusion on the breast.
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306:
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a yellow face, as the names might suggest. Rather the action of all these mutations is to
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above, is a composite of the Blue and
Yellowface II mutations, having one allele of each.
8:
223:
107:
36:
mutations, the single factor
Yellowface II mutation produces the variety called Rainbow.
603:
103:. Although some breeders still dissent from this view it is the one followed here.
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and one wild-type allele is visibly indistinguishable from a Light Green, and the
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114:. Visibly, its action appears to be similar to that of the Blue mutation. The
618:
115:
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The genetics of the several
Yellowface mutations and their relation to the
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The prevailing view is that the
Yellowface II mutation, together with the
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21:
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598:
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141:
144:, so the Dark mutation is linked to the Blue allelic series (see
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is one of approximately 30 mutations affecting the colour of
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and the Blue allelic series are situated on the same
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or Light Green/yellowface II with one
Yellowface II
186:Bland, W P (Mar 1962), "A History of Budgerigars",
129:The SF Yellowface II Skyblue variety, described in
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76:are not yet fully and definitively understood.
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274:
334:
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106:On its own, the Yellowface II is a simple
201:"Another new variety, 'Golden Cobalts'",
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240:Gene function in Yellowface Budgerigars
45:they are a mixture of mauve and olive.
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279:(2nd ed.), The Budgerigar Society
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185:
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302:World Budgerigar Organisation (WBO)
270:(2nd ed.), W & G Foyle Ltd
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148:). The cross-over value (COV) or
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18:Yellowface II budgerigar mutation
277:Genetics for Budgerigar Breeders
275:Taylor, T G; Warner, C (1986),
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257:Taylor and Warner (1986), p 31
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170:
1:
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39:
7:
625:Budgerigar colour mutations
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24:. In combination with the
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594:Budgerigar colour genetics
290:(3rd ed.), Cage Birds
288:The Cult of the Budgerigar
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205:(39): 74, September 1936
158:Dark budgerigar mutation
138:Dark budgerigar mutation
203:The Budgerigar Bulletin
188:The Budgerigar Bulletin
150:recombination frequency
474:Yellowface mutations
403:Sex-linked Clearbody
286:Watmough, W (1951),
266:Rogers, C H (1973),
110:with respect to the
108:autosomal recessive
604:Selective breeding
383:Dominant Clearbody
219:The Parblue Puzzle
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611:
561:Feather mutations
499:Pattern mutations
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247:on March 25, 2002
176:Rogers (1973) p46
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542:Clearflight Pied
417:Fallow mutations
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351:Colour mutations
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307:WBO Colour Guide
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243:, archived from
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222:, archived from
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136:The loci of the
58:Gorleston-on-Sea
52:Historical notes
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547:Australian Pied
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434:Scottish Fallow
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226:on 14 June 2006
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146:genetic linkage
88:retained here.
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587:Related topics
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573:Feather Duster
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552:Recessive Pied
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535:Pied mutations
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465:Recessive Grey
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443:Grey mutations
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424:English Fallow
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296:External links
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97:Blue mutations
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486:Yellowface II
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455:Dominant Grey
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74:Blue mutation
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485:
481:Yellowface I
460:English Grey
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245:the original
239:
237:Bergman, P,
232:
224:the original
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116:heterozygote
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93:Yellowface I
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268:Budgerigars
22:budgerigars
578:Half-sider
521:Saddleback
450:Anthracite
343:Budgerigar
164:References
131:Appearance
124:homozygote
40:Appearance
506:Blackface
368:Clearwing
345:mutations
112:wild-type
34:Clearwing
619:Category
599:Mutation
388:Greywing
363:Cinnamon
154:Genetics
142:autosome
81:generate
68:Genetics
568:Crested
526:Spangle
516:Opaline
511:Mottled
190:: 25–30
156:in the
30:Opaline
408:Violet
378:Dilute
120:allele
85:reduce
398:Slate
373:Dark
101:locus
358:Blue
95:and
32:and
26:Blue
16:The
393:Ino
160:).
621::
28:,
335:e
328:t
321:v
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