Inheritance of White Colour in Alpacas - Australian Alpaca Association

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(Figure 3.6). Black animals will have black fibre at the skin, but may have paler fibre tips and topknots due to weathering. Heterozygotes of these two alleles (i.e. a t a) will have minimal ventral pheomelanin, but may also appear to be a less intense black overall. Figure 3.3: A b a t & A b a genotypes. The black points are still clearly present, and the colour of the body is darker, sometimes with the appearance of a black overlay (image on right) and is often described as mahogany. Figure 3.4: The A b A b genotype has clear black pigment on the muzzle, around the eyes, on the ears and on the lower legs. The body colour is bright red to dull red. 14
Figure 3.5: Black & Tan phenotypes of the genotype a t a t . Note the characteristic presence of pheomelanic fibre on the ventral surfaces, including the chin, chest, armpits, groin and under the tail. Figure 3.6: Black phenotypes, with genotype aa. The effect of weathering on the colour can be seen in the contrast between the topknot and the body in the freshly shorn animal on the right. MC1R (E) Mc1r is the second of the two alpaca base colour genes. There are two alleles hypothesised to exist at Mc1r. In order of dominance these are: � E = normal colour � e = prevents the expression of black (eumelanin) Note that E is completely dominant over e. 15
Page 1: Inheritance of White Colour in Alpa
Page 4 and 5: © 2011 Rural Industries Research a
Page 6 and 7: About the Author Dr Kylie Munyard o
Page 8 and 9: Tables Table 2.1: Primers designed
Page 10 and 11: Executive Summary What the report i
Page 13 and 14: Introduction At the August 2006 AAA
Page 15 and 16: Melanosomes Melanosomes are the sit
Page 17 and 18: There is a three step process by wh
Page 19 and 20: cause variation of intensity of col
Page 21 and 22: Methodology Animals All research fo
Page 23 and 24: was added to the isolated aqueous p
Page 25: Figure 3.1: Agouti genotypes AA, Aa
Page 29 and 30: Figure 3.8: An A b A b ee alpaca cl
Page 31 and 32: Roan (Rn) Roan is the second most c
Page 33 and 34: Appaloosa There is insufficient dat
Page 35 and 36: Physical Analysis of Colour The spe
Page 37 and 38: Figure 3.19: Comparison of total me
Page 39 and 40: Table 3.1: The colour phenotype and
Page 41 and 42: � The black is being diluted by a
Page 43 and 44: Table 3.4: Mc1r genotypes of non-bl
Page 45 and 46: Table 3.5: Mutations in the Tyrp1 g
Page 47 and 48: Differences in Gene Expression Colo
Page 49 and 50: functional RNA is very quickly degr
Page 51 and 52: Implications This research clearly
Page 53 and 54: References ABUL-HASSAN, K., WALMSLE
Page 55 and 56: KOBAYASHI, T., URABE, K., ORLOW, S.
Page 57: Inheritance of White Colour in Alpa

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