The objective of the study was to evaluate the phenotypic variability of the percentage of medullated fibres of Huacaya alpacas, as well as to calculate the phenotypic correlation between the average diameter of fiber (ADF) and the percentage of total medullation (PM). Fibre samples were collected from 36 Huacaya alpacas (0.4-10.4 years old males) to analyse the ADF and the PM with the projection microscope. The type of medulla of the fibres was considered as not medullated, fragmented, discontinuous, continuous and strongly medullated. A high phenotypic variability of PM between alpacas and within the samples was observed. The mean ± standard deviation of PM and ADF was 32.56 ± 18.30% and 17.58 ± 2.52 μm for non-medullated fibres; 29.29 ± 11.67% and 21.49 ± 2.39 μm for fragmented medullated fibres; 14.01 ± 10.14% and 24.04 ± 2.40 μm for discontinuous medullated fibres; 23.90 Â...

The objective of the study was to evaluate the phenotypic variability of the percentage of medullated fibres of Huacaya alpacas, as well as to calculate the phenotypic correlation between the average diameter of fiber (ADF) and the percentage of total medullation (PM). Fibre samples were collected from 36 Huacaya alpacas (0.4-10.4 years old males) to analyse the ADF and the PM with the projection microscope. The type of medulla of the fibres was considered as not medullated, fragmented, discontinuous, continuous and strongly medullated. A high phenotypic variability of PM between alpacas and within the samples was observed. The mean ± standard deviation of PM and ADF was 32.56 ± 18.30% and 17.58 ± 2.52 μm for non-medullated fibres; 29.29 ± 11.67% and 21.49 ± 2.39 μm for fragmented medullated fibres; 14.01 ± 10.14% and 24.04 ± 2.40 μm for discontinuous medullated fibres; 23.90 Â...

In alpacas color fleece phenotypes have different terminologies that induces confusion within the brown color and its shades, it requires a better description and quantification. Consequently, the aims of the study were to quantify the color of fiber and identify the informational SNPs in the MC1R gene (melanocortin 1 receptor) in brown and black alpacas. A vicuña phenotype (n=14) and four alpaca phenotypes (n=79), light brown, dark brown, brown-black and black were evaluated by colorimetry. The vicuña fleece showed greater lightness (47.74) and color intensity (24.33) compared to brown alpacas. The CIE L*a*b* values (lightness and intensity) suggest low values in eumelanic alpacas and high in pheomelanic alpacas. In vicuña and alpaca, the coding sequence of the MC1R gene has a single exon of 954 bp, in vicuñas the deletion (c.224_227del) was not observed. However, this deletion was ...

In alpacas color fleece phenotypes have different terminologies that induces confusion within the brown color and its shades, it requires a better description and quantification. Consequently, the aims of the study were to quantify the color of fiber and identify the informational SNPs in the MC1R gene (melanocortin 1 receptor) in brown and black alpacas. A vicuña phenotype (n=14) and four alpaca phenotypes (n=79), light brown, dark brown, brown-black and black were evaluated by colorimetry. The vicuña fleece showed greater lightness (47.74) and color intensity (24.33) compared to brown alpacas. The CIE L*a*b* values (lightness and intensity) suggest low values in eumelanic alpacas and high in pheomelanic alpacas. In vicuña and alpaca, the coding sequence of the MC1R gene has a single exon of 954 bp, in vicuñas the deletion (c.224_227del) was not observed. However, this deletion was ...