Relationships between skin follicle characteristics and fibre properties of Suri and Huacaya alpacas and Peppin Merino sheep

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Contents Vol 52(7)

doi:10.1071/AN11233

Food, Fibre and Pharmaceuticals from Animals

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Relationships between skin follicle characteristics and fibre properties of Suri and Huacaya alpacas and Peppin Merino sheep

M. B. Ferguson ^A , B. A. McGregor ^B ^D ^E and R. Behrendt ^C ^D

^A Department of Agriculture and Food Western Australia, South Perth, WA 6151, Australia.
^B Centre for Material and Fibre Innovation, Deakin University, Geelong, Vic. 3220, Australia.
^C Livestock Production Sciences, Future Farming Systems Research Division, Department of Primary Industries, Hamilton, Vic. 3300, Australia.
^D Formerly Wool Quality Department, Department of Primary Industries, Attwood, Vic. 3030, Australia.
^E Corresponding author. Email: bruce.mcgregor@deakin.edu.au

Animal Production Science 52(7) 442-447 http://dx.doi.org/10.1071/AN11233
Submitted: 14 October 2011 Accepted: 6 February 2012 Published: 3 April 2012





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Abstract

We aimed to quantify the number, type and arrangement of skin follicles in Huacaya and Suri alpaca skin and correlate their follicle characteristics with fibre traits of harvested fibre and compared these relationships with those of Merino sheep. Fibre and skin samples were collected from the mid-side of 12 Huacaya alpacas, 24 Suri alpacas and 10 Merino sheep. The mean fibre diameter (MFD ± s.e.) of the Huacaya and Suri were: 35.5 ± 0.9 and 28.3 ± 1.0 μm, respectively. The follicle groups found for alpacas were very different from the normal trio of primary follicles found in sheep and goats. The follicle group of the alpacas consisted of a single primary follicle surrounded by a variable number of secondary follicles. The mean ± s.e. primary follicle density was 3.1 ± 0.3 and 2.7 ± 0.1 follicles/mm² for Huacaya and Suri, respectively. The mean ± s.e. secondary follicle density (SFD) was 13.7 ± 1.2 and 17.5 ± 0.6 follicles/mm² for Huacaya and Suri, respectively. The mean ± s.e. ratio of secondary to primary follicles (S/P ratio) was 5.1 ± 0.5 for the Huacaya and 7.3 ± 0.2 for the Suri alpacas. The sheep had higher S/P ratios and SFD, lower MFD and produced significantly heavier fleeces. The key correlations found between traits in alpacas include a negative correlation between SFD and MFD (r = –0.71, P = 0.001) and a negative correlation between S/P ratio and MFD (r = –0.44, P = 0.003) and a positive correlation between S/P ratio and total follicle density (r = 0.38, P = 0.010). The study revealed that important relationships exist between alpaca skin follicle characteristics and fibre characteristics. It was the number of secondary follicles in a group that imparts density and a corresponding reduced MFD.

Additional keywords: fibre curvature, fibre diameter, fibre quality, liveweight, tenacity.

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