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Updated: Apr 19, 2026

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High follicle density does not decrease sweat gland density in Huacaya alpacas.

K E Moore1, S K Maloney2, D Blache1

  • 1UWA Institute of Agriculture (Animal Production), University of Western Australia, 35 Stirling Highway, Crawley, 6009 Western Australia, Australia.

Journal of Thermal Biology
|December 21, 2014
PubMed
Summary
This summary is machine-generated.

Alpacas with finer, denser fleeces have more sweat glands. This indicates high follicle density in alpacas is not a limitation for their heat-evaporative sweating ability.

Keywords:
AlpacaFibreSP ratioThermoregulation

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Area of Science:

  • Animal Science
  • Dermatology
  • Physiology

Background:

  • Mammals, including alpacas, lose heat through evaporative cooling via sweating or panting.
  • Alpacas, unlike sheep, are believed to rely more on sweating for thermoregulation, even with their dense fleece.
  • Selection for finer alpaca fiber may impact follicle density and sweat gland distribution.

Purpose of the Study:

  • To investigate the relationship between fiber characteristics and sweat gland density in Huacaya alpacas.
  • To determine if selection for finer fleece affects the alpaca's potential for evaporative heat loss.
  • To assess the correlation between follicle density and sweat gland number in alpacas.

Main Methods:

  • Skin biopsies and fiber samples were collected from 33 Huacaya alpacas.
  • Skin sections were analyzed to quantify total, primary, and secondary follicle counts.
  • Sweat gland duct numbers and mean fiber diameter were measured.

Main Results:

  • Alpacas with finer fibers exhibited significantly higher total follicle density (P<0.001).
  • Finer-fibred alpacas also possessed a greater number of sweat glands (P<0.001).
  • A strong negative correlation was found between fiber diameter and total follicle density (R²=0.56, P<0.001).

Conclusions:

  • Alpaca selection for finer fleece is associated with increased follicle density.
  • Higher follicle density in alpacas correlates with a greater number of sweat glands.
  • Alpacas with high follicle density are not limited in their sweating capacity for thermoregulation.