Why do kunekune pigs have wattles

Overview

Kunekune pigs, a small domesticated breed originating from New Zealand, are distinguished by their unique wattles—fleshy appendages that hang from their lower jaws. The breed's name comes from the Māori word meaning "fat and round," accurately describing their compact, barrel-shaped bodies that typically weigh 120-240 pounds. Kunekunes were developed in the early 1800s through crossbreeding between pigs brought by European whalers and settlers and possibly Asian breeds introduced by traders. These pigs nearly became extinct in the 1970s, with only about 50 purebred animals remaining before conservation efforts by Michael Willis and John Simister revived the breed. Today, kunekunes are popular worldwide for small-scale farming and as pets due to their gentle temperament, grazing habits, and distinctive appearance featuring wattles, short legs, and a variety of coat colors including black, brown, ginger, cream, and spotted patterns.

How It Works

Wattles in kunekune pigs are specialized skin structures composed of connective tissue, blood vessels, and a small amount of muscle tissue. These appendages develop during embryonic growth through specialized folding of the skin in the mandibular region, similar to how other skin appendages form. The primary physiological function involves thermoregulation: blood vessels within the wattles dilate to increase blood flow and surface area for heat dissipation in warm conditions, while constricting to conserve heat in cooler temperatures. Wattles may also serve communicative purposes during social interactions, as their movement and position could signal emotional states or intentions to other pigs. Unlike some wattle structures in other animals, kunekune wattles contain no significant glandular tissue and are not directly involved in scent marking or pheromone production. Their presence is genetically determined through multiple genes influencing skin development and is maintained through selective breeding practices that favor this distinctive trait.

Why It Matters

The wattles of kunekune pigs matter for several practical and conservation reasons. For breeders and farmers, wattles serve as an important breed identification marker, helping maintain genetic purity in breeding programs—especially crucial given the breed's near-extinction in the 1970s. The thermoregulatory function of wattles contributes to the breed's adaptability to various climates, supporting their global distribution to over 20 countries including the United States, United Kingdom, and Australia. In agricultural settings, this temperature regulation helps kunekunes thrive in pasture-based systems, reducing heat stress during summer months. Additionally, the distinctive appearance created by wattles enhances the breed's appeal in heritage farming and pet markets, supporting conservation through economic viability. Research on kunekune wattles also contributes to understanding skin appendage development in mammals, with potential applications in veterinary science and comparative anatomy studies.