A yak with stinky feet.

Ammonia in Yak Foot Odor • What is it? A pungent, colorless gas made of nitrogen and hydrogen. • Why is it involved? As yaks walk through silage, waste, or moist barn areas, microbial breakdown of organic matter (especially urea or proteins) can lead to the release of ammonia near the hooves. • How it smells? Sharp, sour, and eye-watering — exactly the kind of smell that would earn a big, dramatic “PU!” from your yak. • Visual effect? In your universe, it could appear as black wisps, swirling from wet hooves after swimming or sweating.

Corynebacterium & Yak Foot Odor • Habitat: Commonly found in moist, warm areas like between a yak’s toes, where toe gunk builds up. • Action: These bacteria break down sweat lipids into volatile fatty acids like: • Isovaleric acid (cheesy) • Butyric acid (rancid butter) • Acetic acid (vinegary) • Result: A potent mix of barnyard funk, often enhanced by silage, manure particles, and cracked hooves. The smell manifests as those black swirling odor wisps we’ve seen in your art. • Smell Profile: Cheesy 🧀 + Sour milk 🥛 + Dirty hay 🐾 = “PU!”

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Yak foot odor

Bacteria:

• Staphylococcus epidermidis.
• Corynebacteria.
• Brevibacteria.
• Pseudomonas aeruginosa.
• Actinomyces bacteria.

Fungi:

• Candida albicans.
• Trichophyton mentagrophytes.
• Aspergillus niger.

Chemical compounds:

• Isovaleric acid.
• Acetic acid.
• Butyric acid.
• Ammonia.
• Methanethiol.
• Dimethyl disulfide.