Depending on the stallion, horse semen is one of the most expensive liquids on the planet. A gallon of gold-medal-winning Big Star's semen is worth $4.7 million. Once it's collected, horse semen is sold in small tubes called straws which can sell for thou

Depending on the stallion, horse semen is one of the most expensive liquids on the planet. A gallon of gold-medal-winning Big Star's semen is worth $4.7 million. Once it's collected, horse semen is sold in small tubes called straws which can sell for thou