firstling

/ˈfɜrstlɪŋ/
noun
  1. The first offspring of an animal, especially a farm animal.
    • The ewe gave birth to a healthy firstling lamb.
    • The farmer was proud of the firstling of his prize cow.
    • In some traditions, the firstling of the flock was offered as a sacrifice.
  2. The first product or result of something.
    • That early painting is a firstling of the artist's mature style.
    • This novel was the firstling of her writing career.
    • The firstling of the new factory was a batch of high-quality steel.