: Sites like Freesound.org or Pixabay Music offer a wide variety of field recordings. These are great if you need "organic" sounds, such as a cow grazing or a distant moo in a pasture.
: Dedicated SFX sites like Zapsplat or SoundBible have specific categories for animal sounds where you can preview and download MP3 or WAV files instantly. Common Uses for Cow Sounds skachat zvuki mychanie korovy
: Enhancing presentations or apps for children to help them identify farm animals. : Sites like Freesound