Marigolds are great for natural pest repellent. Pyrethrin was actually originally synthesized from marigolds, and permethrin, commonly used to treat chickens from lice and mites, was derived from that.
Marigold extract is also often added to commercial feeds to improve yolk color, such as in Purina's Layena Omega 3 feed.
Marigold extract is also often added to commercial feeds to improve yolk color, such as in Purina's Layena Omega 3 feed.