There's a bit of missing information in the manual pertaining all Chickens.

• No mention of feeding by trough.
• No mention of the need for water.
• No mention of drinking water from trough or world.
• No mention of needing to be happy in order to lay eggs
  • Proposed change For the hens to be able to lay eggs, they need a nest in close range and have all of their basic needs met
• All chickens other then Leghorn are prime meat chickens but don't mention their regular drops.