Concept:Litter provides dry, warm bedding that protects lambs from cold and damp conditions.
Explanation:Materials like straw are used as litter on the floor of a sheep pen.
Litter absorbs moisture and keeps the floor dry.
A dry floor prevents lambs from lying on cold, wet surfaces.
When lambs are chilled, their resistance is lowered and they become prone to pneumonia.
Therefore, the main purpose of litter in sheep production is to reduce pneumonia in lambs.
Answer:C. reduce the incidence of pneumonia in lambs