Concept:Newborn piglets cannot control their body temperature well because they are born with little fat and thin hair.
Explanation:When a sow is about to farrow, a warm farrowing pen should be prepared for her young ones.
Piglets are born with very little subcutaneous fat and a sparse hair coat, so they lose body heat quickly.
Their heat-regulating system is not fully developed at birth, making them very sensitive to low temperatures.
If the piglets become chilled, they become weak and may die from exposure to cold.
Heat lamps or brooders are therefore used to supply warmth during the first weeks of life.
This warmth does not promote hair growth, help the piglets to suckle colostrum, or prevent anaemia.
Hair growth and colostrum intake depend on genetics and nursing behaviour, while anaemia is prevented through iron supplements.
The main reason for providing warmth is to protect the piglets from chilling and to reduce piglet mortality.
Answer:D. Prevent chilling of the young.