Concept:Newborn piglets cannot regulate body temperature and need external warmth to survive.
Explanation:During farrowing, the sow is kept in a warm environment.
A heat source or warm bedding is provided in the farrowing pen.
Piglets are born with very little body fat.
They lose body heat quickly and are highly susceptible to chilling.
Warmth keeps them comfortable and prevents cold stress in the first critical hours.
It does not directly promote hair growth, colostrum intake, or prevent anaemia.
Answer:D. prevent chilling of the young