Nature's food anticipatory experiment: entrainment of locomotor behavior, suprachiasmatic and dorsomedial hypothalamic nuclei by suckling in rabbit pups

Jan 25, 2008The European journal of neuroscience

How Suckling Trains Movement and Brain Clock Areas in Rabbit Babies

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Abstract

Rabbit pups demonstrate food anticipatory activity with nursing occurring once daily for fewer than 5 minutes.

  • Nursing visits by dams occur during both the dark and light phases, with specific timing affecting pup behavior.
  • Pups show increased locomotor activity before nursing, indicating anticipation of feeding.
  • In the master circadian clock region (SCN), protein levels of PER1 and FOS are elevated at night, particularly in pups fed at night.
  • The dorsomedial hypothalamic nucleus (DMH) shows peak PER1 expression 8 hours after feeding, linked to the timing of nursing.
  • Comparison of nursed and fasted pups reveals fewer PER1-positive cells in the fasted group, suggesting the impact of nursing timing on neural activity.

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