Weaning in rats: I. Maternal behavior.

@article{Cramer1990WeaningIR,
  title={Weaning in rats: I. Maternal behavior.},
  author={Catherine P. Cramer and Edda Thiels and Jeffrey R. Alberts},
  journal={Developmental psychobiology},
  year={1990},
  volume={23 6},
  pages={
          479-93
        }
}
Maternal behavior during the weaning period (postpartum Days 14-35) was described from continuous timelapse videorecordings of Norway rat dams and their litters. Time spent nursing declined steadily after Day 20 but persisted until Day 34, about a week longer than suggested by reports of milk transfer. Most of the decline in nursing was due to progressively fewer nursing bouts per day; milk letdowns per day were consequently diminished. Although a private feeding chamber was available to the… 

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TLDR
The results suggest that the transition from milk to solid food is embedded in a multitude of behavioral changes that have distinct temporal characteristics and the developmental period between Days 14 and 34 can be divided into three phases.
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TLDR
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