Limits to sustained energy intake
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IV. Effect of variation in food quality on lactating mice MUS MUSCULUS
J. R. Speakman*,
A. Gidney,
J. Bett,
I. P. Mitchell and
M. S. Johnson
Aberdeen Centre for Energy Regulation and Obesity (ACERO), Department of Zoology, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, UK
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Fig. 1. Changes in daily food intake throughout lactation (day 0 is parturition) in experimental mice fed the low-energy diet from early pregnancy (black symbols, N=15), experimental mice fed the low-energy diet from the first day of lactation (stippled symbols, N=13) and control animals fed the standard diet (white symbols, N=71). Values are means ± S.E.M. Some error bars are smaller than the point dimensions.
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Fig. 2. The difference in food intake between experimental mice fed the low-energy diet from early pregnancy (open squares) or from parturition (filled circles) and control mice throughout lactation. There was a significant increase over time in the difference relative to control mice in the group switched to the low-energy diet at parturition but no change over time in the group switched in early pregnancy.
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Fig. 3. Changes in the ‘general activity’ behaviour of mice fed the low-energy diet (A) from early pregnancy (N=15) and (B) from parturition (N=13). Observations made at night are identified by filled symbols; observations during the day are shown by open symbols. During both times of day, in both groups, the behaviour declined between early pregnancy and late lactation. Each point represents the mean percentage time spent in the behaviour across all mice. Parturition is day 0.
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Fig. 4. Changes in ‘grooming’ behaviour of mice fed the low-energy diet (A) from early pregnancy (N=15) and (B) from parturition (N=13). Observations made at night are identified by filled symbols; observations during the day are shown by open symbols. A significant trend was apparent only for the lactation-onset group at night. Each point represents the mean percentage time spent in the behaviour across all mice. Parturition is day 0.
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Fig. 5. Changes in the ‘feeding’ behaviour of mice fed the low-energy diet (A) from early pregnancy (N=15) and (B) from parturition (N=13). Observations made at night are identified by filled symbols; observations during the day are shown by open symbols. During both phases, and in both groups, the mice increased the amount of feeding behaviour as reproduction progressed. Each point represents the mean percentage time spent in the behaviour across all mice. Parturition is day 0.
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Fig. 6. Changes in the ‘resting’ behaviour of mice fed the low-energy diet (A) from early pregnancy (N=15) and (B) from parturition (N=13). Observations made at night are identified by filled symbols; observations during the day are shown by open symbols. During the day, ‘resting’ time was unchanged, but in both groups at night ‘resting’ increased as reproduction progressed. During lactation, ‘resting’ was also generally accompanied by suckling behaviour in the pups. Each point represents the mean percentage time spent in the behaviour across all mice. Parturition is day 0.
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© The Company of Biologists Ltd 2001
