Diurnal cycle of mother-young contact in Norway rats☆

Leon, Michael; Adels, Lori; Coopersmith, Robert; Woodside, Barbara

doi:10.1016/0031-9384(84)90292-0

Cited by 26 publications

(10 citation statements)

References 25 publications

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“…It could be argued that the present analysis of maternal behaviour is limited, because, and in contrast to other studies (Champagne et al 2003), it is based on a single observation at a single time point during lactation. However, pups are heavily dependent on the mother around that time (Pachon, McGuire, and Rasmussen 1995) and dams show a particular high intensity of maternal behaviour during the light phase (Leon et al 1984;Grota and Ader 1969;Ader and Grota 1970). In addition, some exposure time to enrichment would be required to exert any effect at all.…”

Section: Discussionmentioning

confidence: 99%

The impact of early postnatal environmental enrichment on maternal care and offspring behaviour following weaning

Lund

Voigt

2016

Behavioural Processes

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Section: Discussionmentioning

confidence: 99%

The impact of early postnatal environmental enrichment on maternal care and offspring behaviour following weaning

Lund

Voigt

2016

Behavioural Processes

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“…The mechanism is unknown, but cannot be a simple neural circuit since rats do not suckle and eat at the same time. Indeed, there is an asynchrony in that while rats suckle their young throughout the day and night, the peak period is during the first half of the light period [20,32], whereas they consume about 70 % of their food at night [16 ± 19]. It is possible that some region of the hypothalamus (perhaps the PVN) or elsewhere in the brain collates the suckling signals over a period and then adjusts appetite accordingly.…”

Section: Hyperphagia Of Lactation: the Role Of Leptinmentioning

confidence: 99%

Leptin and the Adaptations of Lactation in Rodents and Ruminants

Vernon¹,

Denis²,

Sørensen³

et al. 2002

Horm Metab Res

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Lactation markedly increases nutrient requirements in both rodents and ruminants. This is met mostly by increased food intake, but there are also adaptations to increase metabolic efficiency. Despite such changes, lactating animals usually experience periods of negative energy balance. This is not due to a physical constraint on food intake, at least in the rat. Leptin, a hormone secreted by adipocytes, plays an important role in the regulation of appetite and energy balance. During lactation, serum leptin concentration is decreased in both rodents and ruminants, and the nocturnal rise in concentration is lost in rats. Hypoleptinaemia in lactation is primarily a result of negative energy balance. There is also increased clearance of serum leptin, and the attenuation of the nocturnal rise in leptin in rats is at least partly due to the suckling stimulus. Hypoleptinaemia is not the major factor driving hyperphagia in lactating rats, but it probably facilitates the increased food intake. Leptin may play a more important role in this respect in lactating ruminants. Leptin is probably involved in other adaptations that increase metabolic efficiency during lactation. The ability of hypothalamic neuropeptides to respond to leptin does not appear to be altered by lactation in either rodents or ruminants. The reason why lactating animals do not respond to hypoleptinaemia with a further increase in appetite, thereby achieving energy balance, appears to be due to a failure to respond to changes in neuropeptides which mediate the effects of leptin.

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“…The temperature of lactating rats has a diurnal cycle, with the peak occurring during the night and the trough occurring during the day (Leon, Adels, Coopersmith, & Woodside, 1984). Mother rats also have long been known to have a daily cycle in the amount of time that they spend with their young.…”

Section: Control Of the Chronically High Maternal Heat Loadmentioning

confidence: 99%