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- W2149476103 abstract "In juvenile and mature animals, the plasma concentration of leptin is regulated by adiposity and nutrition. However, the timing of these influences on plasma leptin, and their relative importance in early postnatal life, are unknown. We investigated these plasma leptin influences in sheep, a species characterized during fetal life by leanness and insensitivity of leptin to variation in maternal nutrition. Small and large neonatal lambs were randomly assigned to either a diet sustaining an average daily weight gain (ADG) of 148 g/d (Low plane) or ate ad libitum a diet sustaining an ADG of 337 g/d (High plane). A subset of animals were slaughtered at 7.5, 10, 15 and 20 kg of body weight. Birth size had no effect on plasma leptin concentrations and adiposity at birth or at later times. Plasma leptin concentrations increased within 6 d of birth in the High plane lambs (P < 0.01) and continued to rise over time. In contrast, plasma leptin concentrations never changed in the Low plane lambs despite increasing adiposity. The positive association between plasma leptin concentration and adiposity was greater in the High plane than in the Low plane lambs, suggesting an independent effect of nutrition. Consistent with this finding, lipid accretion rates, a variable that is mostly independent of adiposity, was a strong predictor of plasma leptin concentrations only in the High plane lambs (R2 = 0.77, P < 0.01). A positive association between plasma insulin and leptin developed over time in the High plane lambs (R2 = 0.75, P < 0.01 on d 40), but was not seen in the Low plane lambs. These data indicate that both nutrition and adiposity regulate plasma leptin synthesis in early postnatal life, but in contrast to adulthood, the effects of nutrition appear to be predominant." @default.
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- W2149476103 date "2003-12-01" @default.
- W2149476103 modified "2023-10-03" @default.
- W2149476103 title "Plasma Leptin Is Regulated Predominantly by Nutrition in Preruminant Lambs" @default.
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- W2149476103 doi "https://doi.org/10.1093/jn/133.12.4196" @default.
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