Abstract
1. Experiments were conducted with lambs to determine the correlation between food intake, rate of glucose incorporation into CO2 and lipids, and rate of lipid mobilization by their isolated omental adipocytes.
2. During the interval between weaning and slaughter average daily dry matter (ADDM) intakes of the individual lambs were significantly correlated with average daily gains; however, the ratio of ADDM intake to body wt.¾ was similar in all individuals.
3. The average size of adipocytes for each lamb, as determined by lipid: protein ratios, was not significantly correlated with food intake.
4. Oxidation of glucose to CO2 and the total measured glucose incorporation by the adipocytes were significantly and negatively correlated with lamb ADDM intakes at low levels of glucose (0·1 mg/ml.), whereas rates of lipogenesis from glucose were similar for all intake levels.
5. Insulin-induced increases in glucose utilization were positively and significantly correlated with ADDM intakes to the extent that insulin had over twice the effect on the adipocytes from high-intake lambs as it had on those from low-intake lambs. The minimum effective dose of insulin necessary to significantly increase glucose utilization by the adipocytes was also positively and significantly correlated with the ADDM intakes of the lambs.
6. Basal NEFA release rates were higher for adipocytes from low-intake lambs. Epinephrine significantly increased NEFA release rates, independent of lamb intakes.
7. A larger number of adipocytes in the high-intake lambs means that they would have a greater total potential to lower blood glucose, particularly when they are under the effects of normal circulating levels of insulin. The amount of glucose removed from the glucose pool could be the feed-back signal which results in a high long-term food intake.
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Selected References
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