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Effects of Feeding, Fasting and Environmental Temperature upon Blood Plasma Lipid Levels of Swine¹

Michigan Agricultural Experiment Station, East Lansing

Abstract

Four trials were conducted with pigs to ascertain the effects of temperature, controlled feeding and fasting upon plasma lipid levels. An apparent diurnal variation indicated that maximum lipid levels occurred in the early morning hours. However, this was later shown to be due to temperature, with lower readings resulting in elevated lipid levels, whereas, higher temperatures resulted in lower plasma lipid levels. There was no significant difference in plasma lipid levels between fasted pigs and those given a constant feed intake. However, the lipid levels for the fasted pigs were higher than for fed pigs at the termination of both trials. Within 8 hours after allowing normal feed intake following a 48-hour fasting period, there was a significant reduction in blood lipid levels. Results indicate the importance of controlled environmental conditions in studies involving blood plasma lipid measurements.

¹ Journal Article 3030, Michigan Agricultural Experiment Station, East Lansing.

² Department of Animal Husbandry.

³ Department of Food Science.

⁴ Department of Physiology and Pharmacology.