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Some Sources of Variation in Total Plasma Cholesterol Levels in Dairy Cattle¹

New Jersey Agricultural Experiment Station, Sussex

ABSTRACT

The assay of total plasma cholesterol has gradually become recognized as another adjunct in the estimation of thyroid activity, although it is less reliable than more direct measures, such as plasma protein-bound iodine and radioactive-iodine techniques. Numerous workers (6, 7, 9,16) have shown that hyperthyroidism results in hypocholesterolemia; whereas, high levels of total plasma cholesterol are observed in the hypothyroid animal.

The normal level of total plasma cholesterol in dairy cattle has been reported by Boyd (4) to be 110 mg. %. Several investigators have studied normal levels of total plasma cholesterol due to age (20, 22, 24), pregnancy and lactation (2, 14, 18, 20), and diet (17). Parturition has been found by Long et al. (11) to result in a 20% decrease in plasma concentration of total cholesterol.

Fluctuations in blood levels of total cholesterol have been studied by several workers, in dairy calves (13) and humans (3, 5, 23), and have failed to detect significant diurnal or daily variation.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, the State University of New Jersey, Department of Dairy Industry, New Brunswick. This research was supported in part by Research and Marketing Funds (Sec. 10b) of the Agricultural Research Service, Dairy Husbandry Research Branch, USDA.