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Effects of Various Diets on the Diurnal Patterns of Blood Plasma Lipides of Dairy Calves^{1, 2,}

Department of Animal Industry, North Carolina State College, Raleigh

ABSTRACT

Numerous investigations have been conducted to ascertain the physiological responses of calves to various lipides that have been considered as potential substitutes for milk fat in the diet. Concentrations of blood-plasma lipides of calves fed different fats and oils vary widely, depending on many factors, among which are the particular kind of fat or oil fed and the time of collecting the blood in relation to the time of feeding. Barker and Jacobson (2) observed that plasma fat of calves fed reconstituted milk containing crude soybean oil, hydro-genated soybean oil, or butter oil increased to a maximum level during the first 6 hours after feeding and subsequently receded to the initial level. Huff (13), on the other hand, found that the plasma fat of calves fed a semi-synthetic milk containing hydrogenated cottonseed oil rose to an initial peak at 1 hour after feeding, declined, increased to a second peak by the ninth hour, and subsequently receded to the initial level.

¹ Approved by the Director of Research for publication as Paper No. 571 in the Journal Series.

² Part of the data presented in this paper is from a thesis submitted by the senior author, a Ralston Purina Research Fellow, to the graduate faculty of North Carolina State College in partial fulfillment of the requirements for the degree of Master of Science in the field of Animal Nutrition.