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Structure and Synthesis of Milk Fat. III. Utilization of Pentadecanoate Infused into the Lactating Goat Mammary Gland^{1, 2,}

Department of Dairy Science, The Pennsylvania State University, University Park

R. G. Jensen and G. W. Gander

Department of Animal Industries, Storrs Agricultural Experiment Station, University of Connecticut, Storrs

ABSTRACT

Although, blood lipids are precursors for a portion of milk lipids (9), the mechanism involved in this transfer is not known. We have noted recently that there is a difference between bovine blood triglycerides and milk fat triglycerides in the positioning of fatty acids on the glycerol (7). This observation suggests that blood triglycerides, if used in making milk fat, first are broken down or rearranged. Of course, other classes of blood lipids than the triglycerides may be involved as precursors of milk lipids.

In considering one aspect of this problem, we wondered whether structural positioning of a fatty acid in a monoglyceride introduced into the gland would have any bearing on use and ultimate positioning of that fatty acid in milk lipid synthesis. The ease with which simple metabolites, such as C¹⁴ acetate and C⁴ serine, infused into the gland through the teat canal, are incorporated into the milk constituents (8, 10) suggested an interesting approach to the problem.

¹ Authorized for publication October 18, 1961, as Paper No. 2608 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

² Supported in part by the U. S. Public Health Service (H3632).