CONTENTS XXV 



VII. Lipid Distribution in Specific Tissues and in Their Secretions (continued) 



7. Lipids Present in the Spleen 770 



8. Lipids Present in the Reproductive Organs 771 



(1) Lipids in the Testes 771 



(2) Lipids in the Ovaries 772 



a. The Lipid Composition of Resting Ovaries 772 



b. The Lipid Composition of the Ovaries as Related to the Estrus 



Cycle 772 



c. The Lipid Composition of the Ovaries as Affected by Pregnancy. 773 



(3) Lipids in the Uterine Mucosa 774 



(4) Lipids in the Placenta 775 



9. Lipids Present in the Skin and Its Appendages 776 



( 1 ) General Distribution of the Lipids 776 



a. Cholesterol and Other Sterols in the Skin 777 



b. Phospholipids in the Skin 780 



c. Waxes in the Skin 780 



d. Triglycerides in the Corium 781 



e. Free Fatty Acids in the Skin 781 



(2) Lipids Present in the Hair and Other Appendages •. 782 



(3) Lipids Present in the Sebum 784 



10. Lipids Present in Lung Tissue 787 



11. Lipids Present in the Pancreas 788 



12. Lipids Present in Bone-Marrow 789 



13. Lipids Present in the Stomach and Intestine 789 



14. Lipids Present in Milk Fat 791 



(1) The Composition of Milk Fat 791 



a. Fatty Acids in Milk Fat 791 



b. Phospholipids in Milk Fat 792 



c. Cholesterol in Milk Fat 792 



(2) Factors Altering the Composition and Amount of Milk Fat 794 



a. Species Variations in Milk Fat 794 



b. Colostrum vs. Mature Milk Fat 795 



c. Seasonal Changes in the Composition of Milk Fat 796 



d. The Effect of Hormones on Milk Fat 797 



(3) The Origin of the Milk Lipids 798 



a. Dietary Fat as a Source of Milk Fat 798 



b. Blood Lipids as a Source of Milk Fat 801 



c. Synthesis of Milk Fat in the Udder from Small Molecules 803 



(a) Carbohydrate as a Source of Milk Fats 803 



(b) Acetate as a Source of Milk Fat 804 



a'. Proof of the Synthesis of Milk Fat from Acetate Based 



upon the Respiratory Quotient of Mammary Gland 



Slices 805 



b'. Proof of the Synthesis of Milk Fat from Acetate Based 



upon Experiments with Acetate Containing C 14 806 



c'. Proof of the Synthesis of Milk Fat from Acetate Based 



upon in vivo Experiments 806 



