The Biological Value of Soybean in Relation to Protein And
THE BIOLOGICAL VALUE OF SOYBEAN IN RELATION TO PROTEIN AND CALCIUM AS REVEALED BY ANIMAL FEEDING • By EVELYN LANE WILLIAMS,, Bachelor of Science Mary Washington College Fredericksburg, Virginia 1941 Submitted to the faculty of the Graduate College of the Oklahoma State Univer~ity in partial fuli1lliilent of the requirements . for the degree of MASTER OF SCIENCE July, 1966 THE BIOLOGICAL VALUE OF SOYBEAN IN RELATION TO PROTEIN AND CALCIUM AS REVEALED BY ANIMAL FEEDING Thesis Approved: ACKNOWLEDGEMENTS The author wishes to express her sincere appreciation to: Dr. Helen F. Barbour; for her counsel, advice, and help in the formulation of the author's graduate program and invaluable assistance in the writing of this thesis and guiding the experimental work. Mr. and Mrs. L.• H. Wagner, wenderful friends, for advice and encouragement. Mrs. Carolyn Hackett for the typing of this .manuscript. Mrs. Alberta Lane, the author's mother for her regular corres pondence and encouragement during the lengtp of this graduate program.• The author wishes also to express her sincere appreciation to her husband, Douglass Williams, and children, Douglass, Judith, and Lane, for their kind forebearance during the time of graduate study and the· preparation of this manuscript. iii TABLE OF CONTENTS Chapter Page I. INTRODUCTION. ~ ·• ·• . ·• .. ' . 1 Statement of the Problem . .. .. 3 Assumptions , , • • O; ., ,o 5 Hypotheses . 5 II. REVIEW OF LITERATURE. 7 History of the Soybean • • • • • • • • • • • • 7 Composition of Protein •• 10 Composition of Soybeans • . , • • • • 14 Enzyme Inhibitors • • • • , • • • • 19 Preparation of Soybean Products. • 22 Biological Value of Soybeans • • • • ••• 27 Determination of Protein Deficiency ••• , • , • , , • 31 Functions of Calcium , , • , , •••••• , • , ••• 32 Determination of Calcium Deficiency 37 The Rat as an Experimental Animal •• 39 III.
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