The Effect of Gestation on Milk and Buttekfat
THE EFFECT OF GESTATION ON MILK AND BUTTEKFAT PRODUCTION IN DAIRY CATTLE DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By WILLIAM MATHIAS ETGEN, B. S., M. S. The Ohio State University 1958 Approved by Adviser Department of Dairy Science ACKNOWLEDGMENTS I wish to express my sincere appreciation to my adviser and friend, Dr. Thomas M. Ludwick, Professor in the Department of Dairy Science, Ohio State University, and Project Leader of the Ohio NC-2 Dairy Cattle Breeding Project. I am greatly indebted to Dr. Ludwick for the inspiration, time, guidance, and technical assistance in planning this project and editing the manuscript. My sincere thanks are expressed to Dr. Fordyce Ely, Chair man of the Department of Dairy Science, Ohio State University, for his interest in this project and for his help in editing the manuscript. To Dr. George R. Johnson, Chairman of the Department of Animal Science, Ohio State University, I extend my thanks for his reading of the manuscript. I wish to express my appreciation to Dr. D. Ransom Whitney, Professor in the Department of Mathematics and Director of the Statistics Laboratory, Ohio State University, for his assistance in the statistical analysis of this project. Also, I am greatly indebted to Herman Rickard, Earl Rader, Don Richardson, Ervin Akins, Dr. Edwin Hess, Harry Barr, Dr. Harry Donoho, and Dr. C. M. Clifton. These persons have given unsparingly of their time and efforts in all phases of the study. ii CONTENTS PAGE INTRODUCTION........................................... 1 REVIEW OF LITERATURE..................................
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