Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1971 A study of calving interval Alfonso Guillermo Flores Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Agriculture Commons, and the Animal Sciences Commons Recommended Citation Flores, Alfonso Guillermo, "A study of calving interval " (1971). Retrospective Theses and Dissertations. 4452. https://lib.dr.iastate.edu/rtd/4452 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact
[email protected]. 72-5200 FLORES, Alfonso Guillermo, 1929- A STUDY OF CALVING INTERVAL. Iowa State University, Ph.D., 1971 Agriculture, animal culture University Microfilms, A XEROX Company, Ann Arbor, Michigan THIS DISSERTATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED A Study of calving interval by Alfonso Guillermo Flores A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subject: Animal Science (Animal Breeding) Approved: Signature was redacted for privacy. In Charge of Major Work Signature was redacted for privacy. For the Major^Department Signature was redacted for privacy. Iowa State University Ames, Iowa 1971 PLEASE NOTE: Some Pages have Indistinct print. Filmed as received. UNIVERSITY MICROFILMS TABLE OF CONTENTS INTRODUCTION REVIEW OF LITERATURE Fertility Traits in General Calving Interval Postpartum Interval Conception Length Gestation Length Summary of the Reviewed Literature SOURCE OF DATA Source of Data METHODS OF ANALYSIS RESULTS AND DISCUSSION Analysis of Proportions Analyses of Reproductive Traits Analysis I Analysis II SUMMARY AND CONCLUSIONS LITERATURE CITED ACKNOWLEDGMENTS iii LIST OF TABLES Page Table 1.