About the Authors

D. Enette Larson-Meyer

Contributed equally to this work with: D. Enette Larson-Meyer, Bennett C. Ingold, Samanta R. Fensterseifer, Kathleen J. Austin, Brenda M. Alexander

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Writing – original draft, Writing – review & editing

enette@uwyo.edu

Affiliation Department of Family and Consumer Sciences (Human Nutrition), University of Wyoming, Laramie, Wyoming, United States of America

Bennett C. Ingold

Contributed equally to this work with: D. Enette Larson-Meyer, Bennett C. Ingold, Samanta R. Fensterseifer, Kathleen J. Austin, Brenda M. Alexander

Roles Data curation, Formal analysis, Writing – original draft

Affiliation Department of Family and Consumer Sciences (Human Nutrition), University of Wyoming, Laramie, Wyoming, United States of America

Samanta R. Fensterseifer

Contributed equally to this work with: D. Enette Larson-Meyer, Bennett C. Ingold, Samanta R. Fensterseifer, Kathleen J. Austin, Brenda M. Alexander

Roles Data curation, Investigation

Affiliation Department of Animal Science, University of Wyoming, Laramie, Wyoming, United States of America

Kathleen J. Austin

Contributed equally to this work with: D. Enette Larson-Meyer, Bennett C. Ingold, Samanta R. Fensterseifer, Kathleen J. Austin, Brenda M. Alexander

Roles Data curation, Formal analysis

Affiliation Department of Animal Science, University of Wyoming, Laramie, Wyoming, United States of America

Perry J. Wechsler

Roles Data curation, Formal analysis, Methodology

‡ These authors also contributed equally to this work.

Affiliation Department of Atmospheric Science, University of Wyoming, Laramie, Wyoming, United States of America

Bruce W. Hollis

Roles Data curation, Formal analysis, Resources

‡ These authors also contributed equally to this work.

Affiliation Department of Pediatrics, Medical University of South Carolina, Charleston, South Carolina, United States of America

Andrew J. Makowski

Roles Data curation, Formal analysis, Resources

‡ These authors also contributed equally to this work.

Affiliation Heartland Assays, Ames, Iowa, United States of America

Brenda M. Alexander

Contributed equally to this work with: D. Enette Larson-Meyer, Bennett C. Ingold, Samanta R. Fensterseifer, Kathleen J. Austin, Brenda M. Alexander

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Resources, Supervision, Writing – original draft, Writing – review & editing

Affiliation Department of Animal Science, University of Wyoming, Laramie, Wyoming, United States of America

Competing Interests

Serum and tissue vitamin D analyses were conducted by Heartland Assays (Ames, IA) who were blinded for treatment group. Bruce W. Hollis and Andrew J. Makowski at Heartland Assays provided the analytical services for fee. Andrew J. Makowski wrote the methods section for the LCMSMS analysis and Bruce W. Hollis assisted with the discussion. This does not alter our adherence to PLOS ONE policies on sharing data and materials.