Veterinary and Biomedical Sciences, Department of

School of Veterinary and Biomedical Sciences: Dissertations, Theses, and Student Research
First Advisor
Brian L. Vander Ley
Date of this Version
5-2025
Document Type
Thesis
Citation
A thesis presented to the faculty of the Graduate College at the University of Nebraska in partial fulfillment of requirements for the degree of Master of Science
Major: Veterinary Science
Under the supervision of Professor Brian L. Vander Ley
Lincoln, Nebraska, May 2025
Abstract
Neonatal calf health is an important factor in the productivity and profitability in the beef cattle industry, influencing preweaning survival, growth, and long-term performance. The overall objective of this thesis is to characterize risk factors that contribute to health issues in young beef calves. The first objective is to review literature exploring the environmental factors affecting preweaning morbidity and mortality, including hypothermia, precipitation, and wind. Management strategies such as the effect of environmental conditions of calving location, body condition score in dams at parturition, and the impacts of dystocia on calf health will also be discussed. Gaps in current research surrounding this topic are highlighted. The second objective is to test the hypothesis that calves exposed to harsher environmental conditions at birth (i.e. lower average temperature, freezing temperatures, precipitation, mud, and/or snow) will have increased odds of illness compared to those born in more moderate conditions. To accomplish the second objective, cow-calf producers from across Nebraska were asked to record environmental conditions during calving and provide health treatment records for three calving seasons. Statistical analysis was performed on each herd independently. Snow was significantly associated with illness in Herd A. Average temperature was significantly associated with illness in Herd D. The association between birth year and calf illness was significant in Herd F. Days from the start of calving season was significant in Herd B, Herd E, and Herd F. There were no significant associations observed between all variables tested and calf illness in Herd C (p > 0.05). These findings highlight that due to confounding between environmental and management factors, effectiveness of calf health interventions varies by operation and should be evaluated locally.
Advisor: Brian L. Vander Ley
Included in
Beef Science Commons, Large or Food Animal and Equine Medicine Commons, Nutrition Commons
Comments
Copyright 2025, Lindsay L Waechter-Mead. Used by permission