Date Available
4-27-2018
Year of Publication
2018
Degree Name
Master of Science (MS)
Document Type
Master's Thesis
College
Agriculture, Food and Environment
Department/School/Program
Animal and Food Sciences
First Advisor
Dr. Joao H. C. Costa
Abstract
Heat stress abatement is a challenge for producers in the United States, especially in the southern states. Dairy producers could benefit by having a simply metric to measure heat stress abatement strategies with the goal of motivating improvement in heat stress management. Managing heat stress is key to ameliorating the effects on dairy cow performance. A study was performed to explore the use of a heat stress metric called the Summer to Winter performance ratio (S:W ratio), to quantify and compare farm performance variables among regions of the United States. Summer to Winter ratios were closest to 1.0 in the northern regions and furthest from 1.0 in the southern regions for all performance variables other than milk fat and protein percentage. This suggests that summer performance varies by region and shown using the S:W ratio. A second study compared S:W ratios among Southeast states and then applied the performance ratio to heat abatement strategies in Southeast states. The S:W ratio varied by performance measure and heat abatement strategies but tended to be best for herds implementing cow cooling strategies. The studies in this thesis demonstrated S:W ratios can identify heat stress differences by region and heat abatement strategies by herds.
Digital Object Identifier (DOI)
https://doi.org/10.13023/ETD.2018.123
Recommended Citation
Guinn, Jenna M., "COMPARING DAIRY FARM PERFORMANCE AND HEAT STRESS ABATMENT STRATEGIES IN THE UNITED STATES USING SUMMER TO WINTER RATIOS" (2018). Theses and Dissertations--Animal and Food Sciences. 87.
https://uknowledge.uky.edu/animalsci_etds/87
