Degree Type

Thesis

Date of Award

2020

Degree Name

Master of Science

Department

Veterinary Diagnostic and Production Animal Medicine

Major

Veterinary Preventative Medicine

First Advisor

Terry Engelken

Abstract

A cohort study was conducted in a population of crossbred feeder steers at a commercial feedlot in central Iowa. This study assessed the relationship between Whisper® lung scores taken at feedlot arrival and feeding performance and health performance. Lung scores were taken at initial processing along with individual weights. Feeding performance outcomes included average daily gain (ADG), feed efficiency (FE), hot carcass weight (HCW), dressing percentage (DRESS), marbling score (MARB), fat thickness (FAT), and ribeye area (REA). Health outcomes included treatment for BRDC (RTX), death due to BRDC (RD), being diagnosed with chronic BRDC (RC), and dying after treatment for BRDC (RCF). A causal diagram was used to inform model building for linear and logistic regression models.

DOI

https://doi.org/10.31274/etd-20200902-47

Copyright Owner

Jenna Funk

Language

en

File Format

application/pdf

File Size

63 pages

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