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Pathogens 2017, 6(4), 66; https://doi.org/10.3390/pathogens6040066

Feed Intake and Weight Changes in Bos indicus-Bos taurus Crossbred Steers Following Bovine Viral Diarrhea Virus Type 1b Challenge Under Production Conditions

1
Department of Animal Science, Texas A&M University, College Station, TX 77843, USA
2
Department of Agriculture, Angelo State University, San Angelo, TX 76909-0888, USA
3
Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843, USA
4
Elanco Animal Health, Larchwood, IA 51241, USA
5
USDA-ARS National Animal Disease Center, Ames, IA 50010, USA
6
Ridpath Consulting, LLC, Gilbert, IA 50105, USA
7
Texas A&M AgriLife Extension, College Station, TX 77843, USA
8
Texas A&M AgriLife Research, College Station, TX 77843, USA
*
Author to whom correspondence should be addressed.
Received: 2 December 2017 / Revised: 7 December 2017 / Accepted: 8 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Bovine Viral Diarrhea virus)
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Abstract

Bovine viral diarrhea virus (BVDV) has major impacts on beef cattle production worldwide, but the understanding of host animal genetic influence on illness is limited. This study evaluated rectal temperature, weight change and feed intake in Bos indicus crossbred steers (n = 366) that were challenged with BVDV Type 1b, and where family lines were stratified across three vaccine treatments of modified live (MLV), killed, (KV) or no vaccine (NON). Pyrexia classification based on 40.0 °C threshold following challenge and vaccine treatment were investigated for potential interactions with sire for weight change and feed intake following challenge. Pyrexia classification affected daily feed intake (ADFI, p = 0.05), and interacted with day (p < 0.001) for ADFI. Although low incidence of clinical signs was observed, there were marked reductions in average daily gain (ADG) and cumulative feed intake during the first 14 day post-challenge; ADG (CV of 104%) and feed efficiency were highly variable in the 14-day period immediately post-challenge as compared to the subsequent 14-day periods. A sire × vaccine strategy interaction affected ADFI (p < 0.001), and a sire by time period interaction affected ADG (p = 0.03) and total feed intake (p = 0.03). This study demonstrates that different coping responses may exist across genetic lines to the same pathogen, and that subclinical BVDV infection has a measurable impact on cattle production measures. View Full-Text
Keywords: BVDV; Nellore-Angus; rectal temperature; vaccination; morbidity; feedlot performance BVDV; Nellore-Angus; rectal temperature; vaccination; morbidity; feedlot performance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Runyan, C.A.; Downey-Slinker, E.D.; Ridpath, J.F.; Hairgrove, T.B.; Sawyer, J.E.; Herring, A.D. Feed Intake and Weight Changes in Bos indicus-Bos taurus Crossbred Steers Following Bovine Viral Diarrhea Virus Type 1b Challenge Under Production Conditions. Pathogens 2017, 6, 66.

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