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Effects of an immunomodulatory feed additive on the development of mastitis in a mouse infection model using four bovine-origin isolates

Published online by Cambridge University Press:  22 September 2010

A. D. Rowson ,
Y.-Q. Wang ,
E. Aalseth ,
N. E. Forsberg  and
S. B. Puntenney
A. D. Rowson
Affiliation:
OmniGen Research, LLC. 1767 NW Kings Blvd. Corvallis, OR 97330, USA
Y.-Q. Wang
Affiliation:
OmniGen Research, LLC. 1767 NW Kings Blvd. Corvallis, OR 97330, USA
E. Aalseth
Affiliation:
Dairy Consulting 6514 113th Avenue NE, Lake Stevens, WA 98258, USA
N. E. Forsberg*
Affiliation:
OmniGen Research, LLC. 1767 NW Kings Blvd. Corvallis, OR 97330, USA
S. B. Puntenney
Affiliation:
OmniGen Research, LLC. 1767 NW Kings Blvd. Corvallis, OR 97330, USA
*
†E-mail: [email protected]
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Abstract

The goal of this study was to examine the ability of a commercially available feed additive (OmniGen-AF) to reduce mammary infections caused by a single strain of mastitic pathogens (Streptococcus uberis, Escherichia coli, Staphylococcus aureus and Klebsiella pneumoniae) and to examine the effects of the additive on markers of mammary immunity. Four experiments were completed using a murine model of bovine mastitis. Infection progression was examined using Sybr-green- and TaqMan-based quantitative PCR assays of 16S ribosomal DNA. Infection of the mammary gland with all pathogens caused rapid (24 to 48 h) appearance of pathogen DNA in mammary tissue. Provision of the feed additive for 2 weeks before infection significantly (P < 0.05) reduced the extent of pathogen DNA accumulation in models of S. uberis, E. coli and S. aureus infection. The additive was ineffective in reducing mammary infections caused by K. pneumoniae. We examined mechanisms of action of the additive through assessment of mammary concentrations of mammary myeloperoxidase (MPO), major histocompatibility complex 2 class II (MHC) and macrophage inflammatory protein-1α (MIP) messenger RNA (mRNA) concentrations and by examining serum complement C3 concentration. Infection of the mammary gland increased concentrations of MPO and MHC mRNAs (P < 0.05). Ability of the pathogen to elicit changes in mammary MPO and MHC gene expression was enhanced by the provision of the additive for 2 weeks before infection. These data imply that the additive increased the mammary inflammatory response and increased antigen presentation during a mammary infection. Value of the additive in preventing mastitis in cattle awaits additional studies using a bovine model and further evaluation of additional strains of the pathogens used in this study.

Keywords

mastitisimmunitymurineOmniGen-AF
Type
Full Paper
Information
animal , Volume 5 , Issue 2 , February 2011 , pp. 220 - 229
Copyright
Copyright © The Animal Consortium 2010

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