Light microscopic observations of the ruminal papillae of cattle on diets with divergent forage to cereal ratios

Ferguson, H.J. et al. (2022) Light microscopic observations of the ruminal papillae of cattle on diets with divergent forage to cereal ratios. Animal, 16(3), 100462. (doi: 10.1016/j.animal.2022.100462) (PMID:35180682) (PMCID:PMC8934251)

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High levels of supplementation with cereal increases production rates in cattle but can increase incidence of disease, ranging from mild indigestion to acute ruminal acidosis and death. Therefore, there is motivation to determine biological markers which can be used to identify whether animals have been, or are being fed, sufficient or excessive cereals. This study aimed to describe light microscopic findings from animals being fed diverse dietary cereal proportions and to test the performance of a novel rumen epithelial scoring system. Rumen wall tissue samples were obtained from the abattoir from 195 cattle from 11 Scottish farms and processed for histological examination. Light microscopic examination was used to characterise ruminal epithelial response to dietary challenge. Secondary objectives included describing the distribution of immune-related cells in bovine ruminal epithelium and assessing the use of a modified Elastin Martius Scarlet Blue stain (EMSB) for histological examination of the rumen epithelium. Cells staining positive for cluster of differentiation 3 were distributed mainly in the lower layers of the stratum basale and were found in higher densities in animals offered lower cereal proportion diets. Cells staining positive for major histocompatibility complex class 2 (MHCII) were most common in perivascular locations and in the junction between the lower stratum basale and the propria-submucosa. The density of MHCII positive staining cells was higher in animals on lower cereal diets. The level of supplementation with cereal was also associated with the thickness of the stratum corneum (SCT) and stratum granulosum (SGT), the integrity of the stratum corneum and sloughing of cornified cells. There were no advantages in using EMSB stain over haematoxylin and eosin (H and E) in this scoring system. We concluded that a scoring system that included only SCT, SGT and a measure of the loss of appearance of intercellular space allowed differentiation of groups of animals according to the level of cereal supplementation.

Item Type:Articles
Additional Information:This work was supported by the BBSRC grant (BB/J018120/1) awarded to JRW, IA, CM and NNJ; and the Hannah Dairy Research Foundation PhD scholarship awarded to HJF.
Glasgow Author(s) Enlighten ID:Jonsson, Professor Nicholas and Koh-Tan, Dr Caline and Johnston, Dr Pamela and Ferguson, Dr Holly
Creator Roles:
Ferguson, H.Methodology, Investigation, Formal analysis, Writing – original draft, Writing – review and editing
Koh-Tan, C.Methodology, Investigation, Project administration, Writing – original draft, Writing – review and editing
Johnston, P.Writing – review and editing
Jonsson, N.Conceptualization, Funding acquisition, Methodology, Formal analysis, Investigation, Visualization, Writing – original draft, Writing – review and editing
Authors: Ferguson, H.J., Koh-Tan, H.H.C., Johnston, P.J., Wallace, R.J., Andonovic, I., Michie, C., McCartney, C.A., Strachan, E.M., Snelling, T.J., Harvey, C.D., Thomson, W., and Jonsson, N. N.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Animal
ISSN (Online):1751-732X
Published Online:15 February 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Animal 16(3): 100462
Publisher Policy:Reproduced under a Creative Commons licence
Data DOI:10.5525/gla.researchdata.710

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
167846Sub-acute and acute ruminal acidosis; an interdisciplinary approach to understand and prevent a multifactorial disease.Nicholas JonssonBiotechnology and Biological Sciences Research Council (BBSRC)BB/J018120/1Institute of Biodiversity, Animal Health and Comparative Medicine