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Ruminal acidosis and the rapid onset of ruminal parakeratosis in a mature dairy cow: a case report

Show simple item record Steele, Michael A. AlZahal, Ousama Hook, Sarah E. Croom, Jim McBride, Brian W. 2010-10-04T18:18:53Z 2010-10-04T18:18:53Z 2009-10
dc.identifier.citation Steele et al. (2009) Acta Veterinaria Scandinavica 51:39 en
dc.identifier.other doi:10.1186/1751-0147-51-39
dc.description.abstract A mature dairy cow was transitioned from a high forage (100% forage) to a high-grain (79% grain) diet over seven days. Continuous ruminal pH recordings were utilized to diagnose the severity of ruminal acidosis. Additionally, blood and rumen papillae biopsies were collected to describe the structural and functional adaptations of the rumen epithelium. On the final day of the grain challenge, the daily mean ruminal pH was 5.41 ± 0.09 with a minimum of 4.89 and a maximum of 6.31. Ruminal pH was under 5.0 for 130 minutes (2.17 hours) which is characterized as the acute form of ruminal acidosis in cattle. The grain challenge increased blood beta-hydroxybutyrate by 1.8 times and rumen papillae mRNA expression of 3-hydroxy-3-methylglutaryl-coenzyme A synthase by 1.6 times. Ultrastructural and histological adaptations of the rumen epithelium were imaged by scanning electron and light microscopy. Rumen papillae from the high grain diet displayed extensive sloughing of the stratum corneum and compromised cell adhesion as large gaps were apparent between cells throughout the strata. This case report represents a rare documentation of how the rumen epithelium alters its function and structure during the initial stage of acute acidosis. en
dc.language.iso en en
dc.publisher Acta Veterinaria Scandinavica en
dc.relation.ispartofseries 51;
dc.subject ruminal acidosis; ruminal parakeratosis; dairy cow
dc.title Ruminal acidosis and the rapid onset of ruminal parakeratosis in a mature dairy cow: a case report en
dc.type Article en

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