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http://dx.doi.org/10.5333/KGFS.2013.33.4.313

Effect of Subacute Ruminal Acidosis on Plasma Concentrations of Lipopolysaccharide in Dairy Cattle  

Son, Hey In (Korea University, Division of Biotechnology)
Baek, Seong Gwang (Korea University, Division of Biotechnology)
Moon, Ju Yeon (Korea University, Division of Biotechnology)
Ahn, Eui-Young (Korea University, Division of Biotechnology)
Lee, Hyun-Jun (National Institute of Animal Science, RDA)
Son, Yong Suk (Korea University, Division of Biotechnology)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.33, no.4, 2013 , pp. 313-318 More about this Journal
Abstract
A study was conducted to determine if subacute ruminal acidosis (SARA) induced by feeding high level of non-structural carbohydrates results in increases in lipopolysaccharides (LPS) of peripheral blood in dairy cattle. In this experiment four Holstein steers, two of which having ruminal canulae with indwelling probes placed for measuring long term pH changes, were alloted into two dietary treatments in a cross-over design, where an acidogenic diet (AD) was formulated by including high amount of non-structural carbohydrates (NSC) based on corn silage and corn flake as TMR ingredients. Data for ruminal pH change and plasma LPS concentration were compared against normal diet (ND) which contained grass hay as forage and low NSC ingredients. Feeding AD for more than 14 days to animals brought about a pH change as low as less than 5.8 for more than 4 hours, which made good contrast to ND fed animals. Decreased ruminal pH also had an effect on LPS concentrations which showed significantly higher level for AD compared with ND. Therefore, plasma LPS concentration may be used as an effective indicator to verify acidosis whether it is acute or chronic. Na-bentonite and Propylene glycol, which are frequently included in dairy TMR as additives, helped decrease ruminal pH by buffering and then ultimately alleviates SARA. Therefore, it could also be helpful to lower the occurrence of laminitis which is often caused by increased blood endotoxin (LPS) concentration.
Keywords
Holstein steer; Ruminal pH; Subacute ruminal acidosis (SARA); Acidogenic diet; Blood lipopolysaccharide (LPS);
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