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J. Dairy Sci. 2008. 91:202-207. doi:10.3168/jds.2007-0535
© 2008 American Dairy Science Association ®
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Ruminal Temperature May Aid in the Detection of Subacute Ruminal Acidosis

O. AlZahal*, E. Kebreab{dagger}, J. France*, M. Froetschel{ddagger} and B. W. McBride*,1

* Centre for Nutritional Modeling, Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
{dagger} National Centre for Livestock and Environment, Department of Animal Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
{ddagger} Edgar L. Rhodes Center for ADS, University of Georgia, Athens 30602

1 Corresponding author: bmcbride{at}uoguelph.ca

The objective of this study was to investigate the relationship between ruminal pH and ruminal temperature and to develop a predictive equation that can aid in the diagnosis of subacute ruminal acidosis (SARA). Six rumen-fistulated lactating Holstein dairy cows (639 ± 51 kg body weight) were used in the study. Cows were randomly allocated to 1 of 2 dietary treatments: control (% of dry matter, 40% corn silage, 27% mixed haylage, 7% alfalfa hay, 18% protein supplement, 4% ground corn, and 4% wheat bran) or SARA total mixed ration (% of dry matter, 31% corn silage, 20% mixed haylage, 5% alfalfa hay, 15% protein supplement, 19% ground wheat, and 10% ground barley) and were fed daily at 0700 and 1300 h. The experiment consisted of 1 wk of adaptation followed by 1 wk of treatment. Ruminal pH and ruminal temperature were simultaneously and continuously recorded every minute for 4 d per week using the same indwelling electrode. Subacute-acidotic cows spent more time (min/d) below ruminal pH 5.6 and a greater time above 39.2°C than control cows. Ruminal pH nadir had a negative relationship with its corresponding ruminal temperature (R2 = 0.77). Therefore, ruminal temperature may have potential to predict ruminal pH and thus aid in the diagnosis of SARA.

Key Words: dairy cow • subacute ruminal acidosis • ruminal pH • ruminal temperature




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