Evaluation of reticuloruminal pH measurements from individual cattle: sampling strategies for the assessment of herd status

Nicholas N. Jonsson, Joachim L. Kleen, R. John Wallace, Ivan Andonovic, Craig Michie, Marianne Farish, Malcolm Mitchell, Carol-Anne Duthie, Dan B. Jensen, Matthew J. Denwood

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The application of pH observations to clinical practice in dairy cattle is based on criteria derived primarily from single time-point observations more than 20 years ago. The aims of this study were to evaluate these criteria using data collected using continuous recording methods; to make recommendations that might improve their interpretation; and to determine the relationship between the number of devices deployed in a herd and the accuracy of the resulting estimate of the herd-mean reticuloruminal pH. The study made use of 815,475 observations of reticuloruminal pH values obtained from 75 cattle in three herds (one beef and two twice-daily milking herds) to assess sampling strategies for the diagnosis of sub-acute rumen acidosis (SARA), and to evaluate the ability of different numbers of bolus devices to accurately estimate the true herd-mean reticuloruminal pH value at any time. The traditional criteria for SARA provide low diagnostic utility, the probability of detection of animals with pH values below specified thresholds being affected by a strong effect of time of day and herd. The analysis suggests that regardless of time of feeding, sampling should be carried out in the late afternoon or evening to obtain a reasonable probability of detection of animals with pH values below the threshold level. The among-cow variation varied strongly between herds, but for a typical herd, if using reticuloruminal pH boluses to detect a predisposition to fermentation disorders while feeding a diet that is high in rapidly fermentable carbohydrates, it is recommended to use a minimum of nine boluses.
LanguageEnglish
Pages26-32
Number of pages7
JournalThe Veterinary Journal
Volume243
Early online date14 Nov 2018
DOIs
Publication statusPublished - 1 Jan 2019

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Animals
Sampling
Beef
Dairies
Carbohydrates
Nutrition
Fermentation

Keywords

  • acidosis
  • bolus
  • diagnosis
  • reticulorumen

Cite this

Jonsson, Nicholas N. ; Kleen, Joachim L. ; Wallace, R. John ; Andonovic, Ivan ; Michie, Craig ; Farish, Marianne ; Mitchell, Malcolm ; Duthie, Carol-Anne ; Jensen, Dan B. ; Denwood, Matthew J. / Evaluation of reticuloruminal pH measurements from individual cattle : sampling strategies for the assessment of herd status. 2019 ; Vol. 243. pp. 26-32.
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Jonsson, NN, Kleen, JL, Wallace, RJ, Andonovic, I, Michie, C, Farish, M, Mitchell, M, Duthie, C-A, Jensen, DB & Denwood, MJ 2019, 'Evaluation of reticuloruminal pH measurements from individual cattle: sampling strategies for the assessment of herd status' vol. 243, pp. 26-32. https://doi.org/10.1016/j.tvjl.2018.11.006

Evaluation of reticuloruminal pH measurements from individual cattle : sampling strategies for the assessment of herd status. / Jonsson, Nicholas N.; Kleen, Joachim L.; Wallace, R. John; Andonovic, Ivan; Michie, Craig; Farish, Marianne; Mitchell, Malcolm; Duthie, Carol-Anne; Jensen, Dan B.; Denwood, Matthew J.

Vol. 243, 01.01.2019, p. 26-32.

Research output: Contribution to journalArticle

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T2 - sampling strategies for the assessment of herd status

AU - Jonsson, Nicholas N.

AU - Kleen, Joachim L.

AU - Wallace, R. John

AU - Andonovic, Ivan

AU - Michie, Craig

AU - Farish, Marianne

AU - Mitchell, Malcolm

AU - Duthie, Carol-Anne

AU - Jensen, Dan B.

AU - Denwood, Matthew J.

PY - 2019/1/1

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AB - The application of pH observations to clinical practice in dairy cattle is based on criteria derived primarily from single time-point observations more than 20 years ago. The aims of this study were to evaluate these criteria using data collected using continuous recording methods; to make recommendations that might improve their interpretation; and to determine the relationship between the number of devices deployed in a herd and the accuracy of the resulting estimate of the herd-mean reticuloruminal pH. The study made use of 815,475 observations of reticuloruminal pH values obtained from 75 cattle in three herds (one beef and two twice-daily milking herds) to assess sampling strategies for the diagnosis of sub-acute rumen acidosis (SARA), and to evaluate the ability of different numbers of bolus devices to accurately estimate the true herd-mean reticuloruminal pH value at any time. The traditional criteria for SARA provide low diagnostic utility, the probability of detection of animals with pH values below specified thresholds being affected by a strong effect of time of day and herd. The analysis suggests that regardless of time of feeding, sampling should be carried out in the late afternoon or evening to obtain a reasonable probability of detection of animals with pH values below the threshold level. The among-cow variation varied strongly between herds, but for a typical herd, if using reticuloruminal pH boluses to detect a predisposition to fermentation disorders while feeding a diet that is high in rapidly fermentable carbohydrates, it is recommended to use a minimum of nine boluses.

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