Abstract
Clinical scoring systems have been proposed for respiratory disease diagnosis in calves, including the Wisconsin (WI) system (McGuirk in 2008) which uses five clinical signs, each partitioned into four levels of severity. Recently, we developed the California (CA) bovine respiratory disease (BRD) scoring system requiring less calf handling and consisting of six clinical signs, each classified as normal or abnormal. The objective of this study was to estimate the on-farm agreement between the WI and the CA scoring systems. A total of 100 calves were enrolled on a CA dairy and assessed for BRD case status using the two scoring systems simultaneously. The Kappa coefficient of agreement between these two systems was estimated to be 0.85, which indicated excellent agreement beyond chance. The simpler design and reduced calf handling required by the CA BRD scoring system may make it advantageous for on-farm use.
Highlights
Bovine respiratory disease (BRD) is an important disease of calves that leads to reduced weight gain and productivity (Waltner-Toews et al, 1986; Warnick et al, 1997; Donovan et al, 1998)
We developed a BRD scoring system for pre-weaned dairy calves based on a matched case–control study of 2030 Holstein calves on a large calf ranch in the San Joaquin Valley, California (CA) (BRD3 scoring system; Love et al, 2014)
The CA BRD scoring system is based on the presence or absence of six clinical signs, each assigned a model-based score (Appendix 1)
Summary
Bovine respiratory disease (BRD) is an important disease of calves that leads to reduced weight gain and productivity (Waltner-Toews et al, 1986; Warnick et al, 1997; Donovan et al, 1998). Several clinical scoring systems have been proposed, including the Wisconsin (WI) system (McGuirk, 2008) that uses five clinical signs, each partitioned into four levels of severity. We developed a BRD scoring system for pre-weaned dairy calves based on a matched case–control study of 2030 Holstein calves on a large calf ranch in the San Joaquin Valley, California (CA) (BRD3 scoring system; Love et al, 2014). The CA BRD scoring system is based on the presence or absence of six clinical signs, each assigned a model-based score (Appendix 1). The objective of this study was to estimate the
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