Table 1.

Bovine respiratory disease scoring system for pre-weaned dairy calves [9,23].

Diagnose 1	Description of the Clinical Sign	Score if Normal	Score if Abnormal (Any Severity)
ED	Serous, mucous, or purulent eye secretion; uni- or bilateral	0	2
ND	Serous, mucous, or purulent nose secretion; uni- or bilateral	0	4
HAT	slight uni- or bilateral ear droop or head tilt	0	5
CO	impulsive and audible exhalation sound	0	2
AB	Increased breathing frequency, signs of tachypnea	0	2
T		0 (<102.5 °F ≙ <39.2 °C)	2 (≥102.5 °F ≙ ≥39.2 °C)

¹ Physical parameters: CO = cough, ND = nasal discharge, ED = eye discharge, AB = abnormal breathing, HAT = head tilt or ear droop, T = temperature.