Association between clinical respiratory signs, lung lesions detected by thoracic ultrasonography and growth performance in pre‐weaned dairy calves

Table 4 Multivariable linear regression model for calf pre-weaning average daily gain

Variable	Estimate average daily gain (kg)	SE	P-value
Intercept	0.87	0.09	< 0.001
Clinical BRD^a
-	Referent
+	-0.04	0.03	0.20
TUS30^b
TUSS1	Referent
TUSS2	0.02	0.03	0.44
TUSS3	-0.03	0.04	0.50
TUSS4	-0.12	0.04	0.01
Breed^c
HF	Referent
HF × AA	0.04	0.05	0.50
House^d
FV	Referent
NV	-0.07	0.05	0.16

^aBovine respiratory disease.
^bClassification of calves considering the ultrasound evaluations performed up to day 30. For more detail regarding thoracic ultrasound score (TUSS) from 1 to 4 see details on material and method section.
^cBreed: HF, Holstein Frisian; HF × AA, Holstein Frisian × Aberdeen Angus.
^dHouse: FV, fan ventilated; NV, naturally ventilated.

ISSN: 2046-0481