Fig. 4From: Bovine respiratory syncytial virus outbreak reduced bulls’ weight gain and feed conversion for eight months in a Norwegian beef herdWeight to age ratio in two groups of bulls, year versus year comparison. Comparison of bulls without a diagnosis of respiratory disease monitored in the test centre during 2011 (Year 1) versus 2012 (Year 2). Respiratory disease outbreak date in 2011 is denoted by vertical line Back to article page