Fig. 1.
(a) Full initial and (b) final path models describing causes of post-weaning mortality (PWM) in 42 PCV2-infected farms in Spain. Note that the coefficient β1,2 means the path coefficient from the latent variable number 1 (farm type) to latent variable number 2 (farm management). Solid arrows represent positive influences whereas dashed arrows represent negative influences. Viral evidence of infection was studied by serological analysis. ADV, Aujeszky's disease virus; PRRSV, porcine reproductive and respiratory syndrome virus; SIV, swine influenza virus.