EVOLUZIONE DELLE LESIONI MACROSCOPICHE E MICROSCOPICHE DA WHITE STRIPING NEL BROILER

White striping (WS) is an alteration of broiler muscle characterized by the presence of white striations parallel to the direction of muscle ibers. WS affects mainly heavier birds, and is increasing his economic impact on meat production. To evaluate the evolution of lesions 240 broilers were breed under ield condition and groups of 80 birds were sacriiced at 12, 25 and 51 days. Breast were scored for WS (0=absence, 1=mild, 2=severe) and sampled for histology. Each histological lesion (cell degeneration, presence of adipocytes inside the iber, presence of ibrosis inside the iber, presence of diffused inlammation, presence of vasculitis) was scored and an overall score was create to summarize microscopic alterations. The scores of cells degeneration, presence of adipocytes and ibrosis inside the muscular iber correlates very well, indicating the 3 lesions develops together. Inlammation (both diffused and vasculitis) develops independently from others lesions. The average scores at 12, 25 and 51 days of all parameters, and of macroscopic scores were compared and there was a signiicant difference in all parameters evaluated at different ages, conirming the evolution of lesions along time.