Abstract
Statistically analyzed 5226 records for factors preparated pneumonia incidence which were parity , year and season of incidence with 2046 records refer to total milk production (TMP) and location period (LP) were collected during 1998 to 2001 on Holstein cows at Al-Nasr Dairy Cattle Station near to Al-Soueria . The over all mean for the % of pneumonia among cows was 10.73% and affected high significantly by parity, year and season. The over all mean ± SE for TMP was 4198.75 ± 24.45 kg which significantly (p
