Title : CULTURAL MANAGEMENT PRACTICES AND PREVALENCE OF ECTOPARASITES IN SEMI FREE~RANGE PATEROS DUCKS IN CONCEPCION, TARLAC Researcher : RALPH LORENZE R. JAVIER School : Pampanga State Agricultural University, Magalang, Pampanga Degree : Bachelor of Science in Biology Date Completed : February 27, 2018 Adviser : Ma. Socorro C. Tuazon A cross sectional study was conducted from January to February 2018 to identify and estimate prevalence of ectoparasites of Pateros ducks in commercial and traditional/backyard poultry farms at Concepcion, Tarlac. Eighty ducks were collected as a study sample. 60 ducks were from commercial farms and 20 ducks from traditional/backyard farms. Ectoparasites were collected from different parts of the body including skin scraping. This study showed a total number of 140 ectoparasites were collected from 80 Pateros ducks in two selected poultry farms in Concepcion, Tarlac. Four ectoparasite species were identified, namely: Oxylipeurus spp., Lipeurus spp., Menopon spp., and Cuclotogaster spp. Out of the total ducks examined, 54/80 was found to be positive for the presence of ectoparasites. The prevalent ectoparasite species in commercial ducks was Lipeurus spp. (31.67%) followed by Cuclotogaster spp. (28.33%), Menopon spp. (11.67%), and Oxylipeurus spp. (10%), respectively. While in traditional/backyard ducks, the prevalent parasites were Oxylipeurus spp. (50%) and Lipeurus spp. (50%) followed by that of Menopon" spp. (5%), and Cuclotogaster spp. (5%) as well. This study indicated that prevalence of ectoparasite infestation is high in traditional/backyard ducks as compared to commercial ducks, which is associated with poor hygienic system. There is a need to improve hygiene to increase poultry productivity in the area.