Comparison of Milk Production Traits by Istrian Pramenka between Conventional and Organic Systems in Slovenia

Th e aim of the present study was to determine diff erences of amount and composition of milk between conventional and organic systems in Istrian pramenka breed of sheep. Sum of the data included 838 conventional and 9238 organic samples of eweś milk. Each farm is classifi ed as organic from the date of entering in organic production. Before that date farms didń t show characteristics of organic production, therefore they were classifi ed as conventional. Th e results of the present study included higher amount of morning (353.10 g) and evening milk (361.39 g) in conventional compared to morning (342.76 g) and evening milk (345.69) in organic system, signifi cantly infl uenced by number of lactation (P<0.001), breeding system and breeder interaction (P<0.001). Higher content of fat in conventional system was signifi cantly infl uenced by breeding system (P<0.05), breeding system and breeder interaction (P<0.001), number of lactation (P<0.01) and lactation length (P<0.001). Lower protein content in conventional system was infl uenced signifi cantly by breeding system and breeder interaction (P<0.001), litter size (P<0.05) and lactation length (P<0.001). Content of lactose was higher in organic system (3.93%) compared to conventional system (3.84%) signifi cantly infl uenced by breeding system (P<0.01) and number of lactation (P<0.001). According to results, diff erences between conventional and organic systems are the mostly infl uenced by breeder in Slovenia.