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This research paper presents the results obtained based on a study on the impact of crossing the Svrljig pramenika and East Friesian sheep breed on the milk protein content and yield in the F1 generation of crossbreeds in the course of lactation. In all the three sheep breeds, while the difference between the first and last lactation months was of exceptionally high significance. The average protein content in the milk yielded by the East Friesian sheep and crossbreeds is very similar and amounts to 5.32% and 5.37%, while in the Svrljig Pramenka it was 5.53%. Based on the statistical significance appraisal of the differences in mean values of protein content in each stated breeds for the whole lactation period a highly significant difference between the Svrljig Pramenka and East Friesian sheep (p 0.05). The crossing of the stated breeds had an impact on the increase in the total yield of milk protein in the hallfbreeds (5948.72g), which is an increase of 1755.36g compared with that in the Svrljig Pramenka, and a decrease of only 237.36g in relation to that in the East Friesian sheep breed.

Impact of crossing of Svrljig pramenka with East Friesian sheep on change in milk protein content