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This study was carried out with the aim of determining the effect of forage plants belonging to different families on herbage quality and yield with different mixing ratios (Berseem clover:Italian ryegrass; 100:0%, 80:20%, 60:40%, 40:60%, 20:80% and 0:100%). In the study, plant height, green herbage and dry herbage yields, clover ratios in green herbage and dry herbage, crude protein ratio and yield, acid detergent fiber (ADF), neutral detergent fiber (NDF), digestible dry matter (DDM), dry matter intake (DMI) rates and relative feed value (RFV) were investigated in Derya variety of berseem clover (Trifolium alexandrinum L.) belonging to Eastern Mediterranean Agricultural Research Institute and Elif variety of Italian ryegrass (Lolium multiflorum Lam.) obtained from Aegean Agricultural Research Institute. The experiment was carried out with 4 replications according to the randomized blocks trial design in the summer term of 2020 in Bahçekapi village of Elazig city center. According to the study findings; the average green herbage yield of mixtures was found to be 3784.9 kg da-1, dry herbage yield was 1210.8 kg da-1, and crude protein yield was 146.6 kg da-1. Crude protein, acid detergent fiber (ADF), neutral detergent fiber (NDF), digestible dry matter (DDM), dry matter intake (DMI) ratios and relative feed value (RFV) of the mixtures were determined as 12.04%, 35.7%, 50.9%, 61.0%, 2.36%, and 112.15, respectively. As a result of this study; it was determined that the most suitable mixture ratios in terms of dry herbage, green herbage and crude protein yields and crude protein ratio were 80% Berseem clover + 20% Italian ryegrass and 60% Berseem clover + 40% Italian ryegrass mixtures in Elazig ecological conditions. It was observed that the dry herbage, green herbage and crude protein yields and crude protein ratios were higher in the plots where the Berseem clover was more concentrated in the mixtures. [ABSTRACT FROM AUTHOR]