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A study to evaluate performance of Friesian crosses with Sudanes (Kenana x Friesian) dairy cattle was cerried out in central Sudan condetions in tow herds at tow dairy farms (Kenana company, and ELbshaier dairy farms). A sample of 128 records (90+38 from Kenana and Elbashaier dairy farms respectively) were studied for the performance of different blood levels on milk production, days in milk, calving interval, age at lactation and lactation number. Analysis of variance, correlations, regressions and mean separation utilizing "Duncan" were done in version 9(SPSS) computer program.The results showed that the overall mean lactation yield (kg), days in milk and calving interval were: 3603.4±127 kg, 317.3±8 days and 420.3±8 days respectively. Mean lactation milk yield was highest in 75% blood level (4724.1 kg).On the other hand, Mean milk yield for: 25%, 37.5%, 50%, 62.5%, 75%, 87.5%, and 100% were: 2497.7, 3302.0, 3508.4, 2657.0, 4724.0, 4362.3, and 3507.5 kg respectively. There were significant (P < 0.01) differences between means of milk yield, days in milk, and calving interval in the tow farms Kenana and Elbashaier respectively. Blood level, herd, lactations and their interactions had a significant (P < 0.05) effect on milk production. Also blood level had a significant (P < 0.01) effect on days in milk, and the mean days in milk for 25%, 37.5%, 50%, 62.5%, 75%, 87.5%, and 100% were: 354.0, 291.0, 307.0, 298.6, 339.9, 302.5, and 377.0 days respectively. Milk yield was affected by: herd, lactation and blood level, but there was a positive significant (P < 0.05) correlation between milk yield and blood level. Mean calving interval for 25%, 37.5%, 50%, 62.5%, 75%, 87.5%, and 100% were: 466.0, 454.0, 395.7, 382.9, 445.7, 401.0, and 416.8 (days) respectively.