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Background and Objectives Most utilized grains in livestock feeding in Egypt are imported from abroad, therefore searching for alternative feed ingredients to replace of high cost feed grains is very important approach. This research aimed to investigate the effects of partial replacement of corn grains by Powdered Date Seeds PDS or PDSfibrolytic enzymes on the productive performance of Rahmani rams and lactating Nubian goats. Materials and Methods For digestibility trial, three mature Rahmani rams were randomly assigned to the experimental rations Control 0 PDS, R1 50 of corn of the control replaced by PDS, R2 50 of corn of the control replaced by PDS 2 g Asperozym kg1501 DMI using 33 Latin square design. For lactation trial, twenty seven lactating Nubian goats randomly assigned into three groups of nine animals each to the experimental rations using complete random design. The entire experimental periods for digestibility and lactation trials were 63 days. Rams and goats were fed dry matter according to 4 of their body weight and water was offered freely. Data were statistically analyzed by SAS Version 8 software. Results Rams fed R1 recorded the lowest values of ruminal fermentation characteristics except pH and nutrients digestibility coefficients. No significant differences were found between R2 and control rams in all tested ruminal fermentation characteristics except pH and all nutrients digestibility coefficients except CF digestibility. There were no significant differences among all groups in plasma total protein, globulin, urea, ALT, AST and cholesterol concentrations. Milk, 4 FCM and all milk constituents yields except SNF yield were higher p0.05 for control and R2 goats than R1 goats. Conclusion The replacement of 50 of corn grains by enzymatically treated powdered date seeds had no negative effect on rumen fermentation and nutrients digestibility of Rahmani rams, as well as Nubian goat146s milk production and its component146s yields.

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