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The aim of this study was to investigate milk yield, milk composition and  rumen activity of Zaribi does and performance of their newly born kids when were fed different silage mixtures.Eighteen Zaribi dairy goats showing healthy were divided into three similar groups (6 animal each ) with average body weight 39.87kg and nearly 30-36 months of age, every  kids with their dams (average BW 3.60 kg). All animals were fed concentrate feed mixture (CFM) to cover 40 % of requirements recommended by NRC (1981). Besides ad libitum berseem silage offered to R1, silage of berseem x Raygrass for R2 and silage of berseem x Rodgrass for R3.The experiment lasted for 120 day.Nutrient digestibility and nutritive value were determined by digestibility trials.The obtained results of saponine residues in rations, milk, feces,urine and rumen liquor showed that there significantly (P<0.05) higher with R1 group of all parameters than other tested groups. Moreover,feed intake of R2 and R3 groups were significantly(P<0.05) higher compared with R1.As for digestion coefficients the results were revealed that all nutrients digestibility were increased gradually with R2 and R3 in comparison of R1.But no differences were observed of feed intake and digestion coefficients between R2 and R3 groups . Addition to Water consumption recorded lower values with R2 and R3 groups than control(R1). Ruminal pH , VFAۥs and ammonia-N concentrate were recorded the highest values at 3 hrs post feeding.Molar proportion of ruminal volatile fatty acid (VFA′s) found that there variations between acetic, propionate, butrtate and Iso-Biotrate values and the R2 results showed that there significant (p< 0.05) decrease in  acetic , butrtate and  iso-biotrate than those of R1 and R3,as same time the propionate and valerate were gave higher value with R2 group. Milk production as affected experimental rations showed that there were significant differences (p<0.05) in milk composition among the different tested groups. And the daily milk yield of R2 and R3 were significantly (p<0.05) higher than R1.Data of kids BWG sucking their mother milk illustrated that R2 and R3 groups were significantly (p<0.05) increased compared to those in R1 group. Thereafter the second group was recorded higher value of  the total viable bacteria count than first and third groups.Economical efficiency of kids body gain , milk yield of  dairy Zaribi goats based upon the differences in both growth rate and total cost.The corresponding values of the economical efficiency were 100%,123% and 119% for R1, R2 and R3 respectively.

COMPARITIVE STUDY ON DIFFERENT MIXTURES OF SILAGES ON MILK PRODUCTION , RUMEN AVTIVITY AND PERFORMANCE OF BORN KIDS IN DAIRY ZARIBI GOATS .