This study amid to investigate the effect of using sugar beet pulp (SBP) untreated or treated with biological treatments to replace about 30% of common concentrate feed mixture of goat diets. In vitro experiment was carried out to study the effect of control, treated and untreated SBP on nutrients disappearance. Experimental diets included T1: Concentrate feed mixture (CFM) + Berseem hay (BH) (control). T2: CFM + untreated SBP + BH. T3: CFM + SBP treated with Sacharomyces cerevisiae + BH. T4: CFM + SBP treated with Clostridium cellulovorans + BH. T5: CFM + SBP treated with Trichoderma harzianum + BH. Thirty five female Barki goats (about 4 years old and weighing 30±1.5 kg) were randomly divided into five groups fed the experimental diets. The experimental period lasted 270 day to study the effect treatments on goat doe performance during pregnancy and lactation stages and their kids performance until weaning. A digestibility trial was carried out at the third month of pregnancy. The results revealed that biological treatments significantly (P≤0.05) increased body weight and feed intake. Also, biological treatments significantly (P≤0.05) improved chemical composition, digestibility coefficients, nitrogen balance, water balance, rumen fermentations, milk yield and composition, birth and weaning weight. It could be concluded that, inclusion of untreated or biologically treated SBP to replace 30% of common concentrate feed mixture of during pregnancy and lactation stages had remarkable improved influence on goat performance.