الفهرس 
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Abstract
This study was carried out at ElGemmizah experimental Station in cooperation with Faculty of Agriculture <U+2013> Mansoura University. The current study aimed to study the effects of yeast culture (Gustor nature) supplementation (20g/h/d) in diets of lactating buffalo cows one month prepartum and 6 months postpartum on milk yield and milk composition and evaluation of reproductive performance of buffalo cows. A total of 21 lactating of buffalo cows aged was 46 years between 24 parities. Buffalo cows were assigned to three groups ( 7 animals in each). The control group was fed concentrate feed mixture (GFM), berseem nay (BH), corn silage (CS) and rice straw (RS). While, the !st group (G1) was fed the control diet but was supplemented with yeast culture (YC, 20 g/h/d) and the 2nd one (G2) was fed the same diet of G1 with mineral mixture (MM, 35 g/h/d). Results indicated that the CP content of CFM markedly increased by about 7.8% when it was supplemented with YC and slightly increased by about 4.2% with YC+MM supplementation compared with the control CFM. Digestibility coefficient of CP significantly (P<0.05) increased in YC or YC+MM diets than the control diet, while digestibility coefficient of DM, OM, CF, EE and NFE did not differ significantly. Ruminal pH values were significantly (P<0.05) lower and concentration of VFA?S was significantly (P<0.05) in buffalo cows fed dietary treatments. However, concentration of NH3N was not affected significantly by treatments. Total protein and globulin concentration in blood plasma significantly (P<0.05) increased in buffalo fed YC+ MM than those fed YC alone or control diet, while concentration of glucose was significantly (P<0.05) lower in buffalo fed YC alone or control diets than those fed YC+MM. Average daily milk yield as actual yield of fat corrected milk (4%) was significantly (P<0.05) higher in buffalo cows fed dietary treatments than the control. Milk fat percentage was significantly (P<0.05) lower in control buffaloes than those fed dietary treatments. Milk feed efficiency significantly (P<0.05) increased in buffaloes fed dietary treatments. Economic efficiency (%) relative to control increased by about 46% and 43.5% in G1 and G2. Average postpartum first ovulation interval significantly (P<0.05) decreased in buffaloes fed YC+MM than in control buffaloes and those fed YC alon by about 10 and 9 days. However, postpartum first estrous and service intervals, service period length and number of service per conception, number of days open and calving interval did not differ significantly among dietary groups. Generally, buffalo cows fed YC alone showed the best results concerning milk production and reproductive and economic efficiencies.