الفهرس 
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Abstract
A total of 24 Egyptian buffalo calves was used in this study at 711 months of age and 197(R+(B12.09 kg LBW. The experimental animals were divided into similar three groups according to LBW and age. All animals were fed concentrate feed mixture (CFM), berseem hay (BH) and rice straw (RS). The 1st group was fed CFM, BH and RS (control ration G1), and the 2nd (G2) and 3rd (G3) groups were fed the control diet supplemented with yeast culture (20 and 30 g YC (Gustor nature)/h/d, respectively). Buffalo calves in all groups were fed the experimental diet from 8 up to conception. LBW, ADG, feed conversion, digestibility coefficients, rumen and blood parameters were determined. Also, LBW and age at puberty, 1st service and conception as well as ovarian activity and progesterone concentration were studied. Addition of YC resulted in marked improvement in digestibility of most nutrients and nutritive values as TDN and DCP value of experimental diets. Also, TVFA<U+2019>s concentration, protozoa count and microbial yield increased by YC supplementation. Overall mean of concentration of total proteins, albumin, globulin and AL/GL ratio as well as concentrations of total cholesterol were not affected by YC supplementation, however, concentration of total lipids increased (P>0.05). Supplementation of YC resulted in heavier LBW and early age at puberty, 1st service and conception. Also, oestrous and ovarian activity was more pronounced prepuberty and post puberty in heifers fed diets supplemented with YC. The present study concluded addition of 20 g YC/day in diets to attained early puberty of buffalo heifers.