The present study included three experiments, first one was allotted to Cerealine; second for Phosphorine; and the third for Microbine under different levels. Sandy and clay soils were used to access the different features of such interactions involved in the experiment regarding the studied characteristics. Two sources of N-fertilizers were used, viz., ammonium nitrate (AN) and ammonium sulphate (AS) along with superphosphate in combinations with the studied biofertilizers. In Cerealine experiment, in both soils (the clay and sand), inoculation increased straw yield particularly where the high rate of inoculation was used. The results show that grain yield increased by inoculation. The increase was marked in the sand soil. In the clay soil inoculation increased grain yield, particularly in absence of N. The effect of interactions between Cerealine, N-sources and rates was highly significant as regards to N-uptake by plants in the clay and sand soils and the greatest value of N-uptake was obtained from the clay soil. In Phosphorine experiment, in the clay soil, inoculation caused a decrease on the straw yield where no P or low or high rates of P was applied, but in the sand soil, the positive effect of inoculation occurred in presence of the low P-rate. Values of grain yield obtained by application of Phosphorine in the clay soil showed an increase only where P was either not applied or applied at the high rates, but in the sand soil inoculation with Phosphorine caused an increase only where no-P, or where the low rate of P was present. Uptake of N increased by inoculation in the clay soil. This increase was particularly significant in grains and where P was applied at low and medium rates. Also in the sand soil, uptake of N increased by inoculation. This was considerable in grains, and where P was not applied, or applied at low to medium rates. In Microbine experiment, in the clay soil, data indicate that treating the seeds with the low level of Microbine (7.1 g/kg seeds) gave the better results of straw yield than the high level (14.2 g/kg seeds) particularly under conditions of AS + SP. In the sand soil, inoculation increased straw yield under all conditions of mineral fertilization. Results of the grains yield show positive effect of inoculation by Microbine in both soils and under mineral fertilization of no mineral fertilization. Regarding N-uptake, in both soils, the high rate of Microbine gave higher N-uptake by grains than with the lower rate. In straw, the same trend was observed in the clay soil. In the sand soil, the higher N-uptake was observed with the lower rate of Microbine. 1. Pregnant cows were higher significantly (P2. Season of year (sampling), parity and daily level of milk yield on milk flow, peak milk flow, milking duration and milk yield, were highly significant (P3. Milk flow and peak milk flow were significantly higher (P4. Milk flow in the first parity, peak milk flow in the second parity and milking duration and milk yield in the fifth parity were significantly (P5. The first level (11.0 kg) of average daily milk yield in the herd showed the highest (P6. Birth of male calves was accompanied with the highest (P7. Single births were accompanied with the highest (PAnoestrus due to galactorrhea in imported Holstein Friesian cows and its improvement, in Egypt1. The body weight and age at first service differed insignificantly between normal and anoestrous cows.2. Length at the 1st, 2nd and 3rd lactations and the post-partum period were significantly (P3. The correlation coefficient values between post-partum period and body weight at first service, were negatively significant (P4. Cervical mucus ferning, glycogen, inorganic phosphate, water, sodium, potassium and zinc values were significantly (P5. Treatment of anoestrus cows with different doses of Bromocriptine increased ferning, glycogen, inorganic phosphate, water, sodium, potassium and zinc values, but decreased spin-barkeit, ER and pH in anoestrous cows.6. Incidence of conception in anoestrous cows at a rate of 76.5% (13/17) after administration of 75 µg/kg body weight Bromocriptine indicates that such injection prevented the metabolic disorders.Diseases1. The vaccination must be regarded as an aid in the prevention of the diseases.2. The mastitis infections showed highly in the year 1993 than the year 1994 and the percentages of scour infections was 31.0% and respiratory infections 3.0% in a sample of dairy calves.