The research was conducted to evaluate the productive and reproductive performances of crossbred and Deshi dairy genotypes and to find out the possible scope of seed bull production through a farmer participatory approach. The available dairy genotypes were Deshi ( D), 50% Holstein Friesian (HF) - 50% D (50% HF), 62.5% HF-37.5% D (62.5% HF), 50% Sahiwal (SL)-50% D (50% SL) and H-SL-D. The results indicated that there were highly significant differences (P<0.001) in daily milk yield, peak daily milk yield, lactation length, dry period, and moderate significant differences (P<0.01) in age at first heat, age at first service and had no significant effect (P>0.05) in age at first calving, calving interval, post-partum heat period and services per conception among available genotypes. The 75 % HF and H-SL-D genotypes produced significantly more daily milk yield ( 13.91±0.91 and 15.06±3.00 lit., respectively) compared to 50% HF, 62.5% HF genotypes (10.07±0.54 and 12.44±0.70lit., respectively), whereas Deshi cow gave 2.32±0.14 liters daily. The 75% HF had the highest peak daily milk yield (17.61±0.89 lit.) followed by H-SL-D, 62.5% HF, 50% HF, 50% SL, and Deshi genotypes (16.71±3.11, 15.29±0.70, 12.51±0.53, 4.75±0.53, 3.60±0.22 lit., respectively). The 75% HF had the highest lactation length (306.09±11.41 days). But there were no significant differences found in lactation length among the 62.5% HF, H-SL-D, and the 50% SL genotypes (283.85±16.24, 290.00±22.80, and 255.00±18.57 days, respectively), whereas Deshi cows had 242.73±8.89 days. The shortest dry period (54.90±3.05 days) was found in 75% HF genotypes. The shortest average age at first heat was found in 75% HF (24.23±2.07months) cows followed by H-SL-D, 50% HF, 62.5% HF, Deshi, and 50% SL cows (25.00±5.57, 25.29±1.58, 29.60±2.90, 32.00±0.65, and 33.00±1.34 months, respectively). The shorted length of age at first service was found in 75% HF (25.86±2.01 months) followed by 50% HF, 62.5% HF, Deshi, and 50% SL cows having 26.10±1.55, 26.10±1.55, 32.31±0.73, and 33.17±1.42 months, respectively. The mean value for age at first calving of crossbred and Deshi cows were 37.6±1.20 and 41.13 ± 0.72 months, respectively. The shortest calving interval (13.14±0.36 months) was found in the case of 62.5% HF cows followed by 75% HF, Deshi, 50% HF, H-SL-D, and 50% SL cows (13.31±0.27, 13.47±0.19, 13.70±0.40, 13.89±1.09, 14.17±0.48 months, respectively). The shortest post-partum heat period was found in 75% HF (88.95±6.89 days) cows followed by 50% HF, 62.5% HF, Deshi, H-SL-D, 50% SL cows (93.72±5.66, 94.38±7.87, 108.08±7.16, 120.00±28.72, 134.63±16.27 days, respectively). The present study concludes that due to the level of performance of animals and farmers' awareness and interest, herd book-based farmers’ participatory system may work here to produce proven sire to support smallholder dairying in Bangladesh.