The present study was carried out for prediction of first lactation 305-day milk yield (FL305DMY) using monthly test-day milk yield records of 466 crossbred cattle calved from 2000 - 2018 maintained at Directorate of Livestock Farms, GADVASU, Ludhiana were utilized. The best single, two, three and four test day combinations were selected for prediction of FL305DMY based on adjusted R2 and RMSE values. The equation: Y = 827.38+ 49.58*36D+ 66.49*96D+ 112.51*186D was identified as best (R2=74.91%) for predicting the 305-day milk yield based on monthly test day milk (early test days were selected without compromising much on accuracy). It was concluded that the combination of 2nd, 4th and 7th monthly test days can aid in making culling decisions and used for early genetic evaluation of HF crossbred sires based on progeny performances.