This study was undertaken to determine the suitability of different genotypes of crossbred cattle in Khumaltar Research Farm. Lactational milk yield was significantly affected by the genotypes (p<0.001). The least square means of milk yield of 75% Brownswiss was the highest (2631.6?152 kg.) followed by 75% Ayreshire ( 2478?318 kg.) and 75% Jersey (1945.9?131 kg.). The 50% Ayreshire yielded 2163?95 kg. milk followed by 50% Holstein (1882?86 kg.) and 50% Jersey (1796?136 kg.). 50% Brownswiss yielded the lowest milk (1625?89 kg.) among all the 50% crossbreeds. For three crossbred types viz. Brownswiss, Ayreshire and Jersey, 3/4 grade of the crossbred were superior to 1/2 grade in terms of milk production. The age at first service was also found significantly affected by the genotypes. (p<0.05).). The overall calving interval of 75% Jersey was the lowest (443.1?50.89 days) and that of 75% Ayreshire was the highest (652?152 days). The birth weight of calves were not significantly different for the sex, but differed with the genotypes (p<0.001). The birth weight of 75% Brownswiss was the highest (26.11?0.89 kg) and that of 50% Ayreshire was the lowest (16.55?0.89 kg.).

This study was undertaken to determine the suitability of different genotypes of crossbred cattle in Khumaltar Research Farm. Lactational milk yield was significantly affected by the genotypes (p<0.001). The least square means of milk yield of 75% Brownswiss was the highest (2631.6?152 kg.) followed by 75% Ayreshire ( 2478?318 kg.) and 75% Jersey (1945.9?131 kg.). The 50% Ayreshire yielded 2163?95 kg. milk followed by 50% Holstein (1882?86 kg.) and 50% Jersey (1796?136 kg.). 50% Brownswiss yielded the lowest milk (1625?89 kg.) among all the 50% crossbreeds. For three crossbred types viz. Brownswiss, Ayreshire and Jersey, 3/4 grade of the crossbred were superior to 1/2 grade in terms of milk production. The age at first service was also found significantly affected by the genotypes. (p<0.05).). The overall calving interval of 75% Jersey was the lowest (443.1?50.89 days) and that of 75% Ayreshire was the highest (652?152 days). The birth weight of calves were not significantly different for the sex, but differed with the genotypes (p<0.001). The birth weight of 75% Brownswiss was the highest (26.11?0.89 kg) and that of 50% Ayreshire was the lowest (16.55?0.89 kg.).