Districts of the Haryana State viz. Hisar and Karnal form important tract for the famous Haryana breed of cattle and Murrah breed of buffaloes. These districts were dominated with higher concentration in livestock population and infrastructural developments were selected purposely for this study. The multistage stratified random sampling technique was used for selection of the respondents. The study concluded that the age at first calving found to have considerable economic significance to the farmers because the cost of rearing heifer from birth to calving and consequently the milk yield are strongly influenced by this character. The milk yield and labour cost revealed inverse relationship with herd sizes. The net maintenance cost per milch cross-bred cow per day was highest in winter season and lowest in rainy season on all the herd size groups. The total feed and fodder cost constituted the most important item of the total cost accounting for about 63 to 68 per cent of the total cost across herd size group in different seasons. On an average, net profit of milk production of a cross-bred cow per day was the highest on small herd size group (Rs. 19.49) followed by medium (C. 18.62) and large size group (C. 18.01) in Karnal district. The net profit per cross-bred cow per day was higher in rainy season on all the herd size groups and the lowest in summer in case of small and large herd size groups and in winter in medium herd size group.