Beef Cattle Improvement Association, the average cow age in the state is 5.7 years, which means the average number of calf crops per cow is 4.7, since she doesn't calf that first year. Current cull prices would pay $70 per cwt., which would come to $910 for a 1300 pound cow.ardage for 4.7 years @ $90/year = $423.00. Total expenses = $2622.60. Net income over life of cow = $2582.03. If a producer would like to realize a profit of $200 per head each year that would be an additional cost of $940 over the life of the cow, meaning that the value to pay for a bred heifer would be $1642.03.