One: During the calf period, each cow needs to store 5-8 Jin of corn stalks and a small amount of distiller's grains or other weeds every day. Need 3-5 kilograms of concentrated feed. Hereford cattle include corn flour 60%, wheat bran 30% (bean cake or cottonseed cake, rapeseed cake) 10%. 30 cows need a catty of salt every day, and the cowshed is disinfected every two weeks for regular prevention. After the cattle enter the pen, they begin to deworm at intervals of one week, the first time and the second time are four days apart, and the two times can be cleaned with deworming nets. Fattening period: each cow needs 8- 12 kg of grass, 5-8 kg of concentrate, grass 12- 15 kg of topdressing in the later period, 8- 10 kg of concentrate and 30% of grass.

Two: An improved beef calf with a weight of about 300 kg needs to invest about 3,000 yuan, and the average monthly grass consumption is about 300 kg, which is equivalent to cash 30 yuan. Concentrate is about 240 kg per month, and cash is about 150 yuan. For example, the prevention of various diseases, salt for cattle, 30 yuan every month. Raising 200 cows requires two breeders and two forage preparation and management. The per capita salary is calculated according to the monthly 600 yuan, and the total salary of breeding for half a year is 14400 yuan. The salary per cow is not as high as that in 80 yuan. If the average monthly growth rate is 1.20 kg, it can be increased by 720 kg in half a year, and the original purchase of 300 kg can reach more than 1 0,000 kg. We can calculate the feeding cost of each cow as follows: (1) Each cow needs to invest about 3000 yuan; (2) The transportation and quarantine expenses are estimated to be about 1 10,000 yuan; (3) Feeding management salary is about 1 1,000 yuan; (4) The concentration of grass is * * 1, 654, 38 yuan.

Three: after feeding for six months, plus the weight when buying cattle, according to 1.200 kg, each cow can sell for about 8400 yuan. Excluding the above total cost of 5000-5700 yuan per cow, the net profit of a cow is 3400-2700 yuan, which is not less than 2700 yuan in the case of poor management.