Using B-ultrasound for timely detection of sow pregnancy not only allows for observation of pregnancy status, but also saves a lot of costs. Below, I will calculate the cost of raising 30 sows as follows:

Using B-ultrasound to observe the empty pregnancy period of sows: One year is about 2 months. Calculated based on 60 days, the average feed price is 1.4 yuan/jin, and the daily consumption is about 2.75 jin. The feed cost is about 230 yuan. 

Using B-ultrasound to observe the middle and late stages of pregnancy in sows: about 4 months a year, calculated based on 120 days, the average feed price is 1.6 yuan/jin, with a daily consumption of about 4.75 jin, and the feed cost is about 900 yuan.

Observing the lactation period of sows with B-ultrasound: less than 2 months per year, calculated based on 50 days, the average feed price is 1.7 yuan/jin, with a daily consumption of about 6.5 jin, and the feed cost is about 550 yuan. 

Pigs observe the remaining 10 days of the sow using ultrasound as the mobile period: either in empty pregnancy, pregnancy, or lactation. The average feed price is 1.56 yuan/jin, with a daily consumption of about 3 jin and a feed cost of about 45 yuan. 

In addition to feed costs, sow breeding also includes breeding expenses, labor costs, epidemic prevention expenses, depreciation expenses of pig pens and delivery rooms, and other expenses. The cost of breeding each sow is about 40 yuan, and breeding twice a year costs 80 yuan. The labor cost for raising each sow is about 350 yuan/head, the epidemic prevention cost is about 50 yuan/head, the depreciation of the pigsty and delivery room is about 100 yuan/head, and other expenses including water, electricity, gas, etc. are about 50 yuan/head.

Summary: The feed cost for one sow for one year is 230 yuan+900 yuan+550 yuan+45 yuan, and other costs are 80 yuan+350 yuan+50 yuan+100 yuan, totaling 2305 yuan. 30 sows is 69150 yuan.

From the above summary, it can be found that the cost of feed used by sows during pregnancy is relatively high. If a sow is mated for two months without pregnancy and the technicians do not conduct timely testing, it will be fed according to the pregnant sow, resulting in wastage of feed costs.

The main function of a pig B-ultrasound machine is to timely detect whether the sow has successfully mated and whether there are live or dead fetuses. Technicians will make timely evaluations based on the situation. The price of ready-made B-ultrasound Machines for pigs is also relatively low, so it is necessary to equip a sow with a B-ultrasound machine.

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