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Four small pigs
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**1. Small Batch Pig Raising with Annual Slaughter of 40 Pigs**
- **Crop Structure:** A total of 6,000 square meters (9 acres) of corn, 1,300 square meters (2 acres) of wheat, and 2,000 square meters (3 acres) of soybean green (double cropping) are planted.
- **Pig Production:** In January, February, April, and June, 5 piglets weighing over 7 kg each are purchased. Starting from the end of April, 5 pigs are slaughtered monthly, and 5 new ones are added after each slaughter.
- **Feeding Method:** The pigs are fed in stages over 120 days.
- **Production Efficiency:** There are 8 batches of 40 pigs per year, with an average weight of 85–90 kg. Each pig generates 2,500–3,200 yuan in income, with a profit of 250–500 yuan per head. Annual revenue ranges from 20,400 to 25,000 yuan, with a profit of 2,000–4,000 yuan.
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**2. Rotational Rearing Every Two Months, 60 Pigs Slaughtered Annually**
- **Crop Structure:** 8,670 square meters (13 acres) of corn, 2,000 square meters (3 acres) of wheat, and 3,330 square meters (5 acres) of soybean green (double cropping).
- **Pig Production:** Piglets weighing more than 7 kg are bought in January, February, April, June, July, and September. Each batch consists of 10 pigs raised together.
- **Feeding Method:** Piglets and finishing pigs are raised in stages, with a slaughtering period of 110–120 days.
- **Production Benefits:** 6 batches of 60 pigs per year, with an average live weight of 90 kg. Each batch brings in 5,300–6,500 yuan, with a profit of 500–1,000 yuan. Annual revenue ranges from 31,800 to 390,000 yuan, with a profit of 3,000–6,000 yuan.
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**3. Four Batches of Feeding, Annual Slaughter of 80 Pigs**
- **Crop Structure:** 1.2 hectares (18 acres) of corn, 2,660 square meters (4 acres) of wheat, and 4,000 square meters (6 acres) of soybean green (double cropping).
- **Pig Production:** Piglets weighing over 7 kg are purchased in January, March, June, and September. Each batch includes 20 pigs raised together.
- **Feeding Method:** The feeding is divided into three stages: small, medium, and large. Pigs are slaughtered at 110 days old.
- **Production Benefits:** 4 batches of 80 pigs annually, with an average weight of 90 kg. Each batch generates 10,600–13,000 yuan, with a profit of 1,000–2,000 yuan. Annual revenue ranges from 42,400 to 52,000 yuan, with a profit of 4,000–8,000 yuan.
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**4. Self-Breeding System, Annual Slaughter of 100 Pigs**
- **Crop Structure:** 1.6 hectares (25 acres) of corn, 4,670 square meters (7 acres) of wheat, and 5,330 square meters (8 acres) of soybean green (double cropping).
- **Pig Production:** Good breeding sows are purchased in January. They are bred in early June, give birth in October, and enter the breeding cycle in November. The herd size is maintained at around 50 pigs every 5 months.
- **Feeding Method:** Pregnant sows, nursing sows, and piglets are fed in stages. From weaning to slaughter, it takes about 150–160 days.
- **Production Benefits:** A total of 540 pigs are slaughtered annually, with 110 pigs per sow per year. Slaughters occur every 5 months, generating 26,500–29,000 yuan per batch, with a profit of 2,500–5,000 yuan. With 2.5 batches per year, the annual revenue is 66,000–72,000 yuan, and the profit ranges from 5,500 to 11,000 yuan.
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This system allows for efficient use of land, consistent production, and sustainable income generation through careful planning and management.
This black and white ultrasound instrument has the appearance of a laptop shop brain, featuring portability and ease of operation. It adopts a lightweight design with light weight and small size, making it easy to carry and move around. It is also equipped with a user-friendly operation interface and intelligent function settings, enabling doctors to perform ultrasound examinations quickly and accurately.