To ensure a high-quality lean-type pig and increase the lean meat percentage, several key factors must be carefully managed. Currently, the lean meat content in local Chinese pig breeds is only around 41%. Through extensive research, Nanjing Agricultural University developed a three-way crossbreed combining Duroc, Landrace, and Erhualian pigs. These pigs, when reaching 90 kg, have a lean meat yield of up to 49 kg, with a lean meat ratio of 54%, showing significant improvement.
Feeding lean-type pigs requires a balanced diet tailored to their growth stages. For pigs weighing between 20 and 50 kg, the feed should provide about 3,100 kcal of digestible energy per kilogram. The crude protein level should be around 16% during this phase. When pigs reach 60 to 90 kg, the protein requirement decreases to 14%, but essential amino acids like lysine, methionine, and cystine, along with vitamins, should be included in appropriate proportions to support muscle development.
To simplify feeding, commercial concentrates from feed mills can be used. These can be mixed with corn, bran, rice bran, soybean meal, and other ingredients according to the manufacturer’s instructions to create a complete, balanced feed. This eliminates the need for purchasing individual supplements. If commercial feed is unavailable, the following homemade formulas can be used:
1. For pigs weighing 10–20 kg: 60.2% corn, 4% bran, 28% soybean meal, 4% fishmeal, 2% yeast powder, 0.3% salt, 0.5% bone meal, 0.5% compound trace elements, 0.5% multivitamins.
2. For pigs weighing 21–35 kg: 63% corn, 10.2% bran, 13.5% soybean meal, 6% rapeseed meal, 5% fishmeal, 0.3% salt, 1% bone meal, 0.5% compound trace elements, 0.5% multivitamins.
3. For pigs weighing 36–60 kg: 62% corn, 12% bran, 5% wheat gluten, 10% soybean meal, 5% rapeseed meal, 3.5% fishmeal, 0.5% salt, 1% bone meal, 0.5% compound trace elements, 0.5% multivitamins.
4. For pigs weighing 61–90 kg: 57% corn, 18% bran, 6% wheat bran, 9% soybean meal, 5% rapeseed meal, 3.3% yeast powder, 0.5% salt, 1% bone meal, 0.1% compound trace elements.
Breeding techniques also play a vital role. The “open front and rear control†feeding method is widely used. Before pigs reach 50 kg, they are fed freely or multiple times a day without restriction. Once they exceed 50 kg, feeding is limited to two meals a day, with only 80% of the full amount provided. This helps reduce fat accumulation, as fat deposition increases significantly after this stage. Overfeeding at this point may lead to excessive fat gain and lower lean meat production.
Research has shown that pigs between 40–60 kg gain about 288g of lean meat daily and 280g of fat. However, once they exceed 90 kg, lean meat gain drops to just 120g, while fat gain doubles. Therefore, it is recommended to slaughter lean-type pigs between 90–100 kg to maximize lean meat yield and quality.
Vacuum packed Shelled shrimps,Vacuum packed shrimps,Fast Food Dried Shrimps
Zhejiang Ocean Family Co., Ltd., , https://www.ocean-family.com