Pigs of different origins and weights are bred in groups and often bite and attack each other, affecting the body's health and weight gain. Therefore, according to the physiological characteristics of pigs, rational grouping, maintaining a suitable breeding density, adopting an effective swarm approach, and making full use of the equipment in the enclosure, arranging a good environment for the growth and development of pigs is conducive to raising pig-raising efficiency. 1, the principle of grouping. Pigs with similar sources, body weight, body condition, temperament, and feed intake were bred in groups and managed in separate groups to ensure the normal growth and development of pigs. The difference in weight between the same group of pigs should not be too great, and the difference in weight of piglets was not significant. More than 3-5 kilograms, the shelf weight of pigs does not differ by more than 5-10 kilograms. It should be relatively stable after group separation. Generally, it should not be arbitrarily changed. 2, suitable density. Generally, each continuous piglet accounted for 0.7 square meters in the fence area, and the finishing pigs each had 1.2 square meters. Each group is suitable for 10-15 heads. In winter, the stocking density can be appropriately increased and the stocking density can be appropriately reduced in summer. 3, and group approach. The key to merging groups is to avoid biting each other at the beginning of the gregarious period. According to the biological characteristics of pigs, methods can be used: (1) Weakness does not stay strong: the weaker pigs remain in the original circle, and the stronger pigs are called out. (2) Do not dismantle and remove less: keep the pigs less and stay in the original circle, and merge the number of heads into the pigs with few heads. (3) The night is not married: The pigs in the ring group are sprayed with the same medicine, such as alcohol, so that the odors are not easily distinguishable and are grouped at night. (4) Coherent New Column: The number of pigs in the two groups is equal, and their strengths and weaknesses are equal, and the group has the same tune to the new pigsty. (5) After the first-maturity, the two groups of pigs should be kept together in the larger playground and then grouped again for 3-7 days. (6) Scavenging and hunger: The pigs are split in groups when they are hungry, and they are fed immediately after the group is hungry. 4, strengthen management. Before the swarm, the sheds were cleaned and strictly sterilized. During the first few days after the gregarious period, feeding management and training should be strengthened. If bites or fighting are found, they must be immediately stopped and the bitten pigs must be protected until the pigs are safe.
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