一级毛片观看,国产毛片在线视频,艹逼欧美,一级美女毛片,黄色一级片av,av黄色免费看,a毛片在线

With the development of science and technology, pig breeding equipment has been constantly improved and improved, which occupies a certain position in the pig industry. Today, I will introduce the method of using equipment to breed the original pig.
1. Make daily production records, summarize regularly and master the background
There are many daily files in the original pig farm, including pedigree card, boar breeding schedule, semen collection registration form, breeding record form, sow breeding and birth registration card, piglet birth and weaning group transfer record form, immune injection record form, etc. In order to master the reproductive performance of male and female pigs, each production change must have a complete record, and a summary every week to find production problems, so as to adjust in time next week; a summary every month, report to the field level leaders to master the dynamic; a comprehensive summary must be made every half year and the end of the year to sort the production performance of male and female pigs, so as to make the next stage breeding and production plan.
2. Establishment of breeding core group and differentiation of breeding group
In a large-scale original pig farm, the annual renewal proportion of the general pig population is about 30%. Usually, in the original population of 2-5 foetuses, the ones with a large number of offspring in the same litter and no genetic disease, the body shape and appearance meet the requirements, and the growth speed is fast are reserved for supplement. However, in order to speed up the generation replacement and improve the level of breeding progress, it is generally planned to keep the first child for one generation a year. Therefore, it is necessary to establish breeding core group and distinguish breeding group.
3. Breeding method of core group
After the establishment of the core group, the breeding of the original pig farm is mainly carried out in the core group.
Generally speaking, as long as the pig farm can strictly follow the determination and selection procedures, adhere to the 4-5 generations, the quality of the pig population can be significantly improved. If we can participate in regional joint breeding, implement semen exchange, establish blood relationship and expand the scale of breeding core group, the index analysis will be more accurate and the breeding progress will be increased together. Therefore, it is the foundation to do well in the field of testing and breeding, and the direction is to carry out the field combination. All original seed farms should abandon the narrow concept of market competition, integrate into the large family of national combination breeding, and make due contributions to the breeding of lean meat pig strains with Chinese characteristics, and then they can continue to have a place in the national pig breeding market.