1. Weaning (21 days old) selection: The first selection (primary) can be performed when the piglet is weaned. The standard for picking is: the piglet must be from a sow with a high litter size, conform to the appearance standard of the breed, have good growth and development, have a large body weight, have bright fur, long back, strong limbs, and 7 nipples. For the above (more than 6 pairs of lean type pigs), there were no obvious genetic defects.
The selection of reserve gilts from the Tai Wo is mainly based on the mother's litter size and should be kept as much as possible when weaning. In general, the number of primaries is more than 10 times the final scheduled number of boars reserved, sows are more than 5 times, so that the latter can have a higher chance of election, so that the intensity of the choice to increase, is conducive to obtain a better choice progress.
2. Staying at the end of childcare (70 days):
Nursery pigs are subjected to tests such as weaning, environmental change, and reloading. The nursery will end up with 70-day-old piglets. After weaning primary piglets are nursed, some of them are not strong enough for use, and their growth is hindered, and some are inherited. Defective performance gradually, therefore, the second choice at the end of the childcare plan will be robust, heavy body weight, without licking the nipple, boar testis good primary piglets into the next phase determination.
3, the end of the measurement phase selection:
The performance measurement is usually completed at the age of 5-6 months. At this time, the individual's important production traits (except for reproductive performance) have basically shown. Therefore, this phase is the key period for selection and should be the main election phase. Should do:
1 Those who have physical weakness, obvious limb disorders, inverted nipples, severe signs of loss of body shape, a particularly small genital area, and genetic defects in their litters may be eliminated first. We will conduct a survey of the nipple defects and leg and foot fidelity of male and female pigs.
2 The remaining individuals should be selected for retention or eliminated according to the comprehensive breeding value index composed of the growth rate and the production traits of living backfat. Individual selection must be conducted strictly according to the level of the comprehensive breeding value index. The number of stays at this stage may be 15% to 20% more than the final number of seeds.
4. Sows breeding and breeding stage selection: At this time, reserve breeding pigs have passed three choices, and their ancestry, growth and development and appearance have been more fully assessed. Therefore, the main basis for this period is the reproductive performance of the individual. Sows may be considered to be eliminated in the following cases: There are no estrus signs after 1 to 7 months of age; 2 In the course of one estrus, 3 consecutive inexperienced persons; 3 After 3 months of weaning, no signs of estrus; 4 Maternal too Poor; 5 who have too few litters. 5 Boars have low libido, poor semen quality, and fewer litters in sows
Network Camera NVR CCTV Kits
The functional mode of NVR technology application is relatively flexible and can meet the functional requirements of today's video monitoring system to a large extent. The small NVR scheme with NVR technology as the core has the advantages of small scale, flexible operation, convenient use, economy and practicality. Its front end mainly supports 8-way 720P high-definition video image access with high-definition video camera, and then realizes the centralized management and real-time storage of high-definition video image information through NVR technology. In addition, this small NVR scheme can also support remote management of video images, preview analysis of video images, real-time upload of gigabit network interface video image data, local preview, video playback and other functions. The small NVR high-definition video scheme has a high overall cost performance ratio, simple system and high operational flexibility. This small NVR high-definition video monitoring system is widely used in the centralized video monitoring field in small areas such as companies, factories, family villas, offices, shops, supermarkets, etc.
With the further increase of functional requirements for high-definition video monitoring system, the video monitoring system is required to have the technical performance of expansion, cascade and standard ONVIF communication protocol. The HD cameras of different manufacturers and brands at the front end of the video monitoring system can be organically interconnected through NVR equipment. In this way, a unified functional integrated LAN can be built through NVR to achieve NVR cascade, expansion and mass storage in the video monitoring system. In addition, a centralized advanced application management technology platform is built at the back end through NVR expansion, which can uniformly manage and configure the NVR device group to achieve multi-user forwarding and various application function services (forwarding/management server group) within the region, mainly including: forwarding server, management server, storage database, on-demand server, advanced client application software and other functional modules. The medium-sized NVR high-definition video system is usually used in the medium-sized high-definition video surveillance projects with routes below 1000. Its advantages are that NVR can achieve distributed layout and centralized and unified storage, and its operation stability is high. The back-end technology platform carries out unified management and application, and can achieve multi-user and multi-level integrated and unified application services. The secondary medium-sized network mainly focuses on the urban video monitoring architecture of district, county or prefecture level cities. It realizes the storage of video image data and the centralized communication management of access to front-end equipment through NVR, thus realizing the storage, management, client video image preview, local decoding on the wall and other service application functions of front-end high-definition camera video. At the same time, it can also be authorized by the provincial video monitoring center, The video image information can be previewed, controlled and shared among clients of different levels of users, fully meeting the normal video monitoring function requirements of secondary users in cities such as prefectures, counties and cities.On the basis of the secondary network structure, a large NVR high-definition video system is built by converging into the primary network through private networks, optical networks, and public service networks. The storage and forwarding services of the primary network are realized through the industrial control NVR, and the redundant and safe backup of the video monitoring system is realized at the same time. This distributed multi-level coordinated back-end centralized management network mode greatly provides the overall function and fault tolerance of the video monitoring system, highlights the ease of operation and reliability of the high-definition video monitoring system based on NVR technology, and meets the flexibility, multi-function performance, sharing Emergency handling and other functional requirements.
NVR technology has been widely promoted and applied in urban safe storage, national security and other engineering projects with its own advantages in many aspects. Driven by market and technology, NVR technology will become the mainstream technology in the field of urban security high-definition video surveillance, with very strong theoretical research and practical application prospects
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