SIAMPIGS NETWORK.: IMPROVING ASIAN PIGS GENETIC LINES.

SiamPigs' goal is not only to improve production performance, but also to solve endemic and chronic herd health problems. In Asia, some pig producers buy breeding stock from Europe and the US with the expectation that the imported genetics will result in a giant leap forward for their breeding programmes. In doing so, they often make false assumptions when comparing their current performance and projected farm performance. They expect to see a lift in performance, but performance figures are not straightforward phenomena. SiamPigs, established in Thailand, is a network of pig producers using improved genetics, disease tolerant and disease resistant pigs as a tool. This network works on 3 principles; 1) Disease resistance and tolerance; Under real commercial operating conditions, when animals are intensively reared and disease is a limiting factor, natural selection is allowed to do its work. Unlike animals from European or the US genetic farms that have never faced disease challenges, animals selected by SiamPigs are disease tolerant or have resistant traits, and come from its own network across Thailand. Animals that have successfully adapted and continue to be productive are recruited as seed stock for further development and use within the network. Pigs in the SiamPigs network are resistant to Porcine Reproductive and Respiratory Syndrome (PRRS), Actinobacillus pleuropneumoniae (App) and E. coli. The network can select disease tolerant or resistant animals that even experienced diseases but can nevertheless provide a good productivity to be used in breeding schemes . The experience in Thailand is that progeny from imported breeding stock appeared more susceptible to disease than progeny of SiamPigs. As a result, the network’s pigs need fewer drugs or antibiotics, leading to less residue in pork, hence an enhanced food safety. 2)One nucleus one farm (ON-OFF) model:The conventional model also called one nucleus-multiple farms(ON-MF), uses disease resistant pigs in combination with a closed herd system, reducing the risk of problems. The ON-OF model is a closed herd designed to replace great grandparent (GGP) breeding stock by all SiamPigs breeds. The one nucleus, multiple farms model (ON-MF), where breeding stock is imported for replacement, , despite many strategic management advantages, like within-herd gilt multiplication, good bio security measures and proper vaccination, disease outbreaks are still likely. Often it is believed that quarantine reduces the risk of disease introduction with newly imported breeding stock. Nevertheless, quarantine could also be seen as a strategic mistake which can result in increasing the potential of pathogens to reach recombination or heterosis beyond the levels that vaccination could cover. Especially when a nucleus herd continuously distributes parent stock gilts to multiplication herds and then executes quarantine measures before transferring breeding stock or parent stock gilts into the farm, such quarantine allows endemic pathogens to enhance their heterosis and thus the epidemic diseases to occur. Based on production efficiency, the ON-OF model yields an optimum performance with consistent results. It is apparent that differences in production efficiency are generally the result of disease. The more animals that are brought into the farm, the greater the contagious risk becomes, especially if the animals are brought in from various sources. The ON-OF model minimizes the frequency and number of animals brought into the farm,thus Selection is based on environment, nutrition, housing and management. This results in uniformity, the overall performance of farms within the SiamPigs network is consistent and competitive. 3)High lean sire and dam lines (GGR model) :To create a lean meat focus in both the sire as well as the dam breeding line. Breeding objectives in Europe and the US are often to focus on their market needs, i.e. to the culture of red meat and fat consumption. For example, the industrial sausage manufacturing requires lots of fat mixture rather than lean meat only. This usually happens in combination with selective breeding, focusing on achieving a high number of piglets per sow per year (PSY). The negative genetic correlation between PSY and lean meat percentage makes the end product (the pigs) suboptimal for the needs of countries importing breeding stock, e.g. those of Thailand. Often, illegally salbutamol is used in several Asian countries in an attempt to 'correct' this, as meat with a higher lean meat percentage is what is desired. The selection of terminal sires is usually not enough to effectively drive the parent stock to produce finishing pigs containing as much red meat, meeting market satisfaction. Therefore, in order to solve this problem the selective breeding of the dam line is to be targeted at 'high lean sow', which SiamPigs also has defined as selective breeding goal from the beginning. The pig production system yielding a higher red meat percentage, corresponding to Thai market needs is called the 'GGR model', in which 'G' refers to growth and and 'R' to reproduction. Pig breeds have not always been developed to be resistant to endemic pathogens – in the case of SiamPigs, those in Asia. For that reason, this network chose to focus on the selection of disease tolerant or resistant pigs and create its own network of disease prevention. The ON-OF model not only prevents infection introduced with imported breeding stock and replacement gilts but also makes disease pressure in the herd minimal. This ensures that, not only nucleus farms will have a high health, but all farms will. In addition, since the production that meets the market needs in each country on each continent are different, the swine selection goal of each country is to be determined differently and appropriately to each region's market needs as well. story culled from( pig progress.)