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The development of pig production started in the 1960s when the first group of exotic pigbreedswas imported by the Department of Livestock Development from the United Kingdom.These were Large White, Tamworth and Berkshire breeds. Later, Landrace and Duroc pigs wereimported from the United States [2]. Before these exotic breeds were introduced, farmers relied onthe relatively slow growing native pigs that had the desirable quality of not needing much in theway of trade inputs [1]. Since 1981 pig breeding has steadily been industrialised in Thailand. Thus,indigenous native pigs have been increasingly mated with imported breeds to improve theirperformance in economically important traits. Native pigs have gradually become crossbreeds and arefinally replaced by European commercial breeds as the meat delivering end product in the porkindustry [7].
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