The primary purpose of pig farming is the production of meat, including pork and bacon. If the bacon industry is to thrive, factories must receive pigs of the right type. In order to improve the level of pig production, the use of fine types and feed, the implementation of strict epidemic prevention system and using high quality facilities for the effective control of the environment are necessary. The questions of how to improve the technological content of feed pig at each steps and conversion of fodder mainly consist in raising high quality pigs.
In pig production 2 phases of production are recognized: (1) sow farms (breeding and rearing); and (2) fattening farms (growing and finishing).The steps in these two farms include mating, pregnancy, childbirth, lactating piglets, and fattening. Excellent breed accomplished through thorough breeding system which base on breeding, rearing and fattening farms. The ideal result of using this system is promotion productivity by transferring the genetic improvement results of the core group to commodity production with uniform breeding program. (Fishwick, 1965)
Pig production patterns are diverse, space can be divided three categories in accordance with the activities of lactating sows which are intensive pig farming, semi- intensive pig farming and free range pig farming. In intensive and semi- intensive pig farming system, grower pigs are reared indoors in group-housing or straw-lined sheds, whilst pregnant sows are housed in sow stalls (gestation crates) or pens and give birth in farrowing crates.(Goodwin,1973) Intensive farming and semi-intensive farming have features includes taking less areas and high utilization of field.
Free range housing sows’ activity area is more than 5 m2 which have benefit of less investment on the factories and facilities, increasing sow activities to help improve the performance of sows fertility and piglets can do activities with sows so that increase resistance.