Welfare of Dry Sows

摘要: At any one time, a female breeding herd comprises both dry sows and farrowing/ lactating sows. The term ‘dry sow’ encompasses all gestating sows, awaiting service barren within the herd. There is great diversity of sow housing systems currently in use. Over last few decades, has generally seen move from somewhat extensive towards intensive systems, although this trend reversing Western Europe reversal also beginning to show emergence pig industries other developed countries, such as U.S.A., Canada Australia. Until recent reverse, major factor behind design was that economics production. Since World War II, there have been steady reductions number individual producers, but increases size herds. away form with small numbers larger units initially fuelled by price incentives late 1940s, when production cheap, plentiful food meet post-war demand often supported governments. intensification accelerated 1950s new system-based technology applied. cyclical, profit-loss nature industry decline producer. It made economic sense increase size, stocking densities decrease labor costs mechanising where possible. ultimate developments, terms gestation housing, were those stalls tethers. Keeping permanent confinement gave farmer advantages over less systems. For example: