Summary
To verify the effects of lot management and all-in/all-out system in swine production, the authors performed 6 times feeding experiments using 1,385 head of pigs at the large-scaled farm in which 800 head of sows were continuously raised.HomePage
By carrying out the lot management and all-in/all-out system, mortality due to chronic disease decreased to half of it in comparison with an ordinal continuous raising system, and also decreased to one fifth, if provided with sufficient ventilation air. Within the range of 16 to 25 days, dispersion of weaning age due to grouping the pig lot did not significantly affect to the feeding performances, and acclimatized feeding at furrowing pen was not necessary. However, pigs showed symptoms of some disease after 2 weeks from weaning, and then mortality became worst after 3 to 4 weeks. Therefore, it was considered that modification for raising management and pig environment was very importnt at the farm infested to chronic disease.Keywords: swine production system, large-scaled husbandry, lot management, all-in/all-out system, raising performance