Comprehensive Strategy For Controling Disease In Scale Pig Farms And It's Application

Compareing with the developed coastal provinces and cities in southern china, there aremany differences on the concept of pig raising, management of pig farm and disease controlin northern china. Because of the cold weather in winter, simple and crude building andequipment, there are high incidence of sow infertility, diarrhea of post-wean piglets,respiratory disease of pigs of any age and low incidence of surviving piglets. In 2004 theaverage mortality of these diseases in scale pig farms was 24%～35%, which cause greateconomic losses. Application of antipyretic, analgesic and antimicrobial drugs to controlthe pig diseases is not very effect. In this study a feasible comprehensive strategy forcontrolling these disease in the scale pig farms.Twenty pig herds were selected and divided into 2 group as testing and control groups,10 pig farms for each group. In the test group, the strategy was used for one year. Theincidence of disease and mortality, economic effect in the 2 groups were observed for 2years and statistical analysised. The results showed that estrus rate of sows in 7 dayspost-wean in the group of ten testing farms was 88.4% in 2005 and 77.6% in 2004 whenthe strategy was not used, The average sow estrous rate in farms of testing group (3.53%)decreased by 1.91% compared with that of control group (5.51%) and decreased by 1.68%compared with that of same farms (5.21%) before testing in 2004.The averagenumber of piglets born alive was 21.73 for per sow in one year in the testing group, with anincrease by 1.16 live piglets, compared with that of the control group (20.57 live piglets),and by 1.06 live piglets compare with that of same farms (20.70 live piglets) before testingin 2004.The mortality of suckling piglets is 6.36% in farms of the testing group, anddecreased by 3.65% compared with that of the control group(10.01%); Comparedwith same farms(9.75%) before testing in 2004, the mortality of the sucklingpiglet was decreased by 3.39%. The average mortality and elemination rate ofweaner in farms(11.47%) of the testing group is lower than that of the controlgroup(13.67%) by 2.2% and that of same farms(13.71%) before testing in 2004by 2.24%. Averagely, for sale were provided by one sow could provide 17.8 pigs in the test group, with more 1.7 pigs than that of the control group(16.1) andmore 1.3 than that of the same farm(16.5) before testing in 2004. The feed gainratio of pigs in farms of the test group is 2.77:1 which is lower than that of the controlgroup (2.99:1) and that of the same farm (2.98:1) before testing in 2004.Drugcost for each pig in farms of the test group is 27.5 RMB which is higher than thatof the control group (27.4) and that of the same farm (27.1) before testing in2004.This study showed that the comprehensive strategy, including scientific andelaborate raising management, strict biological safety measure, rational use of vaccine,procedural use of antibiotics or chemical drugs with feed or water, adopting "4+1" expellantmodel, and improving residential environment, could significantly enhance thereproductive performance of sows, decrease the incidence of disease and mortality rate aswell as increase feed reward and raise economic efficiency in the scale pig farms.