Analysis on the technological and economic effcets for different crossbreeding combinations in pig

On the base of reproductive performance,fattening performance,feed wastage of breeding swine and market price,technological and economical effects were evaluated for 6 different crossbreeding combinations including Duroc×Sichuan White Dam I(D×I),Duroc×Yorkshire(D×Y),Duroc×Landrace×Yorkshire(D×LY),Duroc×Yorkshire×Landrace(D×YL),Duroc×Yorkshire×Sichuan White Dam I(D×YI) and Duroc×Yorkshire×Local Swine(D×YB).The economical effects of D×Y,D×YI,D×YI,D×YL and D×I are higher than that of others.The gross benefit per sow are $61 52,58 83,57 75,32 74,respectively.Sichuan White Dam I ranks the first in the reproductive performances among 6 combinations,of which the number of born,the number of alive per litter and the number of weaner at 70 age per year are 12 57,11 71 and 22 47 heads,respectively,and Y×I for the corresponding performances ranks the second,those of which are 11 91,11 15 and 21 35 heads,respectively.