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Application of economic values and the cumulative discounted expressions of traits for a pig breeding program

Application of economic values and the cumulative discounted expressions of traits for a pig breeding program

Animal Science and Technology 66(4): 353-360

Economic values (EV) were derived from a bio-economic model of a pig farm. Cumulative discounted expressions (CDE) for production (prod.) and reproduction (reprod.) traits in the Japanese breeding structure were calculated using the gene flow method. The revenues used in the model were obtained from multiple regression based on the carcass records of 1,258 pigs slaughtered in Kumamoto prefecture in 1991. Average carcass unit prices obtained according to at Osaka Market in 1993 were used for evaluation of individual pigs. EV (Yen cntdot year-1 cntdot head-1) of traits were: 16 (g-1) for growth rate, -331 (mm-1) for back fat thickness, 764 (head-1) for litter size, -88 (%-1) for mortality at weaning, -179 (%-1) for mortality at stage III. Assuming evaluation periods of 40 half years (i.e., 20 years) and a discounted rate of 6.5%, CDE (head cntdot half year cntdot head-1) were calculated as follows: 0.516 for prod. with the path from the dam of line A to her progeny, 0.979 for reprod., 0.499 for prod. with the path from the sire of line B, 0.849 for reprod. and 1.109 for prod., with the path from the sire of line C, and 0.019 for reprod. The present approach which uses multiple regression and production model appears useful for estimating EV for traits with a non-linear profit function. The use of EV corrected with CDE allows us to determine pig breeding goals from an economic aspect as well as to design breeding schemes which take uncertain future breeding circumstances into account.

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