This study was carried out to construct selection indices on the basis of profit expected in an integrated production system. The integrated production system was assumed to consist of nucleus, grand-parent (multiplication), parent (reproduction) and commercial (production - growing and finishing) herds. The effect of a unit change in a character on the profit in this system was taken as an estimate of economic value for that character. In on-farm performance tests, three characters, total number born, average daily gain and backfat thickness, are usually recorded. Selection indices for these three characters were calculated as follows using genetic parameters and economic values estimated in this study. Duroc [I=3.0x1+102.9x2-39.2x3], Landrace [I=2.9x1+132.0x2-55.8x3], Yorkshire [I=2.4x1+165.4x2-57.2x3] where x1 is total number born (piglets/litter), x2 average daily gain (kg) and x3 backfat thickness (cm). It is logically sound to calculate economic values for characters of importance in an integrated production system as a whole rather than at some partial stages of the system. Also, as the economic values thus calculated were dependent upon the current level of performance, it is bound to be more accurate if they are calculated for a specific herd with known performance. The swine industry of a country as a whole may be regarded as an 'integrated production system' in a broad sense, and hence, national selection indices can be derived by the methods employed in this study.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.38, 2006
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