The main tool for the improvement of farm animals is genetic selection. The efficiency of selection depends on t he accuracy of genetic evaluation. New molecular technologies are now available that can make possible an accurate identification of genotypes and widesp r e a d screening of animals in the population for m a r k e r traits related to quantitative characters. Among the n ew technologies the p olymerase chain reaction (PCR) procedure of gene amplification represents a significant advance in the field of mol e c u l a r biology for the analysis of DNA and RNA (White et a l . . 1989). This technique will play a prominent role in future application of molecular methods to animal breeding.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 71–74, 1990
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