Parameters based on the probability of gene origin were used to describe genetic variability in a buffalo population from the Embrapa Amaz nia Oriental, Bel??m, Par??, Brazil. The parameters generated medium to low values (around 20 animals) and suggested low founder representativeness. From the 20 ancestors that gave more genes to males (with 71% of alleles), genetic contributions were 39%, 26%, and 5%, respectively, for Murrah, Mediterraneo, and crossbreds. For females, these values were 42% and 26% for Murrah and Mediterraneo breeds.
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