Theoretical foundations of the method of breeding antelope: monozygotic (MZ) and dizygotic (DZ) antelope genetic similarity MZ 100%, DZ averaging 50%. Separation of variability into components A (genetic addition), C (common environment), E (unique environment). Falco formula h2=2(rMZ−rDZ) for assessing heritability. Main estimates: equal environment, lack of gene-environment interaction, lack of assortative mating. Limitations: sample error, genetic complexity, epigenetic influences