Twelve experiments that relate to heterosis retention or recombination effects were reviewed. In some experiments less heterosis was retained than expected from retained heterozygosity. In a few cases, more heterosis was retained than expected. Interpretation of some experiments was difficult because of the designs and the possible interactions of environment with genotype and heterosis since many experiments involved imported breeds. However, it appears that heterosis in advanced generations of crossbred populations cannot be accurately predicted from initial heterosis and retained heterozygosity. This does not mean that all heterosis is lost, but rather that the level of heterosis must be determined by direct experimentation involving specific breed combinations.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 497–508, 1986
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