Reproduction is a complex which involves the performance of both male and female parents as well as the performance of the individual products of fertilization. Genetic variation in the process of reproduction may be attributable to variation from all three components. The likely importance of contributions from the various sources will depend on the stage at which the process is exaimined. Thus ovulation rate, for example, can receive no contribution from the zygotic source but may possibly be influenced by the male component while litter size at birth may be influenced by all three pathways.

J. P Hanrahan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 294–309, 1982
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