Economic selection index: A combination of factors and genetic information, either phenotypic data or genetic predictions, on more than one trait. Often used in multiple-trait selection to predict aggregate breeding value.
Effective population size: The size of a population as indicated by its rate of inbreeding.
Egg cell: Also referred to as a gamete.
Embryo transfer: A biotechnology technique in which embryos from donor females are collected and transferred into recipient females.
Environmental effect: The effect that non-genetic or external factors have on animal performance.
Environmental trend: Change in the average performance of a population over time, caused by environmental effects.
Estimated breeding value: A prediction of breeding value. Also see breeding value.
Extension locus: Area on the chromosome where color occurs or is modified.
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