Closed adult MOET nucleus schemes with discrete generations of single trait selection were investigated using Monte Carlo simulation. Simulated rates of response and inbreeding ranged from 0.17-0.35 phenotypic standard deviations and 3.2-9.3% per generation respectively. Simple predictors, assuming base generation variances and large population sizes, overestimated responses by 40-67%. More realistic predictors, accounting for the effects of finite numbers, inbreeding and selection, were within 4% of the simulated responses. The benefits of alternative breeding strategies were described. Factorial mating designs increased response while the use of more than one male from a selected sibship reduced inbreeding. The combination of these two strategies increased response and reduced inbreeding.