Results of s e lection experiments have usually been analysed using regression of response on selection differentials, Falconer 1989. Analyses of variance have also been used to partition variation into w ithin and between litter variation. Analysis of variance assumes independence of observations (or at least error terms) and most analyses are carried out using statistical packages, such as SAS (PROC GLM) and Harvey's programme, which assume, in addition, that all effects are fixed, whereas animals and litters should be considered as random effects as well as incorporating relationships between animals. Recently the animal model has been suggested to be the pre f e r r e d method of analysis (Meyer,1989; Sorenson and Kennedy, 1984).

R. I Cue, J. F Hayes

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 253–256, 1990
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