Abstract
Genetic trends were estimated by mixed model procedure. Records were on 588 and 548 selected ewes, respectively, representing 7 years of birth groups from 1980 to 1986. Traits were evaluated independently. The analyses were within ewe ages (2, 3 and 4 years). Regressions of overall average breeding values on year of births increased (0.0014) for prolificacy ( P<0.05) and rate of increase was higher for prolificacy than litter size, possibly because of direct selection pressure on prolificacy. The study indicated the effectiveness of selection for prolificacy in the Romney Marsh sheep. It is also indicative that simple procedure for solving mixed model equations can well be used for the estimation of genetic trends of reproductive traits in sheep.
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