Different selection strategies were examined where subjective visual classing data was combined with objective criteria into single or two-stage selection indices. In the two-stage procedures, subjective criteria and/or greasy fleece . were used at the first stage. The conclusions were, firstly, that the a .ltl?n subjective criteria to a single-stage selection system which contains objectively measured variates can improve overall economic response; secondly, gains will only be marginally decreased if subjective criteria are used to reduce the numbers of rams to be tested to 70% in a two-stage selection programme.

R. P Lewer, I. M MacLeod

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 61–64, 1990
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