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Title of the paper: <b>Alternative selection strategies for the Mutton Merino breed to optimize breedineSystems</b> This paper deals with the investigation of alternative selection strategies for the Mutton Merino breed to improvelamb meat production and fertility. A main topic is the application of ultrasonic scanning to evaluate the meatcontent on live animals. The aim of model calculations was the optimisation and comparison of five differentselection strategies within three different schemes of gene dissimation. First a basic scheme was defined andoptimised (selection on field records, one-step selection, no scanning). It was regarded as the reference schemeto which all other breeding Systems were related. The following schemes considered both, selection with andwithout scanning. A second scheme, also based on field records, includes two-step selection of rams (calledimproved field test scheme). In a third and fourth scheme a level of uniform environment was assumed for ramprogeny testing. These are a central testing Station on the one hand with slaughtering and carcass evaluation onprogeny, and one or more contract farms on the other (without slaughtering). For a fifth selection scheme anopen nucleus was assumed with ram progeny testing in associated test herds.  In a dcterministic approach using the ZPLAN Computer program, the monetary genetic gain for the breedingobjeetive (traits lambs weaned, litter weight at weaning, postweaning daily gain and lean meat content) and theprofit were calculated for each scheme after optimisation of various biological-technical coefficients. Thehighest profit was achieved with a nucleus scheme (DM 9,16). Due to low recording costs the basic scheme wassecond (DM 7,19) and, because of high costs, the Station scheme was last (DM 4,22). The other two schemeswere intermediate (DM 6,98 for the scheme with contract farms and DM 6,58 for the improved field testscheme). On an average over all schemes, scanning resulted in a 0,24 DM (i.e. almost 30 per cent) increase ofthe monetary genetic gain and a threefold higher genetic gain for lean meat percentage. In all schemes scanninglead also to a higher profit because the higher retum of selection based on scanning exceeded the higher costs

Planungsrechnungen zur Optimierung von Zuchtplänen der Rasse Merinofleischschaf