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In this study, ewes of "Merinolandschaf", a breed widespread in southern Germany, werecrossed with rams of five meat breed types (Ile de France, Charollais,German black-headed mutton sheep (Deutsches Schwarzköpfiges Fleischschaf), Suffolk, Texel) and Merinolandschaf rams. Theresulting lambs (179 individuals) were fattened intensively from55.3 days and body weight of 20.4 kg until 121.7 days and a weight of40.9 kg. While fattening, feed intake was recorded and lambs were weighed weekly.Ile de France × Merinolandschaf and Texel × Merinolandschaf seem to be of greatest economic interest for intensive fattening becausethey showed the best feed conversion rate and energetic feed conversionrate. Only these crosses were significantly superior compared to purebredMerinolandschaf in feed conversion rate and also in daily body weight gain duringthe fattening period. Except Charollais × Merinolandschaf, all crossesshowed at least a tendency of improvement in all three traits compared toMerinolandschaf, although this is not always significant. This underlines theadvantage of one-way cross-breeding for efficiently producing lamb meat. Thegrowth was modelled with a linear model and the Gompertz model. The results showedthat both models fit the data well, although the average<i>R</i><sup>2</sup> was slightly higher and the average mean square error wasslightly lower for the Gompertz model. In addition, the use of the Gompertzmodel provided some interesting biological insights concerning the growth oflambs and differences between the crosses, even though the lambs wereslaughtered before reaching their mature body weight

Analysis of growth and feed conversion in purebred and crossbred German Merinolandschaf lambs