The aim of the present study was to investigate the impact of and variation in both maternal and production input traits on the production economy within extensive and intensive suckler cow production systems. By use of a bio-economic model, feed intake, number of weaned calves, kilogram carcass produced, gross margin and labour costs for an average cow (including offspring) through one production cycle from one calving to the next were simulated. Several scenarios were included, changing the input traits from the average within the third of herds with the lowest performance, to the average within the third of the herds with the highest performance in the Norwegian beef cattle recording system, and compared with baseline scenarios. The results revealed that the variation in production traits had the largest influence on the economic result, but the calf mortality and the calving interval also had considerable economic importance. Both the extensive and intensive production systems were profitable, with a similar gross margin/kilogram carcass.

本研究的目的是调查广泛和集约型奶牛生产系统中母体和生产投入性状对生产经济的影响和变化。通过使用生物经济模型，模拟了从一个产犊到下一个产犊的一个生产周期中一头普通母牛（包括后代）的采食量，断奶犊牛数量，公斤kilo体数量，毛利率和人工成本。其中包括几种方案，将输入特征从性能最低的三分之一的牛群中的平均值更改为挪威肉牛记录系统中性能最高的三分之一牛群的平均值，并与基准方案进行了比较。结果表明，生产性状的变化对经济结果的影响最大，但是犊牛的死亡率和产犊间隔也具有相当大的经济意义。粗放和集约化生产系统均具有良好的利润率，毛利率/千克car体相似。