TABLE 4.

Simulation results for the Mediterranean dairy sheep breeding scenarios considering either resilience (slopes of daily protein yield on temperature; scenarios Base and 1–3) or stability (absolute values of the slopes; scenarios 4–7) in the breeding goals.

Results are presented for the initial (0) and final (20) generations. Traits simulated were daily milk yield (DMY, kg/day), daily fat yield (DFY, g/day), daily protein yield (DPY, g/day), fertility (Fert, %), and resilience or stability (Res/Stab, g/°C/day). The phenotypic index not accounting for resilience/stability in the breeding goal (Index0) is presented. Economic profits (€/L) are presented under the current climatic scenario (Profit0) and for an increase of +1°C (Profit1) and +2°C (Profit2) of the average temperature. Economic losses for milk yield under the +1°C (Losses1) and +2°C (Losses2) temperature changes are calculated in comparison with the respective base scenario. Most favorable scenario is shaded in gray.

*Index0 was computed as a phenotypic index that combined all traits except resilience (Res), using the same weights as those in the base strategy.

¹Profit0 was computed as an economic index that combined all traits (phenotypic values) weighted by economic weights described in Legarra et al. (2007a,b). Profit1 and Profit2 are similar to Profit0 but considering losses in production due to heat stress in a scenario of increased average yearly temperature of 1 and 2°C, respectively.

²Losses1 and Losses2 represent percentual losses in future climatic scenarios regarding the respective base scenario.