Extended lactations in dairy production: Economic, productivity and climatic impact at herd, farm and sector level

The management concept “extended lactation” whereby farmers deliberately delay time of first insemination allow them to utilise the high milk yield potential of modern dairy cows for longer. The main objective of this study was to quantify the effect of different extended lactation strategies on herd productivity, farm economics and sustainability at product level with focus on greenhouse gas emission. The herd model SimHerd simulated cow state,...