Eco-efficiency of leys-The trigger for sustainable integrated crop-dairy farming systems

The specialisation of agricultural systems in Western Europe and the intensification of livestock and cropping production are intrinsically linked to substantial resource inputs. This intensified approach frequently leads to nutrient surpluses and biodiversity loss, resulting in detrimental environmental impacts. A transformative agricultural shift is imperative in light of climate and environmental protection objectives. Addressing this need, the Lindhof eco-efficient pasture-based milk production initiative, initiated in 2016, is a tangible manifestation of a productive and profitable dairy system integrated within a ley-based Integrated Crop-Livestock System (ICLS). Operational at the organically managed Lindhof farm, this approach involves a rotational stocking system of spring-calving Jersey cows stocked on grass-clover-herb leys embedded within a cash crop rotation. The dairy cows benefit from these highly productive swards, rich in nutritive value comparable to concentrate feeding. At the same time, the cultivated crops derive advantages from the legacy effect of leys due to nutrient exchange facilitated by grazing excreta and residual crop matter. Compared to specialised systems, the ley-based ICLS emerges as an alternative dairy production paradigm that supports many ecosystem services - including minimised nutrient losses, a lower carbon footprint and positive contributions to agro-biodiversity. These outcomes are realised without compromising overall land-use efficiency while reducing environmental and social costs of 20-30 Eurocent per kg of milk produced compared to specialised systems. Thus, the ley-based ICLS conforms to the principles of ecological intensification, enhancing functional diversity within the agricultural landscape. Essentially, the Lindhof initiative represents a holistic and environmentally responsible approach to farming that could contribute to realising the EU Farm to Fork Strategy.