Dairy cattle production systems in France: break-down of revenues and variable costs in the models and gross margin analyses in the literature. Dairy cattle production systems in France: break-down of revenues and variable costs in the models and gross margin analyses in the literature. LC, lowland with corn silage; LCG, lowland with corn silage and grass; UCG, upland with corn silage and grass; UGFC, upland with grass Franche-Comté; UGMC, upland with grass Massif Central Barbara Häsler et al. Vet Rec Open 2015;2:e000035 ©2015 by British Veterinary Association