[Studies of organic farm systems: Organic production of milk: Techno-economical farm results 1996-97]

agriculture biologique aptitud lechera consumo de energia cost analysis crop yield cycle de l'azote dairy cows danemark denmark dinamarca economic analysis energy consumption farm management feed intake gestion de l'exploitation agricole manejo de fincas milk performance milk production nitrogen cycle organic agriculture precios prices prise alimentaire (animaux) prix production data production economics rendement des cultures rendimiento de cultivos vacas lecheras