[Experience with different systems of renumeration according to efficiency in dairy farms]

condiciones sociales condition sociale contrat de travail contratos laborales costo del trabajo empleo emploi employment exploitation agricole explotaciones agrarias facteur de production farms incentives incentivos incitation labour labour contracts labour relations new laender nouveaux laender nuevos laender production factors productividad productivity relaciones laborales relation professionnelle remuneration salarios social conditions trabajo travail