A team of research organizations and breed associations in Aragon, Spain, has identified the Grivette gene variant in three native sheep breeds, Ojinegra, Cartera, and Maellana, which is associated with increased prolificacy. The research is part of the TerGenOvi project, aimed at improving the productive efficiency of native sheep breeds of Teruel. The gene variant can be used to select reproductive animals carrying the gene or eliminate it, and has the potential to increase the efficiency of productions and provide a work alternative in difficult rural areas. The project also highlights the importance of the sheep sector in terms of social and environmental benefits.