[Genetic improvement of milk composition in ewes. The example of Lacaune sheep breed [Roquefort area, France]]

brebis breeding aims breeding methods calidad proteica contenido proteico ewes fromage grasa de la leche lait leche lipid content mejoramiento nutricional midi pyrenees midi-pyrenees milk milk fat milk production nutrient improvement objetivo de mejoramiento oveja protein content protein quality selection teneur en lipides