Milkability indices and their correlationships in the Black Pied Lowland breed and its crossbreds with the Slovak Spotted breed [Czechoslovakia]

animal animal domestique animal pour cuirs et peaux animales animales de carne animals artiodactyla artiodactyle bovidae bovide bovin bovin laitier bovine bovines cattle crossbreds dairy cattle dairy industry domestic animals economic sectors fisiologia fonction physiologique formas de descendencia forme de descendance ganado ganado bovino ganado de leche industria industria alimentaria industria lechera industrie industrie alimentaire industry lactation livestock mammals meat animals milking physiological functions physiologie physiology productos del cruzamiento produit de croisement progeny forms pure lines rumiante ruminant ruminants secondary sector secteur secondaire sector secundario vertebrados vertebrates vertebre