Prerequisites of the development of cattle rearing based on a rational use of the local resources of feeds in the regions of Bohemia [Czechoslovakia]

aliment pour animaux alimentos para animales animal animal domestique animal pour cuirs et peaux animales animales de carne animals artiodactyla artiodactyle besoin nutritionnel bovidae bovide bovin bovine bovines cattle cereales forrajeros comercio comercio exterior commerce commerce international crops cultivation cultivo cultivos domestic animals economic plants europa europe feed cereals feed crops feed legumes feeds forecasting ganado ganado bovino hortalizas (plantas) importaciones importation imports industrial crops international trade legumes leguminosas leguminosas forrajeras livestock mammals mathematics meat animals methode methods modele modelos models necesidades de nutrientes nutrition nutritional requirements papa planification planning plantas plantas azucareras plantas feculentas plantas forrajeras plantas industriales plante plante de culture plante industrielle plante racine plants pomme de terre potatoes pratique culturale regional planning remolacha azucarera root crops root vegetables rumiante ruminant ruminants starch crops sugar beet sugar crops trade vegetable crops vertebrados vertebrates vertebre yield forecasting