[Effect of an avoparcin compound on milk production on one herd under experimental conditions]

additif alimentaire aditivos alimentarios aliment pour animaux alimentation des animaux animal feeding animal growth promoters antibiotics antibiotique application rates breeds dairy cows dose d'application ensayo espagne evaluation feeds food additives milk production milk yield piensos promoteur de croissance animale promotores del crecimiento animal race razas rendement laitier rendimiento lechero spain testage testing vacas lecheras