Observations about the ratio supplementation with rumen protected PP vitamin on production and reproductive efficiency in dairy cattle

allevamento degli animali animal health animal husbandry attitudine alla riproduzione bovin laitier calidad chemical composition composition chimique composizione chimica contenuto lipidico dairy cattle enriquecimiento de los alimentos food enrichment ganado de leche lactation lait lattazione latte leche lipid content milk milk yield nicotinamida nicotinamide performance de reproduction quality raciones ration rations razioni rendement laitier rendimiento lechero reproductive performance reproductividad salute degli animali sanidad animal teneur en lipides