Effects of the season on milk yield and on some milk characteristics in cows [Emilia Romagna]

air temperature animal husbandry methods chemical composition composition chimique composizione chimica contenido proteico contenuto lipidico contenuto proteico control de calidad control lechero controllo del latte cow milk dairy cows emilia romagna fotoperiodismo gestione del bestiame lait de vache latte di vacca leche de vaca lipid content livestock management manejo del ganado metodi di allevamento degli animali milk recording milk yield photoperiodicity protein content rendement laitier rendimiento lechero saison seasonal variation seasons stagioni temperatura del aire temperatura dell'aria teneur en lipides vacas lecheras vacche lattifere variazione stagionale