Relationships between the manganese content of the ration and the rise of the effects of zinc deficiency in dairy cows

attitudine alla riproduzione carenze di oligoelementi ciclo estral ciclo estrale cinc cisti ovariche cycle oestral dairy cows deficiencia de oligoelementos endometrite endometritis feet integratori kyste ovarien lesiones lesioni lesions mammite manganese manganeso mastite mastitis milk yield oestrous cycle ovarian cysts performance de reproduction pied piedi pies placental retention raciones ration rations razioni rendement laitier rendimiento lechero reproductive performance reproductividad ritenzione della placenta suplementos supplements trace element deficiencies vacas lecheras vacche lattifere zinc zinco