The effect of dietary molybdenum and sulphate on the oestrus cycle and ovulation in ewes after manipulation with exogenous progesterone alone or in combination with FSH and LH

azufre brebis ciclo estral cobre copper cuivre cycle oestral deficiencia de oligoelementos diet dieta ewes lh molibdeno molybdenum oestrous cycle oveja ovulation ph progesterona progesterone soufre sulphur suplementos supplements trace element deficiencies