Effect of feeding nitrogen, calcium and potassium treated mulberry leaves on the larval development and silk yield of Bombyx mori (L.)

alimentation des animaux animal feeding azote bombyx mori calcio calcium crecimiento croissance feuille gain de poids ganancia de peso growth gusano de seda hojas larvae larvas larve leaves mora mulberries mure nitrogen potasio potassium rendement rendimiento seda silk silkworms soie suplementos supplements weight gain yields