Dissolve yeast in warm water; add milk, shortening, sugar, salt, eggs and 3 cups of flour. Mix well until smooth, then add enough of the remaining flour to make a soft dough. Knead into a smooth ball and place in lightly oiled bowl, turning to coat. Cover with towel and let rise until double, about 1 hour. Shape into two loaves; place in greased 9×13 loaf pans. Let rise until doubled, then bake in 375 degree oven for 45 minutes. Turn out onto rack to cool.