山东泗水县泗张镇一位孙姓生猪养殖户告诉本报，目前生猪存栏有一定提高，但存栏的增加速度还是有限，
B-address I-address I-address I-address I-address I-address I-address I-address O O O O O B-position I-position I-position I-position O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O