Black-white dairy cattle
breeding region of dairy cattle
China Holstein dairy cattle
Chinese Holstein Dairy cattle
chlamydiosis in dairy cattle
concentrate supplement dairy cattle feed
dairy cattle
乳用牛
泌乳奶牛
荷斯坦奶牛
黑白花奶牛
中国荷斯坦奶牛
乳牛
奶牛
双胎
猪
卵巢疾病
酮病
牛
酵母菌
dairy cattle farming community
dairy cattle in farming area