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
黑白花奶牛
酵母菌
荷斯坦奶牛
牛
酮病
泌乳奶牛
中国荷斯坦奶牛
卵巢疾病
猪
奶牛
乳牛
双胎
乳用牛
dairy cattle farming community
dairy cattle in farming area