foraging ethology

Research on dairy foraging ethology:16 healthy Chinese Holstain Dairy Cattle in Guizhou karst area were selected to observe the ethology,in which each lactation stage had 4 dairy cows.
奶牛采食行为学的研究,选用健康无病的贵州喀斯特地区中国荷斯坦奶牛16头,每个泌乳阶段4头。