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.
奶牛采食行為學的研究,選用健康無病的貴州喀斯特地區(qū)中國荷斯坦奶牛16頭,每個泌乳階段4頭。