4 · Society, Civilization, Culture
47 · crafts and industries
47I · agriculture, cattle-breeding, horticulture, flowerculture, etc.
47I2 · cattle-breeding, livestock industry
47I21 · cattle
47I212 · pig
47I2122 · sow
47I2122(+9) · sow (+ zoological aspects of domestic cattle and poultry)
47I2122(+94) · sow (+ animal behaviour)
47I2122(+945) · sow (+ animals eating and drinking)
47I2122(+9451) ·
sow (+ animal in search of food)