16. Do not change the feed suddenly.
17. Feed liberally, and use only fresh, palatable feed-stuffs; in no
case should decomposed or mouldy material be used.
18. Provide water in abundance, easy of access, and always pure;
fresh, but not too cold.
Encyclopaedia Britannica, 11th Edition, "Dagupan" to "David" Volume 7, Slice 9 · 第 14 / 52 题