hello SN,
daffs are poisonous to all animals, thats all parts of the plant although the bulb is the most poisonous. They can cause abortion if taken even in relatively small amounts , and death if the bulb is eaten or, enough of the other parts of the plant . Will sheep eat them ? ..I don't know ...I have never seen them do so , but others who keep sheep will soon tell you . Hope that helps a bit ....
cheers
Russ