We have had our 8 ducks (4 cayuga, 4 pekin) for nearly a year now and everyone is happy and healthy. One trick we learned this winter is to grow fresh sprouts, in 1L glass jars, so our ducks can enjoy something freshly grown with their food all year long. Some experimentation and we very quackly realized the ducks had a clear favorite - the Fenugreek sprouts we grew from spice-seed bought in the 'Bulk' section of our local store.They love them, and they're highly nutritious, offering 30% protein, as well as vitamins A, B, C, E, trace calcium, iron, magnesium, phosphorus, potassium, zinc, carotene, phyto-nutrients, etc. Fenugreek is an aromatic spice (and a digestive aid), often used in Indian cuisine, so it smells delicious when you cook with it, it is one of the key ingredients in curry. As it turns out, the sotolon (which is responsible for the aroma of fenugreek) is just as present in sprouted fenugreek, even 'post-digestion'. This has led to the strange but very pleasant experience of us actually LOOKING FORWARD to cleaning out the coop every day, since it smells so delicious. The sotolon in the sprouts COMPLETELY overrides any smells of poop, so the whole place smells like an Indian food restaurant. Very highly recommended.