Serious side effects can occur. 1  If you have any of these side effects, call your doctor right away or call 9-1-1: 2  Unusual bruising or bleeding. 3  Loss of appetite. 4  Abdominal pain. 5  Yellowing of the eyes or skin (jaundice) 6  Dark-colored urine. 7  Fever with sweating, confusion, racing heart, and muscle stiffness. 8  Extreme weakness.
Generally domestic ducks start to lay around 21 to 26 weeks of age. Although ducks will lay anywhere they can be trained to lay in low nest boxes especially if you place some pot eggs in the box. Plenty of straw which is changed frequently will help to keep the eggs clean once they start to lay. As they approach 20 weeks I would put some pot eggs in a low nest box or place a big pile of straw in the corner of the hut with some pot eggs in. My ducks started laying at 20 weeks old. I have found that my khaki campbell ducks generally lay their eggs early morning which means that it is not difficult to collect the eggs as they usually lay them in the hut before they are let out to free range for the day. I hope this helps.
Similarly as with different sorts of poultry, some duck breeds are raised for meat, some for eggs and some to create an equalization of both. Great egg-laying duck breeds can out-lay chickens. The laying season for ducks is as a rule around 35 to 45 weeks in length every year. How often do ducks lay eggs. The runner duck, the Cayuga, the blue Swedish and the buff duck are among the top layer ducks, averaging up to 180 eggs for each year. Poor egg layers, for example, the mallard may lay as few as 60 eggs a year. Some particular assortments, for example, the white layer duck can create almost 300 eggs a year.