Question:   query regarding    duck farming 
Answer:  shed for the duck preferably should be constructed in the midst of the pond maintaining the water -- to save the animal from rodent & wild animal & also to reduce the  infection . vitamine ( mainly b- complex ,inject ad3e prior to laying ( sos) . antibiotic  & vaccine should be given from time to time, to mitigate the bacterial & viral infection . calcium & magnesium can be given after proper investigation by veterinarian .