Marsdens produce two feeds for growing ducklings which are both formulated with the mallard in mind. 

• The Starter Crumb - 20% protein 
  Comes in a standard sized crumb form. It should be fed for the first 3 weeks. 
• The Duck Grower – 18% protein
  At the beginning of week 4 the ducks can change from Crumb to Duck Grower. The 18% protein diet will produce a strong mallard at 6 weeks, ready for the switch to grain.