When to start providing Oyster Shell for Ducks

[Ronnie_]

Hi everyone!
I wanted to get some opinions on when to start putting out Oyster shell for my girls. My ladies (2 khaki kampbells, 1 Cayuga) will be 13 weeks this Wednesday. When is a good time to put some oyster shell out in their enclosure?
They already have free access to grit, and we are transitioning them now to a new feed mix that has 3% calcium to get them ready for their first egg (expecting that to be 16 weeks).
I wanted to pit out oyster shell too in case they need a bit more or so then they will be getting. Any tips on when to make that available to them?

(Added Photo for Duck Tax)

 

[Ilovemychicks08]

Im curious too. As mine are 12 weeks. But they wont lay until they are 5 to 8 months.

 

[Miss Lydia]

Around 4 months put it out in a separate bowl they will eat it as they need it. Many domestics start mating anywhere from 4-5 months old and usually lay anywhere from 2-4 weeks after mating starts.unless you have Muscovy which can mean 8-9 months before mating and laying.

 

[Ronnie_]

Around 4 months put it out in a separate bowl they will eat it as they need it. Many domestics start mating anywhere from 4-5 months old and usually lay anywhere from 2-4 weeks after mating starts.unless you have Muscovy which can mean 8-9 months before mating and laying.

Okay! I don’t have any drakes right now. Do certain breeds start laying earlier than others? I have only the Cayuga and Khaki Kampbells right now. I’ll wait till 16 weeks to put it out

 

[Miss Lydia]

Well, I started out with Muscovy and they didn't start breeding and laying till 8-9 months old then I wanted Runners and Buffs, and boy did they surprise me they were mating at 4 months and laying at 4.5 months. I think most domestic other than Muscovy do lay around 4-5 months old.