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We switched all of ours over to lay pellets around 16-18 weeks. We figure that as soon as they lay, they'll need the lay pellets. Plus, not all will be laying at the same time, so there will still be some that are on the pellets and not laying...so what's the difference? Lay pellets are not a hormone feed to cause them to lay, but rather a feed that is nutritionally designed to provide the bird with the nutrients that they lose to the egg while laying. Roos can be on lay pellets as well (all of ours are) and they don't start becoming feminine from it. Think of it like a non-pregnant person taking all those prenatal vitamins. It doesn't make them get pregnant, right? Some docs recommend taking the prenatal vitamins before pregnancy so that they are in the system when pregnancy does occur. It's the same thing.
Hope this helps!
Also...regarding the laying. We have had some that starting laying at 16 weeks and a bunch that haven't laid yet at 21 weeks old. It depends on the breed. My Jersey Giants and Buckeyes probably won't lay until they are between to 24-30 weeks old.
My feed store person said not to switch hens to layer pellets until they started laying because the excess calcium in the layer pellets (that they need for the egg shells) could be harmful. I thought also that the excess calcium was bad for roos and that in a mixed flock you had to feed a normal pellet and then supplement with calcium (oyster shells). Not that I've ever done it that way because I don't have roosters, but that is what people with mixed flocks tell me.
Regarding the extra calcium in the pullets... I was told (where's a poultry vet when we need one!
) that the short amount of time between putting them on the pellets and them starting to lay won't do any damage. None of my hens have had problems and they were started a few weeks before laying.
Regarding the roosters...well, I again was told that it is fine; however, I will look into this more since I don't want to hurt my roos if it is, in fact, hard on them in the long term.