Ok I also ask this question about hatching duck eggs ...... I try with 8 apple yard hatching eggs before and place them in a turner along with my chicken eggs , seem no luck with the 8 apple yard some where infertile and others just didnt fully developed .........but most of all the chicks hatched
So I again try with 17 Mallard and 8 buff s and also try with 7 woods and a few 6 mandarin hatching eggs , Well I hand turn them 3-5 times a day , within 24 hr s and 15 of the Mallard 7 of the buff all hatched but the woods and mandarin did not , all where set at the same time / day and all had the same humid , I even let the woods and mandarin set longer in the bator but none hatch , I end up seeing that most where all not fertile at the end ,
but I must say If I hatch ducks eggs again I would hand turn then again better hatching rates