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Khakis are famous for their egg laying abilities, not for their brooding. You can use the 6-1 ratio , however I found that I get a better hatch if I drop down to 3-1. Most farmsteads raise the 2-1 ratio as they get to incubate some eggs for replacement ducklings but continue to get eggs for the household table. They find it to be very satisfactory amount. For my Pekins, which I raise for meat, I use the 6-1 ratio as each hen would lay 8 to 15 eggs before they go broody and quit laying at that point. After they hatch the ducklings, I take them away and they in short order lay the next batch which they raise. I sneak in a few Khaki eggs under the broodies to get more egg layers, but not too many as the males usually get processed and they don't produce nearly as much meat as the Pekins. I would recomend you subdivide your area to keep each male with his females seperate from the next pairings. You will be much more happier. (my next door neighbors baught a dozen ducklings [Malard/Pekin], he dug a nice pond [12 x 20 x 2 ] with a pen [30 x 50 ] around it. Grew up to be 4 drakes and 8 hens. At maturity, the drakes started to chase and breed the ducks usually all at the same time. One day they actually drowned one hen on the pond [ she saw it happen] when all of them tried to breed her at once. I became the beneficiary of 3 of those drakes that day... tasted mighty fine). With 18 mouths to feed I would recommend that you subdivide your 36 x 36 area into 2 or 3 pens. One or 2 small pens with a drake and 3-6 hens [each], then a large pen with only females. You should probably lobby for more space to keep it from becoming too messy/ smelly. The number of hens should depend on the number of eggs that you would need, ie one or two eggs per member [ daily or every other day] plus some for baking.