JadeComputerGal is right, it takes years and many birds to make a new breed, but that is how many were started, for chickens, rhode island reds, chanteclers, many others were developed from many other breeds and generations selected for the birds they were looking for in their breed, lotsa culling involved also. The hybrid chickens I mentioned that are excellent egg layers are also like a hybrid plant seed, it only works for that first offspring, any further breeding does not give the same result, only the first cross. I am more interested in preserving our heritage breeds we already have before they die out because the meat and egg industry is only interested in profits, they don't want these old heritage breeds. This is also why this interest in "back yard chickens" in suburban areas is such a great thing. Many of these new found poultry enthusiasts have helped keep many of the critically endangered breeds from extinction. Check out
www.livestockconservancy.org . There are many heritage breeds of ducks that could use your help. The khaki campbell is on their watch list and lays more eggs than any chicken. The cayuga is on threatened list, and is native to the USA. The Livestock Conservancy also has a comparison chart that shows how many eggs they lay, if they are good for meat production, rapid growth or slow, and if they are broody,good mothers. Some of the listed critically endangered ducks are excellent egg layers, good meat producers and have rapid growth. I see the khaki campbell is listed poor for broodiness, but my accidental campbell, mallard cross had many successful hatches. Maybe it was a good cross, or maybe that one duck was a fluke? If you do decide to go on with your experiment I bid you good luck! I personally someday want to try a chicken cross that will probably cost me a lot of money because neither breed is efficient growers, they take a lot of feed and time. But I'm curious as to how big and tall a Malay, Jersey Giant cross will get. The Jersey Giant can weigh 13lbs, and have been reported to reach 18lbs. The Malay can reach 9-10lbs, and they can be 3 foot tall!! I've read posts on people who want to try it, but haven't found any info on the results of a potentially ginormous chicken.