I was in the same situation this year, my BR's abandoned their nest, so i put the eggs in the incubator asap. Well They didnt get back around to nesting for quite a while, by the tome they started the clutch, the pigeons were ready to hatch. So I promptly put them under the BR pair and they gladly accepted all four, both new babies hatched but one passed away (Im assuming because they couldnt handle all the commotion) But they chick that lived is almost 2 weeks old and doing great! They other eggs should be hatching soon, so we will see how well they do with 3 squabs, one being alot larger. On that note, i could really use a Pros advice, should I take the big squab out before the others hatch so I dont endanger the babies? Would it be easier hand feeding at this age? If so what formula should I buy