If you wish to mate two birds of a species, you must find what is considered to be a true-pair.  Choosing the right male for pairing is a crucial task, as consequence of a bad choice can be infertile eggs that never hatch.

Determining the sex of the Shafttail Finches can prove to be difficult to an uneducated eye. A male is recognized with complete certainty only by his song. The male  will puff out his chest feathers while singing. Contrary to belief, the bill color has no relation to the sex of the bird. Bib size can be a helpful tool in determining the bird’s sex, as it is usually wider in males in compare to females, but it is difficult to base the sex solely upon this factor.

Availability of place appropriate for making nest, and increasing length of light phase from 12 to 14 hours with 10 hours of following darkness will naturally induce reproductive behavior of finches.

For breeding finches, a wooden half-open nest box or domed wicker nest should be provided. Usually we place some clean grass and hay inside the cage to be used by the finches in creating their nest. 

Some special products like   Breeding Aid can also be helpful for improvement of bird fertility, increasing egg number and quality.

The female will lay 4-6 white eggs; these will be cared for by the parents until hatching, usually within 14 to 18 days.

The protein diet and special supplements will not only help produce healthy chicks, it will also help them to develop, and molt into their adult color. Molting Aid is a good supplement for new feathers. It includes nutrient needed for feather formation and rapid growth.