Well then, that sounds ideal for breeding sex-linked ducklings. It sounds like they are chocolate mallard or something similar. I thought that it was just another name for the Golden 300, which is a breed with several names.
It shows all three languages simultaneously. For example, since I know only English, I select using the box next to "Choose Color". If I knew Dutch I would select using the box next to "Kies kleur". Just play around with it, and you will soon see that you don't need to know other languages at...
Golden Cascade is a rare breed, but from what I see online, your drake should be heterozygous for the chocolate allele, meaning that you can't use him to make sex-linked ducklings. You can't have two sex-linked generations in a row.
Let me make it clearer with breeds that I am more familiar...
You need to mate a chocolatey drake with a non-chocolatey duck. The male ducklings will be non-chocolatey, whereas the female ducklings will, so as you see, the color switches in the F1 generation.
If you bought your golden cascades from a hatchery, then they will be sex-linked, which means...