Sylvester, do your Silkies have large crests?
I use rabbit drinkers on all of my brooders and grow out pens. The chicks pick up on how to use them VERY quickly. I love how clean the water stayed, and how much dryer everything was. So, I decided to switch my big birds over to nipples. After almost a week, some of them had really gone down hill and had to be nursed back to health (we gave cukes and melons to supplement as well). After they were doing well, I trimmed crests and gave it another go. Nope, I had to nurse them back again. I REALLY wanted it to work for the clean factor, but theyre not having it. Some of these birds even used the rabbit drinkers as chicks, so I figured they'd take to the nipples no problem