I've raised many hatches using the horizontal nipples and no other water source from day one. Nudging the pin becomes a source of entertainment in addition to getting a drink. They love it. When I first started using these I was worried that my babies wouldn't get enough water. I forced myself to just let them do it. Yes, they will rush to any new drinker if I put one in there.....but if I don't put another drinker in there they do just fine. I stopped worrying about it after a few hatches. I'll never go back to vertical nipple waters or traditional founts that cause problems with wet bedding. I do use my baby cup bottle with tiny bantams (or the occasional weak chick) and newly hatched quail but I take it out after 10 days and put them right onto the horizontal nipple bottle.
An example with adult birds: The other day I gifted my neighbor with a gallon drinker with the horizontal nipples. Her chickens had never seen one of these before. They took to it instantly. I told her to take their other water out and just let them do their thing. Both the chickens and my neighbor are very happy. Chickens are SMART! They are more intelligent than they are often given credit for.
An example with adult birds: The other day I gifted my neighbor with a gallon drinker with the horizontal nipples. Her chickens had never seen one of these before. They took to it instantly. I told her to take their other water out and just let them do their thing. Both the chickens and my neighbor are very happy. Chickens are SMART! They are more intelligent than they are often given credit for.