Thank you! 2 weeks it is then! I was trying to decide if I should use the horizontal or the vertical! I just place an order for the horizontal and they should be here on Wednesday!I have horizontal nipples in the brooder from the get go......but also an open waterer there all the time until about 2 weeks when I start removing it for much of the day.
By then a few have figured out the nipples and others follow suit.