He who expects to incubate with old hens during the winter will surely get left.
"Natural and Artificial Duck Culture"
James Rankin
Later in the season, when many of the ducks are off duty from a desire to incubate, the proportion should be about one drake to ten ducks.
"Natural and Artificial Duck Culture"
James Rankin
Hens show no desire to incubate when you want them to the most, or in time to command the high prices for ducks and chicks in the early spring, and this is attended with a loss of at least one-half of the season's profits.
"Natural and Artificial Duck Culture"
James Rankin