...The duck raiser who isbreeding his ducks for exhibition quality has needfor knowledge of the breeding of the birds he maycontemplate using in his matings... 
Harry M. Lamon 「Ducks and Geese」
...Theyoung ducks when hatched are yellow or creamyblue and from blue matings there are also producedblack and white ducklings...
Harry M. Lamon 「Ducks and Geese」
...Size of Matings...
Harry M. Lamon 「Ducks and Geese」
...As a rule, matings once madeare permanent from year to year unless changed bythe breeder on account of poor results...
Harry M. Lamon 「Ducks and Geese」
...In wild land birdsthe pairing habit is not of advantage to a species, but still thetendency to single matings is very strong...
John H. Robinson 「Our Domestic Birds」
...In making matings, the ownerwould know at once that these two were not to be allowed to matetogether, as they would be brother and sister...
Carl Dare 「Profitable Squab Breeding」
...If the eggs are infertile, the troubleis likely with the cock and the matings should be broken and two birdstried again...
Carl Dare 「Profitable Squab Breeding」
...Interspecific matings under laboratory conditionsare not uncommon and several verbal reports of such matings under naturalconditions have reached me...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...) observed 72 matings of T...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...) and highhumidity; some matings took place in a pool of water...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
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