. Fig. 56. — Triple-yolketl cj; (.Uriginal.) that a bird which possesses the tendency to lay double- yolked eggs is not equally likely to produce them at any age. She is most likely to produce them when she is young. Eighty per cent of all the double-yolked eggs produced by the Station flock are produced by birds less than eight months old. We have only a very few records of birds which have laid double-yolked eggs after their first adult molt. It has been usually supposed that double-yolked eggs are caused by the simultaneous entrance of two yolks into the egg tube and the consequent common p
. Fig. 56. — Triple-yolketl cj; (.Uriginal.) that a bird which possesses the tendency to lay double- yolked eggs is not equally likely to produce them at any age. She is most likely to produce them when she is young. Eighty per cent of all the double-yolked eggs produced by the Station flock are produced by birds less than eight months old. We have only a very few records of birds which have laid double-yolked eggs after their first adult molt. It has been usually supposed that double-yolked eggs are caused by the simultaneous entrance of two yolks into the egg tube and the consequent common passage of the two
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
