What breeds lay during winter with NO additional light source?

[junebuggena]

Once they are all over a year old, they will molt at roughly the same time each year. The annual molt has less to do with the time of year a bird was born, and more to do with the shortening days of fall.

 

[SBE]

First year pullets don't always lay all winter. Lots of factors can come into play, for example: hours of daylight when pullet reaches sexual maturity. Lattitude of the flock.

Could you give some references for this information? Especially on "hours of daylight when pullet reaches sexual maturity"? Details please.

 

[lazy gardener]

Here's a starter article for you. You can do your own google search for science based articles that deal with this subject. Almost every agricultural extension office, College with an ag program, as well as producers have studies that deal with this subject matter.

https://watermark.silverchair.com/j...XU2K7v1GjZhhY3zcmdq-s93oETffq4C7AubSOUgNBmwsc