Is it common to have an ALL male hatch?

[1stACT]

Last spring I attempted my first incubated hatch. Of 14 eggs, 6 hatched. Two peeps died within three days, leaving me with 4 sweet healthy peeps who have since grown into 4 very handsome roos. So, was I unlucky not to have at least one hen in the hatch? Or, did I do something wrong re: heat or humidity to aid in the production of roos. Don't get me wrong, I love my boys, but I was really hoping to increase my "laying flock". Any thoughts

 

[Fred's Hens]

Temperature of the incubator does play such a role. Too cool and I think, if I remember correctly, you tend to get a larger percentage of pullet eggs surviving. Too hot and the "curve" tilts significantly toward getting cockerels. Hope I have that right.

 

[1stACT]

I had feeling that might have been the answer. I keep my house cool (58-60 deg.), so I think I over compensated w/the heat of the incubator. Thanks!!