Yes, it does, from my own experiences. Someone said it was an 'old wives' tale', totally dismissing that those 'old wives' tales' are usually based in reality. Until you experience yourself, don't dismiss someone else's experiences.
Check your temps... too high a temp and you'll get more cockerels than pullets. It may only be a decimal point or two, but it's enough. Try to keep it at the 99.5 but no lower than 99.2 for more pullets.