Shedding is affected by photoperiod, nutrition and genetics all of which affect the hormone balance that triggers shedding. Most in the rockies will start losing antlers in mid to late February, but others in the same area could drop in January, while others won't drop until mid March. They don't normally shed both sides at exactly the same time, which is why it is rare to find matching sets. But they will shed within about 2-3 days of each other.
Yes it means the length of daylight. Nature uses photoperiod to trigger many seasonal reactions, rather than just weather, as a cold or hot, or wet, or dry spell could be disastrous if that was a plant or animal's sole indication of when to rut, drop leaves, produce seeds, drop antlers, grow a new coat of hair, shed current hair, etc.
How many of you out there keep a journal of your hunting trips or outings? I started to about 20 years ago and then moved them from a journal to a story that I will send out to my friends so that they can enjoy the time as well. I'll aslo put into the journal the scouting trips that go along with the hunts of limited or once in a lifetime hunts.
I have found that if you buy a small notebook that fits into your shirt pocket and take it with you when you head out is the...