That may be area specific. Rarely do I have a mature buck use a spin feeder - day or night. I have eight bucks in one place on another type of feed, poured on the ground. Four of them are mature. They are 300 yards from a spin feeder that runs 365 days a year. Not one of those bucks has ever been to that spin feeder, or any other spin feeder I have. The day I poured out the first bag of protein in June, two of the four mature bucks showed up along with several others. Within 48 hours, there were 8 bucks feeding at the protein on the ground - none of which had ever been to the spin feeder 300 yards away - or 3/4 mile away, or a mile away. I have had, but rarely, a mature buck or two get on a spin feeder in the past 20 years. Was much more common 10 or 15 years ago.
We started feeding protein about seven years ago. In the first 15 years we owned our land we killed a 154, and two right around 148. The biggest deer in 15 yrs weighed 182. In the past five years, we have killed a 141, 149, and a 158. The next door neighbor has killed a 152 and and 153 - for which he thanks me. I feed them all summer long. We have weighed a 195, 200, 205, and 225. I know of most good deer my neighbors kill - but for sure not all.
These deer eat a lot of protein. I do believe it is just more than coincidental that a few years after we started feeding protein, the bucks were weighing 20 lbs more. Folks I know three miles away did not see an increase in weight of their deer over the same time frame. It is not unrealistic to believe if the deer body weight is increasing - so might its antlers. We arent talking increases like Baker sees - we are talking maybe a few inches. Also during that time fawn recruitment has been slightly higher - but I have noticed where there are a lot of bucks, does feed very little at the protein - they stick with the corn. It is also obvious that if a buck is visiting a feed site three times a night, he is spending less time roaming on your neighbors - a big part of why we feed, also.
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This deer above is at least 6.5 yrs old. He roams all over the place. All the neighbors have pictures of him. He lives in my protein until about mid Oct - then goes on walkabout all over the place. Yes, my kids and my grandkids would shoot him with his head in the feed - as would everyone of my neigjbors. We have been trying to kill him for two years - this will be yr 3. In this area, having multiple feed sites is no guarantee of killing anything but a doe.