I've got a group of Angus heifers that I'm going to breed June and July at 15 - 16 months old. I do however have 3 that are going to be about 20- 21 months old that I held back so they would all be spring calvers and fit what I want my operation to be. Other than losing out on the revenue of those 3 calving at closer to 24 months are there any issues with waiting that long into their heat and maturation process to allow them to breed? I want to have a uniform calf crop for variety of reasons but don't want to sacrifice the future of these 3 above average heifers, in my opinion. I feel like it shouldn't be an issue but I'm so accustomed growing up to breeding heifers at 14 - 16 months and 800 - 850 pounds to calve at or before 24 months. I appreciate y'all's feedback.