Past two years we have left bull in instead of pulling. Normally we put bull in in June for late March and mostly April calves . Then Back in in November for 90 days . We were having more fall calves than spring calves so we decided to do this . We have moved our august and September cows to June and worse yet July last year . So I hope they will be more May and June calving this year . Only thing is our March and April cows have all move up to Jan and February. Most of our cows are on a 10 month cycle of calving. We are definitely pulling the bulls this year !