I realize I have brought up this "cows not calving" several times. I suppose this problem has just stunned me; I feel like a deer in headlights. This is an issue that I never heard anyone else talk about in the past, so I never expected it. The opposite issue is what I've heard of: keeping the neighbor's bull from getting in and breeding your cows or your heifers too early, or the herd bull breeding the young heifer calves too soon is usually the issue. The problem is typically, "how do we hold them back until it's time, not "how do we make them breed."
I'm not doing this for a living, or even depending on it in any way for income, although any extra income is nice, so I'm sure that is why I haven't acted with more urgency. I suppose I just hope it will be better the next time. For example, according to when I put the bull with them the first time, they could have calved in September. Instead, they strung out from September to March.
Still, if they had bred back within reason, the majority could have all calved by December the next time; I could live with that assuming they would then breed back on time. Instead, the next round they were strung out from August until May. So, I let that go because I've been told "heifers sometimes have trouble breeding back." This time, with the addition of 3 new heifers, I should have 12 calves by now, instead, I have 4.
When I first posed the issue on the forum, I hoped it might be something simple that I have overlooked, or that it might be a small list of things, after all, I'd never heard of anything like this before. I didn't realize it could be a billion possibilities: nutrition, mineral, infertility, cysts, trich, bull with bent penis, and the list goes on.
Of all the problems I considered and could have imagined, I never thought of this one. I assumed I would have unexplained dead cows; I assumed I would have to bring in a calf in January at the point of being frozen and have to baby it until it got well; I assumed I would lose calves at birth and have cows experiencing trouble giving birth at the most inconvenient times, but I never thought I would have a herd that wouldn't breed in a reasonable time period. I don't recall anything putting a damper on a cow and bull's sex drive when I was younger.
Anyway, I am changing bulls, and if this group of cows doesn't calve in a short while, I'll sell and replace them. I'll try not to bring this specific topic up again.