I'm not sure how soon after calving they'll cycle again (Sally will though
)
I wish I could live up to your faith in me Karen

but it seems to be a moveable feast. From our own herd, 5-6 weeks after calving is the earliest they seem to come a-bulling, but if served then they often (nearly always) don't hold. Our average seems to be around 8-10 weeks after calving to come a-bulling. They're much more likely to hold when bulled at this time. We don't have a bull this year, though, and I'm sure they'll cycle sooner if they've a bull with them.
So I would absolutely echo Robert's advice - send them to the bull at about 6 weeks after calving (or watch and use AI if that's your preference.)
On the condition and health over winter, BH says the following:
- Don't give them Crystalyx; they will just put weight on again. Better to give them a mineral drench or bolus. Check with your vet what specific elements they need on top of the salt and yellow Rockies, and drench them or get a bolus for that. For us, it's iodine, copper, cobalt and selenium they need.
- Your ground is too good to get weight off native good-doers! He'd winter them indoors on straw only, but definitely limit their intake of grass somehow.
- Monitor their weight carefully - since they're growing calves inside them it's hard to judge from an actual weight or girth measurement, so find some points about their bodies to monitor - my dairy farming neighbour swears by the fat on the pin bones and vertebrae in the tail head.
- If the weight isn't coming off, be prepared to bring them in on reduced rations. They could well still put on weight, or not lose, even on just good straw, so you may need to try to find some poor hay with very little nutrition in it for them to pick on at with just a flap or two of better stuff night and morning.
Good problems to have though! I've just been thinking about how to manage my Fells this winter; they're horribly overweight after a summer on very rough marshy pasture and I can't see them losing without being restricted
and getting a lot more exercise.