Hey Lou,
Sorry to hear your DH is on crutches. How long is that for? Hoping he'll be better by calving for ya?
Anyway, I just wanted to put a different slant on it (and feel free to ignore me if you want), but if you don't want to give up BF, you could still manage it. I've just gone back to work last week, and I'm able to call in to daycare 2-3 times a day and give DD a quick feed. It's actually quite nice time out for me and I'm guessing you live on the farm and will be coming in for meals etc too? It means she's a bit less demand fed, but I figure routined BF is still better for her than formula.
I'm still up 3-6 times per night too, so I know how hard it is to go to work on such terrible sleep. Perhaps you could put her on formula for the night feeds and get your DH to do those? And then BF her during the day. Bodies are wonderful things, and it could mean that once your DH is back to work, you'd be able to switch back to fully BF because your supply would pick up again. Of course if you are going to be working over calving I can totally understand if you want to remove all other strains on your body, cos calving is hard work!!
But I just thought I'd throw that out there for ya too