I have had pretty good luck experimenting with turnips. Never noticed the gas issue but maybe that was due to the fact that I never get much below freezing and never saw the wilting? Turnip seed is real cheap, I do some light disking and broadcast in August. Timing seems important where I'm at, it seems to quit growing around mid-Nov in the PNW. I also did some turnips and SS planted late July this year, good timing for turnips, bad for SS but it worked out OK. Strip grazed in October while I stockpiled some of my fescue. Turnips seems to stay good until Dec/Jan at least and cows love to root them up. Looks like its been rototilled afterwards. Again, very temperate here and not often below freezing, just rain and mud.
This is in December, planted too late and seeded too thick, and poorly prepped seedbed.

This is a little better, the next year 2020, kale, canola, and turnips, grazing in Oct.

This year, SS and turnips mixed, planted late July, strip grazed October.

This year turnips and SS. Big bulbs.