Sharing can be whatever the two or more parties agree on. I grew up on a ranch with shared arrangements with other relatives that also were ranchers. It was great because one year the drought in Texas brought hardships and cattle prices were low and hay was high so one of my great uncles shipped his best pregnant brood cows up to our irrigated Colorado ranch. We culled to make room and once weaned, we kept most of the calves that paid for feed and hauling and some profit and he then came up and hauled the brood cows and a few heifers back to Texas. He was able to keep his registered brood cows and a few replacement heifers this way and better than taking a big loss feeding them. A small profit was better than a loss. Some years we traded hay for cattle culled by other relatives that didn't have the high yield hay producing capabilities we had.
Living in the mountain of Eastern Oregon many years ago by myself, I ran several head of steers on an allotment in trade for my labor keeping an eye on a rancher's herd and repairing range fence. I traded a good friend, free pasture for the use of her cow horse. She had more horses than pasture. It was a win-win for both because all I was out was the cost of buying day-old half breed beef/dairy calves and the cost of keeping dairy goats for milk to feed them so the following fall I had a small investment, but a lot of work in 20 or so head of steers that brought a nice price from the feedlot buyers.
Trades can be a win win for both parties, but I would suggest penciling it out.