You crazy lot!!
Years ago when we had dairy cows, the calves were obviously removed from their Mums after they were several days old (we then raised them on milk feed and later weaner pellets, so I do know what you are going through!), but we had one sweet elderly Friesian cow who just loved calves, so once she had her own calf at foot we would bring her into a stable with her calf and give the new babies to her once they left their Mommas. They stayed in over the nights but spent the days out in her own private field. At one time she had 10 babies trailing around after her, bless her, and they all got some milk to drink, plus loads of washing and loving from their adoptive Mum. (we of course helped by supplimenting their feed at nights when they were all in) She was a girl in a million!!