My calves have all been fairly small and came unassisted. You could any color under the moon to be honest lol. I had 2 red calves out of black cows last year, one a baldy and one solid red. This year I have 3 black ones. But I think its fun that way...kinda like Christmas you never know what color your gonna get (lol) (lol)
I have had four so far and one I had this morning looked red (it was dark and raining hard). I thought I was just seeing things. This is good to know. The others have had alot of white on them (granted mamas are all blaze face). Two have been around 70lbs and 2 have been bigger (90 plus). The two big ones came from mamas who consistantly have big calves.
I had four calves out of 5 to 7 year old cows and never pulled a calf out of any of them in the past.One calved buy her self . I pulled the other three ,they were 105 to 125 lbs. not a show steer in the group , all went to the sale barn.