I have 2 brangus heifer calves about a month and a half old. Neither one will take a bottle. Completely refuse and fight like tigers. Tried several days, several times, it ain't happening. They are both eating sweet feed, hay and drinking water out of a bucket. Is there anything, supplement, alfalfa pellets, etc. that I can get some calcium into these heifers where they won't be stunted? I would like to use them as replacement heifers for our herd.