26 month old black beef heifer has a 5 day old calf that she refuses to nurse. I have the cow and calf penned together and the calf frequently attempts to nurse but the new mom refuses to co-operate by kicking. The cow, after repeating the process for 4 days, will readily enter into the squeeze chute and stand quietly while the calf nurses. However, once out of the restraint, she reverts to the previous non mothering ways. Any thoughts?