Description Optimum calf age range is birth to 5 weeks, by then the calf is eating sufficient concentrate. Improve liveweight gain by maintaining body temperature. Helps sick calves to recover and maintain body temperature. Calf blankets support the immune system during the first few days and prevent diarrhoea problems and other illnesses. Protection from sudden changes in the weather. Avoidance of cold stress in new-born calves. 70cm or 80cm