This manual is a reprint of the same subject published in 1996 under the title “Early Weaning to Breeding Vaccine: Management of calves at weaning. Practice. ” It is, in any event, a replay and purpose is reflected in the latter part of the title has changed from: Practical recommendations for a much more extensive: Manual for decision-making and implementation of technology. This amendment seeks to respond to changes occurred in the demand for information. It has gone from a productivist approach to market orientation and the amendments customer focus activity in search of total quality. At critical points of technique, related to risk analysis (HACCP), identifies the contributions that the practice does or can do toward that goal.