Negative energy balance and its implication on productive and reproductive performance of early lactating dairy cows: review paper

Abstract

ABSTRACT In Ethiopia, the dairy cows’ major feed resources are natural pasture and crop residues, both of which are nutritionally low and do not even satisfy the maintenance requirement. Consequently, dairy productivity per head is low in the country. This paper reviews the existing knowledge of negative energy balance (NEB) and summarizes its implication on production and reproduction parameters, as well as the monitoring tools as a means of intervention in minimizing the effect on dairy cows. The presence of NEB in late gestation and early lactation of dairy cows could contribute to both short and long-term negative effects on production and reproduction ability. Lower body condition, reduced milk production, a change in the milk fat to protein ratio, an increasing incidence of health problems, a late time to become estrus, delayed ovarian cycle, and a lower conception rate are the common implications. Through the knowledge created so far, it can be concluded that NEB is almost a common phenomenon in transitional high milking dairy animals, but there is a possibility to shorten its persistence through strategic supplementation using the NEB monitoring tools.