Calves raised during the heat of summer have reduced growth, increased disease incidence, and higher mortality rates compared with those raised in temperate environments or neutral thermal conditions. The reduced average daily weight gain observed in the summer can be partially attributed to heat stress. In a new report published ahead of the February 2022 issue of the Journal of Dairy Science, scientists from the University of Georgia (Athens, GA, U.S.) investigated the effects of rate and frequency of milk replacer feeding on performance, emptying of the abomasum (one of the bovine forestomachs), and nutrient digestibility among young calves during summer and winter in the warm environment of the southeastern United States.