Intensity of coccidian infection (OPG) was higher in weaners than fatteners and growers (p < 0.05). The top and bottom horizontal lines of boxplots represent the first and third quartiles of the data range, respectively. The medians are shown by middle horizontal lines, and the data range is shown by vertical lines, with outliers plotted as points. The notches of each boxplot are approximate 95% confidence intervals of medians. OPGs are described in log number.