Utilization of apple residue in diets for lambs and milking cows The effect of replacing 0%, 33%, 66% and 100% of the maize meal with apple residue in a growth diet containing 45% roughage for lambs was investigated. The replacement of maize meal by apple residue in the diet resulted in a significant (P < 0,01) decrease in the apparent digestibility of ether extract and a significant (P < 0,01) increase in the apparent digestibility of nitrogen-free extract. No significant (P > 0,05) differences occurred among the various treatments for digestible energy values. However, a significant reduction in daily live mass gain (P < 0,05) and efficiency of feed conversion to carcass mass (P < 0,01) of the lambs was observed when maize meal was totally replaced by apple residue. The most effective level of apple residue inclusion in growth diets under these conditions for lambs is about 28%. The influence of replacing 0%, 33%, 66% and 100% of the maize meal with apple residue in a diet containing 60% roughage for milking cows was also investigated. No significant differences (P> 0,05) in terms of daily live mass gain, milk production and composition of milk occurred between the various treatments.