The effect of the feeding system (ad libitum or rationed) on the feed conversion rate and weight gains of Merino ram lambs

摘要: Summary The investigations were conducted on 583 ram lambs of the Polish Merino breed in nine consecutive years (1991-1999) period from 4* to 6* month their lives. Ram - fed and kept separately slatted floor divided into two groups: R system rationed feeding at level recommended by Standard, L libitum with a ration same composition. In months test group consumed more NE average 30.0% (6.59 8.57 MJ) obtained higher daily weight gains experimental 23.3% (223.1 275.1 g) than R. consumption per 1 kg body gain was 4lh month. 5lh it comparable, whereas 6"1 lower aver­ age similar both groups (30.64 30.97 MJ, respectively). Significant interdependencies found between gains. dependencies (r=0.92) (r=0.46). results suggest that is advisable use limited selection terms breeding practice aiming improvement feed conversion rate.