CONSERVATION OF PRESSED BREWERS GRAINS AN D THEIR UTILIZATION IN CATTLE FEEDING - 3 - USE OF PRESSED BREWERS ENSILED GRAINS OR BREWERS DRIED GRAINS IN FATTENING BULLS

In two cattle fattening experiments pressed brewers ensiled grains a I d brewers dried grains, respectively were compared with conventional p rotein concentrates. In both experiments corn silage was fed ad libitu m. In trial 1 twenty-four Simmental bulls were fed with pressed brewer s ensiled grains (BTS) or soybean meal (SOJA) as a protein concentrate beginning at an initial live weight of 350 kg. Fifteen bulls were use d in trial 2 using a 3 x 3 latin square design to compare protein sour ces BTS or brewers dried grains (BTT) and a conventional protein conce ntrate (PKF) consisting of each 25% soybean meal, rapeseed meal, faba beans and peas. Each period consisted of a 7 day adjustment period fol lowed by 49 days of evaluation. In both experiments feed and energy in take was lower in the BTS group. But differences were significant only in experiment 2 because of high standard deviations in experiment 1. Energy intake in experiment 2 was 102,9 (PKF), 102,6 (BTT) and 93,5 (B TS) MJ ME per day. In both experiments daily weight gains were lower i n the BTS group, but, again, differences were not significant (P = 0,1 0, P = 0,12) because of high standard deviations. In experiment 1 dail y weight gains were 1192 g (SOJA) and 1054 g (BTS). In experiment 2 th e daily gains decreased from 1355 (PKF) to 1274 (BTT) and 1103 g (BTS) . Comparable results were determined for feed conversion. In experimen t 1 significantly lower dressing percentages were found for group BTS.