THE EFFECTS OF DIFFERENT-ENERGY-LEVEL RATIONS ON FATTENING PERFORMANCE SOME SLAUGHTER AND CARCASS CHARACTERISTICS OF HOLSTEIN BULLS, FATTENED AT SEMI-CONFINEMENT BARN IN WINTER

The animals at the each group consumed ad libitum concentrate feed, containing an energy level of 600, 650, 700 Starch Equivalent and 1 kg of straw was given daily per animal.

The average daily live-weight gain, feed efficiencies, the dressing percentage of cold carcass and kidney-pelvis-cavity fat weight of the groups were 1190 g, 6.91 kg/d, 55.4 %, 3.26 kg; 1257 g, 6.67 kg/d, 57.9 %. 4.64 kg and 1244 g, 6.67 kg/d, 57.7 % 3.90 kg respectively. Keywords : Holstein bulls; ad libitum; fattening performance;the dressing percentage of cold carcass