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The effects of dietary inclusion of yeast culture (YC) and of gradually increasing proportion of sugar beet molasses [0 (M 0 ) , 100 (M 1 0 0 ) and 200 (M 2 0 0 ) g kg"] in the concentrate mixture on feed intake, live weight gain and carcass characteristics of growing Ayrshire bulls were examined in a 3 x 2 factorial design. Twenty-eight animals with a mean initial hveweight (LW) of 268 kg were used. Molasses replaced a part of concentrate, which was based on a mixture (1:1) of barley and sugar beet pulp. Grass silage was offered ad libitum and the concentrate supplements at the rate of 100 g per LW° 6 on air dry basis. YC (5 g day') was top-dressed on the concentrate. Feed intake was not affected by the treatments but LW gain decreased linearly (P<0.05) with increasing rate of molasses (1.21, 1.16 and 1.09 kg day"; SEM 0.029). As the proportion of molasses increased from 0 to 200 g/kg concentrate the efficiency of feed conversion declined (linear effect P < 0.01) from 6.10 to 6.75 kg D M kg" LW gain. YC had no significant effect either on feed intake (7.26 vs 7.49 kg day") or LW gain (1.14 vs 1.17 kg day"). Yeast interacted with concentrate so that with M 0 LW gain was increased and with M 2 0 0 decreased by YC. The differences in carcass weight and carcass gain reflected a pattern similar to those in LW gain. Dressing proportion and fat grades were not affected by the treatments but carcass quality grade was better in animals receiving YC.

The influence of molasses and yeast culture on the performance of growing bulls on grass silage-based diet