Forty healthy Simmental crossbred beef cattle with a body weight of about 460 kg were randomly assigned into two groups.The control group was fed with basal diet,and the experimental group was fed with 20 g/(d·head)complex enzymes additionally.The total period was 67 days,including a 7-d pre-feeding and a 60-d experiment period.The feed intake was accurately recorded daily and weighed.The body weight was measured before the morning feeding at the first and the last day of the experiment.The rumen fluid was collected right after weighing and before the morning feeding at the last day of the experiment to determine rumen fermentation parameters and enzyme activities.The results showed that:compared to the control group,the average daily gain and the feed efficiency of the experiment group was significantly greater(P＜0.05).The apparent digestibility of dry matter,starch,neutral detergent fiber and acid detergent fiber was significantly greater of the experiment group than that of the control group(P＜0.05).Compared to the control group,the content of propionic acid and the activity of cellulase,xylanase and β-glucanase of rumen fluid was significantly increased(P＜0.05).The concentration of rumen NH3-N and the ratio of acetic acid to propionic acid was significantly decreased with the addition of complex enzymes(P＜0.05).It concludes that the complex enzymes can improve the rumen enzyme activity,the nutrients apparent digestibility and then improve the growth performance of fattening beef cattle.
Complex enzymesFattening Beef cattleApparent nutrient digestibilityRumen fermentationAverage daily gain
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