Effects of Fermented Concentrate on Growth Performance,Serum Biochemical Indices and Nutrient Apparent Digestibility of Angus Steers
This experiment was conducted to investigate the effects of fermented concentrate on growth per-formance,serum biochemical indices and nutrient apparent digestibility of Angus steers.Forty-five healthy An-gus steers with similar body weight of(637.75±50.99)kg were randomly divided into 3 groups with 15 steers in each group.Cattle in the control group(CON group)were fed a basal diet,and those in the experimental groups were fed 15％(F15 group)and 30％(F30 group)fermented concentrate instead of the concentrate in the basal diet,respectively.The pre-trial period lasted for 14 days,and the experimental period lasted for 60 days.The results showed as follows:1)compared with the basal concentrate,the crude ash(Ash)content in fermented concentrate was significantly increased(P＜0.05),and the neutral detergent fiber(NDF)content had a tendency to be decreased(P=0.06).The activities of acid protease and cellulase in fermented concen-trate were significantly higher than those before fermentation,but the amylase activity had no significant change.2)From days 1 to 30,compared with CON group and F15 group,the average daily gain(ADG)of steers in F30 group was significantly increased(P＜0.05),the dry matter intake(DMI)showed an increasing trend(P=0.09),and the ratio of feed to gain(F/G)was significantly decreased(P＜0.05).3)Compared with CON group and F15 group,the serum aspartate transaminase(AST)activity of steers in F30 group was significantly decreased(P＜0.05),and the serum urea content had a decreasing trend(P=0.05).4)Com-pared with CON group and F15 group,the crude protein(CP)apparent digestibility of steers in F30 group tended to be increased(P=0.06).In conclusion,the replacement of basal concentrate with fermented concen-trate at 30％can improve the growth performance of Angus steers in the early fattening stage,and has the po-tential to improve their protein digestion and absorption.[Chinese Journal of Animal Nutrition,2025,37(4):2431-2440]
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