Effects of different processes alfalfa substitute concentrate on growth performance,serum biochemical indices,and rumen fermentation parameters of finishing beef cattle
This experiment was conducted to investigate the effects of alfalfa substitute concentrate on the growth performance,serum biochemical indices,and rumen fermentation parameters of beef cattle.A total of 18 Simmental bulls with similar body weight(405.00±11.22)kg and aged(17±1)months were randomly divided into three groups with six bulls in each group and one cow in each replicate.The control group was fed corn stalk silage(54％)and concentrate(46％).On the basis of the diet of the control group,9％semi-dry alfalfa and alfalfa silage were used to replace the same amount of concentrate in the experiment groups 1 and 2,respectively.The pre-trial period lasted for 15 days and the experimental period lasted for 75 days.The results showed that compared with the control group,the dry matter intake of the experimental group 1 was significantly increased(P＜0.05),and the apparent digestibility of acid detergent fiber and neutral detergent fiber in the experimental groups was significantly higher(P＜0.05).The serum albumin,creatinine,and lipase levels in the experimental group were significantly higher than those in the control group(P＜0.05),and the serum glucose content in the experimental group 2 was significantly higher than that in the control group and the experimental group 1(P＜0.05).Compared with the control,the microbial protein content in the experimental group was significantly decreased(P＜0.05),and the proportion of acetic acid was significantly increased(P＜0.05).The ratio of ethylene and propionic acid in the experimental group 2 was significantly increased(P＜0.05),and the proportion of propionic acid was significantly decreased(P＜0.05).The study indicates that the substitution of alfalfa by different processing and preparation of alfalfa to some concentrates improved the dry matter intake,the apparent digestibility of neutral detergent fiber and acid detergent fiber,and the content of glucose and albumin in the serum,and the health of beef cattle was good,and the effect of 9％semi-dry silage alfalfa substitution of concentrate is better.
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