粗饲料对肉牛生长性能、瘤胃发酵参数及血清抗氧化指标的影响OA

To investigate the effects of different types of roughage on growth performance,rumen fermentation parameters and serum antioxidant indices in beef cattle,thirty-six 7-month-old Simmental cattle were randomly divided into 3 groups using a random number table method,with 12 cattle per group and 4 replicates per group.All cattle were fed a diet with a concentrate-to-roughage ratio of 7:3,and the roughage sources were corn silage(group Ⅰ),dried millet straw(group Ⅱ)and distiller's grains(group Ⅲ),respectively.Growth indices including average daily gain,rumen fermentation parameters such as pH and ammonia nitrogen,as well as serum antioxidant indices like superoxide dismutase were determined after a 6-month feeding period.The results showed that compared with Group Ⅰ and group Ⅱ,cattle in group Ⅲ exhibited significantly increased final body weight,average daily feed intake and average daily gain,and a significantly decreased feed-to-gain ratio(P<0.05).Meanwhile,the concentrations of propionic acid and total volatile fatty acids in rumen fluid were notably elevated(P<0.05).Additionally,the total antioxidant capacity in jugular venous serum was markedly enhanced,while the malondialdehyde content was significantly reduced(P<0.05).In conclusion,under the conditions of this experiment,using distiller's grains as the roughage source for beef cattle resulted in superior fattening performance,and exerted more favorable regulatory effects on the body's antioxidant capacity and rumen fermentation status,compared with corn silage and dried millet straw.