马铃薯秧青贮对肉羊生长性能、瘤胃发酵参数及血清生化指标的影响

Effects of potato seedling silage on growth performance,rumen fermentation parameters,and serum biochemical indexes of mutton sheep

试验旨在研究马铃薯秧青贮对肉羊生长性能、瘤胃发酵参数及血清生化指标的影响。试验选择健康且体重相近的肉羊48只,随机分为4组,每组3个重复,每个重复4只肉羊。对照组肉羊饲喂全株玉米青贮,试验Ⅰ组、Ⅱ组、Ⅲ组分别使用25%、50%、100%的马铃薯秧青贮替代全株玉米青贮。预试期1 w,正式试验期60 d。结果显示,试验Ⅱ组的末重和平均日增重显著高于对照组(P<0.05),料重比显著低于对照组(P<0.05)。试验Ⅰ组和Ⅱ组的瘤胃乙酸浓度显著高于对照组和试验Ⅲ组(P<0.05),试验Ⅱ组的总挥发性脂肪酸浓度显著高于对照组和试验Ⅲ组(P<0.05);试验Ⅱ组的菌体蛋白含量显著高于对照组(P<0.05),氨态氮浓度显著低于对照组和试验Ⅲ组(P<0.05)。试验Ⅱ组肉羊血清胆固醇、低密度脂蛋白胆固醇和尿素氮水平显著低于对照组(P<0.05),试验Ⅰ组和Ⅱ组血清高密度脂蛋白胆固醇水平显著高于对照组和试验Ⅲ组(P<0.05),各试验组血糖水平均显著高于对照组(P<0.05)。研究表明,适量添加马铃薯秧青贮对肉羊的生长性能及瘤胃功能具有促进作用,提升血脂代谢,以铃薯秧青贮替代50%的全株玉米青贮为宜。

The experiment aimed to investigate the effects of potato seedling silage on the growth performance,rumen fermentation parameters,and serum biochemical indexes of mutton sheep.A total of 48 healthy mutton sheep with similar body weight were randomly divided into four groups with three replicates per group and four mutton sheep per replicate.The control group was fed with whole-plant corn silage,while experimental groups Ⅰ,Ⅱ,and Ⅲ used 25%,50%,100% potato seedling silage to replace the whole-plant corn silage,respectively.The pre-feeding period was one week,and the formal experimental period lasted for 60 days.The results showed that the final body weight and average daily weight gain of group Ⅱ were significantly higher than that of the control group(P<0.05),and the feed-to-gain ratio was significantly lower than that of the control group(P<0.05).The ruminal acetic acid in groups Ⅰ and Ⅱ was significantly higher than that in the control group and group Ⅲ(P<0.05),and the concentration of total volatile fatty acids in group Ⅱ was significantly higher than that in the control group and group Ⅲ(P<0.05),the microbial protein content in group Ⅱ was significantly higher than that in the control group(P<0.05),and the concentration of ammonium nitrogen was significantly lower than that in the control group and group Ⅲ(P<0.05).The levels of serum cholesterol,low-density lipoprotein cholesterol,and urea nitrogen in group Ⅱ were significantly lower than those in the control group(P<0.05),and the level of serum high-density lipoprotein cholesterol in groups Ⅰ and Ⅱ was significantly higher than that in the control group and group Ⅲ(P<0.05).The serum glucose level in all experimental groups was significantly higher than that in the control group(P<0.05).The study indicates that the appropriate addition of potato seedling silage has a promoting effect on the growth performance and rumen fermentation of mutton sheep,and enhances lipid metabolism.It is advisable to replace 50%of the whole-plant corn silage with potato seedling silage.