复合化学处理玉米秸秆对肉羊生长性能及瘤胃发酵参数的影响

The effect of compound chemical treatment of corn straw on the growth performance and rumen fermentation parameters of meat sheep

文章旨在研究复合化学处理玉米秸秆对肉羊生长性能及瘤胃发酵参数的影响。试验将120头3月龄初重相近(19.86±1.25kg)的健康湖羊随机分为4组,每组3个重复,每个重复10头。对照组饲喂基础日粮(采用玉米秸秆作为粗饲料),其余3组分别采用碱化(3%氢氧化钙)、氨化(3%尿素)、碱化+氨化(3%氢氧化钙+3%尿素)对玉米秸秆进行预处理,并记为碱化组、氨化组、复合化学处理组。各组肉羊采用全混合日粮(TMR)技术,预饲期10d,正试期90d。结果显示:(1)与对照组相比,氨化组肉羊平均日增重显著提高9.83%(P<0.05),料重比显著降低8.04%(P<0.05);复合化学处理组肉羊平均日增重显著提高11.05%(P<0.05),料重比显著降低9.06%(P<0.05)。(2)与对照组相比,碱化组肉羊瘤胃液中pH值、总挥发性脂肪酸、乙酸含量显著提高(P<0.05);氨化组肉羊瘤胃液中氨态氮、总挥发性脂肪酸、乙酸含量显著提高(P<0.05);复合化学处理组肉羊瘤胃液中pH值、氨态氮、总挥发性脂肪酸、乙酸含量显著提高(P<0.05)。结论 :饲喂不同化学处理后的玉米秸秆,均提高了肉羊的生长性能,改善了瘤胃发酵参数。综合来看,碱化+氨化的复合化学处理方式效果更佳。

The experiment aims to investigate the effects of compound chemical treatment of corn straw on the growth performance and rumen fermentation parameters of meat sheep.120 healthy Hu sheep of similar initial weight(19.86±1.25kg)at the age of 3 months were selected and randomly divided into 4 groups,with 3 replicates in each group and 10 sheep in each replicate.The control group was fed with basic diet(using corn stover as roughage),while the other three groups were pretreated with corn stover using alkalization(3%calcium hydroxide),ammonification(3%urea),and alkalization+ammonification(3%calcium hydroxide+3%urea),and were recorded as alkalization group,ammonification group,and compound chemical treatment group.Each group of sheep was fed a fully mixed diet(TMR)technique,with a pre trial period of 10 days and a trial period of 90 days.Result:(1)Compared with the control group,the ammonification group increased the average daily weight gain of meat sheep by 9.83%(P<0.05),and the feed to weight ratio decreased by 8.04%(P<0.05);The average daily weight gain of meat sheep in the composite chemical treatment group increased by 11.05%(P<0.05),and the feed to weight ratio decreased by 9.06%(P<0.05).(2)Compared with the control group,the pH value,total volatile fatty acids,and acetic acid content in the rumen fluid of the alkaline group significantly increased(P<0.05);The content of ammonia nitrogen,total volatile fatty acids,and acetic acid in the rumen fluid of sheep in the ammonification group was significantly increased(P<0.05);The pH value,ammonia nitrogen,total volatile fatty acids,and acetic acid content in the rumen fluid of the composite chemical treatment group significantly increased(P<0.05).Conclusion:Feeding corn stover with different chemical treatments improved the growth performance of meat sheep and improved rumen fermentation parameters.Overall,the combined chemical treatment method of alkalization and ammonification is more effective.