不同青贮玉米品种对羔羊胃肠道组织形态及发酵参数的影响

Effects of different silage corn cultivars on tissue morphology and fermentation parameters in the gastrointestinal track of lambs

摘要:

【目的】 研究不同品种青贮玉米对羔羊胃肠道组织形态及发酵参数的影响。【方法】 选择体况及体重相近的4月龄湖羊30只，随机分为3组，每组10只，分别饲喂豫青贮23（YQZ组）、屯玉168（TY 组）和龙生1号（LS组）青贮玉米，自由采食，满足试羊维持需要；同时各组饲喂等量相同的精料补充料， 以满足生长需要。正试期60 d后，各组随机选择5只进行屠宰，测定羔羊胃肠道组织形态及发酵参数变化。【结果】 不同品种青贮玉米显著影响肠道pH、氨态氮（NH3-N）和挥发酸（VFA）浓度（P＜0.05）， YQZ组羔羊十二指肠中食糜乙酸（AA）、丙酸（PA）及总酸（TVFA）含量均显著高于其他两组（P＜ 0. 05），结肠中则AA含量显著高于其他两组（P＜0.05）；YQZ组和TY组羔羊瘤胃乳头长度、乳头宽度、十二指肠绒毛长度及盲结肠肌层厚度均显著高于LS组（P＜0.05）。【结论】 不同品种青贮玉米可以不同程度地改变羔羊胃肠道组织形态及发酵参数，且YQZ组青贮玉米更有利于羔羊胃肠道发育。

Abstract:

【Objective】 This study aimed to evaluate the effects of different cultivars of silage corn on the tissue morphology and fermentation parameters in the gastrointestinal track of lambs.【Method】 Thirty four-month-old Hu lambs with similar body conditions and weights were selected and randomly divided into three groups，with each group containing 10 lambs. The groups were fed silage fromthree different corn cultivars：Yusilage 23 （YQZ），Tunyu 168 （TY） and Longsheng 1 （LS）. The lambs were allowed ad libitum access to silage to meet maintenance energy requirements，with growth energy supplied through a concentrate supplement. After 60 days of the trial period，five lambs were randomly selected from each group for slaughter to measure the changes in gastrointestinal tissue morphology and fermentation parameters.【Result】 The results indicated that different cultivars of silage corn had significant effects on the intestinal pH，NH3 -N and VFA concentrations （P＜0. 05）. The contents of acetic acid，propionic acid and total volatile fatty acids in the duodenum of the YQZ group were significantly higher than those of the other two groups（P＜0. 05），while the contents of acetic acid in the colon were significantly higher than those of the other two groups（P＜0. 05）. The YQZ and TY groups showed significantly greater papilla length，papilla width，villus length of small intestinal and muscle thickness of cecocolon compared to the LS group （P＜0. 05）.【Conclusion】 It can be concluded that different cultivars of silage corn affect gastrointestinal tissue morphology and fermentation characteristics in lambs to varying degrees. Among the cultivars tested，YQZ group silage corn was the most beneficial for the gastrointestinal tract development of lambs