Effects of different silage corn cultivars on tissue morphology and fermentation parameters in the gastrointestinal track of lambs
[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 mor-phology and fermentation parameters.[Result]The results indicated that different cultivars of silage corn had signifi-cant 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 char-acteristics in lambs to varying degrees.Among the cultivars tested,YQZ group silage corn was the most beneficial for the gastrointestinal tract development of lambs.
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