Effect of sealing on the feed out face of trench silos on the performance of confined calves

ABSTRACT This study aimed to evaluate the productive performance, dry matter intake, apparent digestibility and ingestive behavior of feedlot calves fed corn silage from the feed out face of trench silos with different types of sealing. The animals were divided into three treatments with four repetitions: Conventional seal - double-sided polyethylene of 110µm thickness; Double-sided seal - double-sided polyethylene of 200µm thickness; and Double seal - composed of double face polyethylene with a thickness of 80µm superimposed on a polyamide translucent vacuum film with a thickness of 20µm. The use of double face sealing provided 12.63% increase in average daily gain and improved food conversion by 0.62 percentage points. The apparent digestibility of the diet with double-face sealing system silage was 4.30% higher than the diet with double-face sealing silage and 11.00% higher than the diet with conventional sealing silage. It is recommended to use the double face sealing with 200µm polyethylene and double face sealing with 80µm thick polyethylene on top of a 20µm thick polyamide translucent vacuum film.

摘要 本研究旨在评估饲喂不同密封方式壕沟青贮窖取料面玉米青贮的舍饲犊牛的生产性能、干物质采食量（dry matter intake）、表观消化率（apparent digestibility）及采食行为（ingestive behavior）。试验将试验犊牛分为3个处理组，每组设置4个重复：①常规密封组：采用厚度110μm的双面聚乙烯膜密封；②双面密封组：采用厚度200μm的双面聚乙烯膜密封；③复合密封组：由厚度80μm的双面聚乙烯膜与厚度20μm的半透明聚酰胺真空膜叠合而成。采用双面密封可使犊牛平均日增重（average daily gain）提升12.63%，饲料转化率（food conversion）改善0.62个百分点。采用双面密封系统青贮的日粮表观消化率较双面密封青贮日粮高4.30%，较常规密封青贮日粮高11.00%。本研究推荐采用厚度200μm的双面聚乙烯膜进行双面密封，以及采用厚度80μm的双面聚乙烯膜覆于厚度20μm的半透明聚酰胺真空膜之上的复合密封方式。