Núñez Muñoz M, Ortega Cerrilla E
Departamento de Nutrición Animal, Instituto Nacional de la Nutrición Salvador Zubirán, México D.F.
Arch Latinoam Nutr. 1987 Jun;37(2):388-94.
An experiment was conducted to evaluate the effectiveness of urea, ammonia sulphate or calcium hydroxide, in improving the nutritive value of wheat straw for ruminant feeding. Wheat straw was treated with each of three solutions (w/w) containing: 5% urea - 50% H2O (5U); 2% urea - 2% CaOH - 50% H2O (2U), or 5% ammonia sulphate - 2% CaOH - 50% H2O (5S). The treated straw was then ensiled in triplicate in sealed polyethylene bags for 30 days at ambient temperature (15-22 degrees C), except for the untreated straw, which was used as control (T). All treatments were then subjected to the following determinations: pH, moisture, crude protein, ammonia N, ashes, cellular walls, hemicellulose, cellulose, lignin, silica, gross energy, and dry matter in vitro digestibility. The pH value of the 5U treatment was higher (p less than 0.01) than that of 2U and 5S, and the moisture percentage increased in all treated straws, as compared to the control. Both crude protein and ammonia N contents were higher in the 5U treated straws (14.66; 0.6%), 2U (6.41; 75%), 5S (9.54; 94%) in comparison with T (2.63; 50%). The ash percentage increased significantly in 2U and 5S (p less than 0.01) in relation to T and 5U, and the cellular wall content decreased in the 5U, 2U and 5S treated straws, as did cellulose. Gross energy values were higher in the treated straws, and the dry matter per cent digestibility was also higher, although not in a significant degree (p less then 0.01) in the 5% urea-treated straw (45.03) than in 2U (42.43), 5S (34.82), and T (42.36).(ABSTRACT TRUNCATED AT 250 WORDS)
进行了一项实验，以评估尿素、硫酸铵或氢氧化钙在提高反刍动物饲料用小麦秸秆营养价值方面的有效性。用三种溶液（重量/重量）分别处理小麦秸秆，这三种溶液分别含有：5%尿素-50%水（5U）；2%尿素-2%氢氧化钙-50%水（2U），或5%硫酸铵-2%氢氧化钙-50%水（5S）。然后将处理过的秸秆一式三份装入密封的聚乙烯袋中，在环境温度（15-22摄氏度）下青贮30天，未处理的秸秆用作对照（T）。然后对所有处理进行以下测定：pH值、水分、粗蛋白、氨态氮、灰分、细胞壁、半纤维素、纤维素、木质素、二氧化硅、总能和体外干物质消化率。5U处理的pH值高于2U和5S（p<0.01），与对照相比，所有处理过的秸秆的水分百分比均有所增加。与T（2.63；50%）相比，5U处理的秸秆（14.66；0.6%）、2U（6.41；75%）、5S（9.54；94%）中的粗蛋白和氨态氮含量均较高。与T和5U相比，2U和5S中的灰分百分比显著增加（p<0.01），5U、2U和5S处理的秸秆中的细胞壁含量以及纤维素含量均降低。处理过的秸秆的总能值较高，干物质消化率百分比也较高，尽管5%尿素处理的秸秆（45.03）的干物质消化率百分比与2U（42.43）、5S（34.82）和T（42.36）相比没有显著差异（p<0.01）。（摘要截于250字）
