Fritz J O, Moore K J, Jaster E H
Department of Agronomy, University of Kentucky, Lexington 40546.
J Dairy Sci. 1988 Dec;71(12):3345-51. doi: 10.3168/jds.S0022-0302(88)79939-7.
Four nonlactating Holstein cows were fed all-forage diets, consisting of two brown midrib mutant sorghum x sudangrass hybrids (Redlan x Greenleaf and Redlan x Piper) and their normal counterparts, to assess the effects of the brown midrib mutation on the rate and extent of in situ cell wall digestion and on ruminal liquid and particulate turnover rates. The four diets were preserved as hay and coarsely chopped prior to feeding in a 4 x 4 Latin square design. Brown midrib genotypes had lower NDF, acid detergent lignin, and hemicellulose concentrations than did normal genotypes. There was no significant difference between brown midrib and normal diets in the rate of in situ cell wall digestion or in digestion lag time. However, brown midrib diets had greater extent of digestion and greater apparent digestibility than normal diets. There was no difference between genotypes in ruminal liquid or particulate turnover rates. In this experiment, lignin concentration had no effect on the rate of in situ digestion or on the rate of ruminal digesta flow.
选用4头非泌乳期荷斯坦奶牛，给它们饲喂全草料日粮，日粮由两种棕色中脉突变型高粱×苏丹草杂交种（Redlan×Greenleaf和Redlan×Piper）及其正常对照品种组成，以评估棕色中脉突变对原位细胞壁消化的速率和程度以及瘤胃液和颗粒周转率的影响。这四种日粮在饲喂前制成干草并粗切，采用4×4拉丁方设计。棕色中脉基因型的中性洗涤纤维、酸性洗涤木质素和半纤维素浓度低于正常基因型。棕色中脉日粮和正常日粮在原位细胞壁消化速率或消化延迟时间上没有显著差异。然而，棕色中脉日粮比正常日粮具有更高的消化程度和表观消化率。基因型在瘤胃液或颗粒周转率上没有差异。在本试验中，木质素浓度对原位消化速率或瘤胃食糜流动速率没有影响。
