With this trial we have tested the effects of structural and chemical composition of neutral detergent fibre (NDF) of the diet on lamb fatty acid composition of meat and subcutaneous fat. Twenty lambs, were fed complete diets with low starch and similar NDF content of different origin (ground alfalfa or soybean hulls). Animal performance and product quality were not affected by treatments. Rumen pH increased and parakeratosis intensity decreased with the level of alfalfa in the diet. Increasing the alfalfa proportion in the diet decreased t10–18:1 (P = .023), increased t11–18:1 (P = .003) and decreased the t10/t11 ratio according to a quadratic pattern (P = .020). Chemical composition and structure of the diet's fibrous fraction influenced the BI pattern of the final product. Forty percent of alfalfa in diet reduced the severity of t10-shift, but for its full resolution, other factors should be considered including forage particle size and buffering capacity of the diet.

通过该试验，我们测试了饮食中性洗涤剂纤维（NDF）的结构和化学组成对肉和皮下脂肪的羔羊脂肪酸组成的影响。向二十只羔羊饲喂低淀粉，不同来源的类似NDF含量（碎苜蓿或大豆皮）的完全日粮。动物性能和产品质量不受治疗的影响。随着日粮中苜蓿水平的升高，瘤胃的pH值升高，角化不全的强度降低。日粮中苜蓿比例的 增加按照二次模式降低了t 10–18：1（P = .023），增加了t 11–18：1（P  = .003）并降低了t 10 / t 11比率（P = .020）。日粮纤维部分的化学组成和结构影响了最终产品的BI模式。日粮中有40％的苜蓿降低了t 10班轮班的严重性，但要使其完全分解，还应考虑其他因素，包括饲料的粒度和日粮的缓冲能力。